E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rating: Thread Rating: 2 votes, 5.00 average. Display Modes
Old 12-09-2013, 10:51 AM   #1
Dronshaw
Registered User
 
Join Date: Aug 2013
Location: Missouri
Posts: 35
My Ride: Bmw 325i
Enginge temp OK, no heat at all

It's been getting pretty cold and usually I don't have to drive my car much, as I can walk to school. Unfortunately, I got in my 2002 325i last night and while driving I noticed the engine temperature needle was dead center, meanwhile the air blowing from my car was extremely cold. I had the heat set to 91F and it was still blowing, what felt like, AC air.

I have read thermostat failure is usually an issue when the engine temp isn't getting to where it should be, but this didn't seem like the case and I'd like to self-repair this when I get back to my hometown and have access to tools + a garage
Dronshaw is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 12-09-2013, 10:59 AM   #2
Mango
e46mango.com
 
Mango's Avatar
 
Join Date: Mar 2006
Location: Southern California
Posts: 26,192
My Ride: Lexus
sounds like the cooling system needs full maintenance.
Mango is offline   Reply With Quote
Old 12-09-2013, 11:01 AM   #3
Dronshaw
Registered User
 
Join Date: Aug 2013
Location: Missouri
Posts: 35
My Ride: Bmw 325i
Is there anything more specific you may *think* could be the problem? The AC worked fine during the hot summer months and I thought the heat was working a month or so ago (of course it was a lot warmer out).

Thanks
Dronshaw is offline   Reply With Quote
Old 12-09-2013, 11:02 AM   #4
jfoj
OEM ///Member
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,858
My Ride: 330CiC, M5, X5, E93
Low coolant could be the first concern. Check the sensor in the lower radiator hose, if it is wet at all around the switch or on the lower engine cover the O-ring for the lower radiator outlet temp sensor is leaking.

Air in the system is the next issue, but this kind of goes along with low coolant.

Center dash vent not on the 3 red dots.

Then read the 3rd link below in my signature. Note that the temp gauge is buffered and it is not accurate at all.

Be very careful if you top off the coolant level. BMW states the coolant should be checked at 68F. If you top off the coolant when cold, set it to the minimum level otherwise you will be back here in a few days with a split expansion tank.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Old 12-09-2013, 11:03 AM   #5
Dronshaw
Registered User
 
Join Date: Aug 2013
Location: Missouri
Posts: 35
My Ride: Bmw 325i
Made sure to have 3 red dots, didn't want to make THAT stupid of a mistake. Will check others, thanks
Dronshaw is offline   Reply With Quote
Old 12-09-2013, 12:49 PM   #6
dslboomer
Registered User
 
Join Date: Jul 2007
Location: Show-me state
Posts: 695
My Ride: 2001 BMW 330I
Disappointing responses.

Check this heater control valve.
http://forum.e46fanatics.com/showthread.php?t=617301


If it is mine, I will try to repair it first before buying a new valve.
This is not exact same valve, but it gives you an idea how to repair it.
Usual failure mode is that the plunger's (pin) surface gets corroded and stuck.

http://www.pelicanparts.com/bmw/tech...e-Cleaning.htm

Last edited by dslboomer; 12-10-2013 at 02:00 AM.
dslboomer is offline   Reply With Quote
Old 12-09-2013, 12:54 PM   #7
dalefj
Registered User
 
Join Date: May 2013
Location: Boston
Posts: 56
My Ride: 2003 330Ci
^I'm with dslboomer. The heater control valve is a part that is known to give out on occasion. I just had a similar problem but the reverse (no cold air, thankfully summer was over haha). I just bought a cheap valve off of someone who was parting out, threw it in and vualah. Check your valve out and see what type of condition it is in.
dalefj is offline   Reply With Quote
Old 12-09-2013, 01:03 PM   #8
Mango
e46mango.com
 
Mango's Avatar
 
Join Date: Mar 2006
Location: Southern California
Posts: 26,192
My Ride: Lexus
regardless of whether or not its the valve, the entire cooling system needs to be replaced. no amount of brand new heater valves in the world will matter if your car has air pockets or no coolant at all flowing through the core
Mango is offline   Reply With Quote
Old 12-09-2013, 02:07 PM   #9
jfoj
OEM ///Member
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,858
My Ride: 330CiC, M5, X5, E93
I find more heater problems due to low coolant and air pockets than anything else.

