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-   -   Under-heating...??? (http://forum.e46fanatics.com/showthread.php?t=627684)

umermariner 11-25-2008 08:42 AM

Under-heating...???
 
Hello,

About a week ago I noticed that the temp. Gauge in my car was not going to 12 O Clock. The gauge would just move 1/4 instead of 1/2. I checked the coolant, and it was really low (I could not see it). So I added more coolant (without any draining procedure). I was expecting it to take a lot more coolant then it took (maybe an air lock).

However, my baby is still under-heating, and the heater is also not working as good, even if I take it for a 20 mile ride.

I am confused. I thought if there is air trapped, it should over heat.

I will appreciate any help.
Thanks.

vminev 11-25-2008 08:54 AM

Maybe your gauge is not working properly.... :hmm:

umermariner 11-25-2008 08:56 AM

Quote:

Originally Posted by vminev (Post 8957898)
Maybe your gauge is not working properly.... :hmm:

I would think that if the climate control works properly. I set it at 91 now, and it still does not push in as hot air as it used to.

M3GA 11-25-2008 06:36 PM

Check your thermostat!!

mkodama 11-26-2008 04:55 AM

Thermostats in the E46 are designed to fail in the open positions. It won't light up the SES light on your dash but it will give a code. They aren't too expensive and they aren't hard to replace. Good luck!

umermariner 11-26-2008 05:44 AM

Quote:

Originally Posted by mkodama (Post 8964850)
Thermostats in the E46 are designed to fail in the open positions. It won't light up the SES light on your dash but it will give a code. They aren't too expensive and they aren't hard to replace. Good luck!

So you mean, I should be able to get a code?
Also, what is the best way to confirm Thermostat failure, before actually taking it apart... temperature difference b/w hoses? I tried that this morning.. but was not sure...

Any other way?
Thanks.

kuksul08 12-01-2008 09:31 PM

If your car has a lot of miles you might want to replace the thermostat anyway. I recently did it and the car heats up much quicker.

I had a code before that said coolant temperature below engine regulating temperature or something like that which means it was running too cold.

umermariner 12-02-2008 09:14 AM

Quote:

Originally Posted by kuksul08 (Post 8994657)
If your car has a lot of miles you might want to replace the thermostat anyway. I recently did it and the car heats up much quicker.

I had a code before that said coolant temperature below engine regulating temperature or something like that which means it was running too cold.

I ll run the codes too... but I just had it changed around 