Not sure how you plan on checking or determining if the heater control valve is a problem until you verify the engine coolant level, engine coolant temps and check for air in the system and purge air if there is any.

Then after all of that first round basic troubleshooting, then the OP can come back and say everything it fine, then you move on to things like heater control valves, water pumps that are broken/cracked/spinning or determine if there is a hose or connection that is blocked. Have not seen a lot of blocked passages on these cars, but have seen it on plenty of others. But if the cooling system has not been reasonably maintained in this car, green coolant or something else all bets are off.

Still plenty of other possible problems, but with anything, rule out the basics first.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Old 12-09-2013, 06:18 PM   #10
dslboomer
Registered User
 
Join Date: Jul 2007
Location: Show-me state
Posts: 695
My Ride: 2001 BMW 330I
Quote:
Originally Posted by Mango View Post
regardless of whether or not its the valve, the entire cooling system needs to be replaced. no amount of brand new heater valves in the world will matter if your car has air pockets or no coolant at all flowing through the core
Here, you prove it again that you don't have any diagnostic knowledge or skill.
Let me say it again: you are a mere part changer.

If there is air pocket in the system, first symptom will be overheat.
If coolant is low, there will be warning provided his/her coolant level sensor is working.

No amount of new cooling parts will fix the no heat problem in the cabin if the heater valve is bad.

Which is the right order for diagnostic and repair?
1. Spend about $1,000 on cooling system parts and a couple of days of work, but find the heater valve is defective.
2. Spend a couple of hours inspecting the heater valve, but it is working ok. So, go to the next possible cause.

Last edited by dslboomer; 12-09-2013 at 06:19 PM.
dslboomer is offline   Reply With Quote
Old 12-09-2013, 06:28 PM   #11
Mango
e46mango.com
 
Mango's Avatar
 
Join Date: Mar 2006
Location: Southern California
Posts: 26,192
My Ride: Lexus
Quote:
Originally Posted by dslboomer View Post
Here, you prove it again that you don't have any diagnostic knowledge or skill.
Let me say it again: you are a mere part changer.

If there is air pocket in the system, first symptom will be overheat.
If coolant is low, there will be warning provided his/her coolant level sensor is working.

No amount of new cooling parts will fix the no heat problem in the cabin if the heater valve is bad.

Which is the right order for diagnostic and repair?
1. Spend about $1,000 on cooling system parts and a couple of days of work, but find the heater valve is defective.
2. Spend a couple of hours inspecting the heater valve, but it is working ok. So, go to the next possible cause.
My friend has a 330ci that he drove an entire year without heat (I test drove and personally verified the complaint) but without overheating. I bled the system and magically he had heat. We later replaced the cooling system.

Further, cooling parts are not $1,000. A complete system is $500. Is that too rich for your blood in the context of owning a german luxury car?

If you happen to drive a BMW doing just enough to get by, that's your business for your car.

That's a low standard though and goes against the idea of being an e46 fanatic. It also shows you can't afford to both maintain and own your car properly. Generally this shows someone just bought it for the badge and tries to show off at car meets held in Walmart parking lots.
Mango is offline   Reply With Quote
Old 12-09-2013, 06:43 PM   #12
dslboomer
Registered User
 
Join Date: Jul 2007
Location: Show-me state
Posts: 695
My Ride: 2001 BMW 330I
Quote:
Originally Posted by Mango View Post
My friend has a 330ci that he drove an entire year without heat (I test drove and personally verified the complaint) but without overheating. I bled the system and magically he had heat. We later replaced the cooling system.

Further, cooling parts are not $1,000. A complete system is $500. Is that too rich for your blood in the context of owning a german luxury car?

If you happen to drive a BMW doing just enough to get by, that's your business for your car.

That's a low standard though and goes against the idea of being an e46 fanatic. It also shows you can't afford to both maintain and own your car properly. Generally this shows someone just bought it for the badge and tries to show off at car meets held in Walmart parking lots.
You did not answer my question.
Which is the proper way to diagnosis?
Throw money around without knowing what is the cause?

What is a fanatic got to do with how much you spend on your car?
That's you who is trying to show off.

What do you know about me assuming I can't not afford to maintain my car properly? Contrary to your thinking, my BMW was purchased brand new not like you who bought an used one.

Last edited by dslboomer; 12-09-2013 at 08:05 PM.
dslboomer is offline   Reply With Quote
Old 12-09-2013, 07:01 PM   #13
330i ZHP
Registered User
 
330i ZHP's Avatar
 
Join Date: Mar 2005
Location: Washington, DC
Posts: 21,905
My Ride: have 5 doors and FI
Send a message via AIM to 330i ZHP Send a message via Yahoo to 330i ZHP
years ago my temp issue was fixed by a new thermostat - it was stuck open
__________________
/_________\
O==[][]==O
330i ZHP is offline   Reply With Quote
Old 12-09-2013, 07:02 PM   #14
330i ZHP
Registered User
 
330i ZHP's Avatar
 
Join Date: Mar 2005
Location: Washington, DC
Posts: 21,905
My Ride: have 5 doors and FI
Send a message via AIM to 330i ZHP Send a message via Yahoo to 330i ZHP
btw - mango is correct in doing maintenance, but his approach can be seen as excessive
__________________
/_________\
O==[][]==O
330i ZHP is offline   Reply With Quote
Old 12-10-2013, 04:12 AM   #15
shanneba
Registered User
 
Join Date: May 2008
Location: Indiana
Posts: 2,180
My Ride: 2003 330Ci
Quote:
Originally Posted by Dronshaw View Post
It's been getting pretty cold and usually I don't have to drive my car much, as I can walk to school. Unfortunately, I got in my 2002 325i last night and while driving I noticed the engine temperature needle was dead center, meanwhile the air blowing from my car was extremely cold. I had the heat set to 91F and it was still blowing, what felt like, AC air.
What does the outside air temperature read on the dash?
If it shows 120F the Heat/AC system may just try to pull in what it thinks is hot outside air to warm the car. The sensor is located on the bottom drivers side in front of the front wheel and many times is ripped off by road debris. Search for a thread titled Ambient Temperature sensor or something like that for more info.
__________________
Join BMWCCA
Discounts on new and CPO cars.
Most Dealers offer a parts discount, BMP Design 10% off
shanneba is offline   Reply With Quote
Old 12-10-2013, 09:12 AM   #16
Brinkley
Registered User
 
Join Date: Dec 2006
Location: asheville NC
Posts: 1,502
My Ride: 99 328i, 07 z4 3.0
I would check my system for leaks first. This would involve getting under the car, up on jackstands, and seeing what's going on. Looking for coolant drips, residue etc. Remove the undertray and see for yourself. You will probably find coolant underneath the expansion tank area. If you do not want to go mango/buckshot method, then you'll need to inspect your system for leaks. Assuming you find one, replace appropriate parts and rebleed system.
If no leak is found, I'd then move to checking the heater control valve. My money is on a leak which has led to an air - bound heater core. Definitely happened to me too. My expansion tank had the smallest of cracks down the side of it and was very hard to diagnose, which is why I say look for signs of coolant first.
__________________
Brinkley is offline   Reply With Quote
Old 12-10-2013, 09:54 AM   #17
jjp735i
Registered User
 
Join Date: Oct 2012
Location: Pittsburgh
Posts: 205
My Ride: 05 545i & 03 325xi
Quote:
Originally Posted by Mango View Post
sounds like the cooling system needs full maintenance.
why would you make blanket statements like this without even knowing what has been done to the car. For all you know it might have new cooling system on it and just needs bleed out.

This is just the reason I avoid this website due to people like you that think they know everything without all the facts.

It's just like telling someone to replace the engine becasue the oil light came on.

You need to dignose the car correctly before just throwing money at it.
jjp735i is offline   Reply With Quote
Old 12-10-2013, 11:15 AM   #18
Mango
e46mango.com
 
Mango's Avatar
 
Join Date: Mar 2006
Location: Southern California
Posts: 26,192
My Ride: Lexus
Quote:
Originally Posted by jjp735i View Post
why would you make blanket statements like this without even knowing what has been done to the car. For all you know it might have new cooling system on it and just needs bleed out.

This is just the reason I avoid this website due to people like you that think they know everything without all the facts.

It's just like telling someone to replace the engine becasue the oil light came on.

You need to dignose the car correctly before just throwing money at it.
But it's not like telling someone to replace the engine because the oil light came on. We know what causes that problem. A defective sensor which is common on these cars. This is the internet son and we're of a community with 250,000 members. It's not my job to sit there for each and every person to wait for specifics. If there are specifics, they should be in the first post. Otherwise I post the safest information for the general public for which the most people at any given point can benefit from. And that information is this:

Replace the entire cooling system.

Unless you contribute, keep your mouth closed.
Mango is offline   Reply With Quote
Old 12-10-2013, 11:17 AM   #19
Mango
e46mango.com
 
Mango's Avatar
 
Join Date: Mar 2006
Location: Southern California
Posts: 26,192
My Ride: Lexus
Quote:
Originally Posted by 330i ZHP View Post
btw - mango is correct in doing maintenance, but his approach can be seen as excessive
Call it what you wish, but truth is you can't argue with results. Many people subscribe to it and are happy. Check my guide feedback on any guide--just randomly click. It's overwhelmingly good.
Mango is offline   Reply With Quote
Old 12-10-2013, 12:04 PM   #20
dmax
Registered User
 
dmax's Avatar
 
Join Date: Aug 2006
Location: NJ
Posts: 23,702
My Ride: '99 328i 300K miles
Quote:
Originally Posted by jjp735i View Post
why would you make blanket statements like this without even knowing what has been done to the car. For all you know it might have new cooling system on it and just needs bleed out.

This is just the reason I avoid this website due to people like you that think they know everything without all the facts.

It's just like telling someone to replace the engine becasue the oil light came on.

You need to dignose the car correctly before just throwing money at it.
If the cooling system was entirely replaced, the OP would have said that, and depending on how he said it, we'd know if he did it or had someone do it. Based on his post, we know he doesn't understand the system, and it is safer to suggest just replacing the system, then it is to suggest he troubleshoots...and, I'll just say, Mango did his bit. The others, with their 3 red dots, bleeding, etc...did theirs. Mango isn't alone here; fanatics work because together, en masse, we cover all the bases. Mango knows that bleeding and 3 dots are or will be covered, etc.

Anyway, since that night Mango and I spent together in the loving embrace of a beagle named Cindy, we've been, you know, very close. I am his protector...and man, does he need me!

Even good mechanics throw parts at an issue, the best either diagnose really well, or recommend throwing 'all' the parts at it in the interest, ironically, of saving the customer money long term. The odds are very good that once one component in a cooling system fails, the others aren't far behind. Not always, and sometimes finances demand fixing just the one broken item, but there's an economy from efficiency. Opening up the cooling system to replace just the therm, say...at that point, so much of the work is already done, it's a good idea to put on the two hoses, the ET, the WP, and after so many miles, the radiator too.

I still tell my fanatic friends to study diys until they puke, as a way of knowing that they know enough to work on the car. If they only read enough to 'know' what to do, they probably don't. If they study diys and see all the controversies, different methods and suggestions, they'd get sick like I used to. That's the sign they know enough. I know they're not puking...and thus, why Mango's 'do it all' admonishment isn't bad advice at all...if they have the financial wherewithal to do it. If you think I or Mango will go through this diatribe every time, you fail to recognize that this is the 5,000th time we've said either 'do it all' or 'study till you puke.'

It's all here, many, many times over.

Okay...I got to go puke now! brb
__________________
See me in June!
Ha! Ridgehill, Yonkers, June 8, 8 p.m. & Broadway Comedy Club, Sat., June 10, 6 p.m., hosting at the Comedy Cove, Springfield, NJ, June 16 & 17 for Joe DeVito, 9 p.m.
See Facebook for other shows and PM me if you can make one.


Please view this vid so it looks like I'm popular. Please! https://youtu.be/995gLmVEVZk

dmax on Facebook

Mangofy your E46!
dmax is offline   Reply With Quote
Reply

Tags
heat, thermostat

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 07:16 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use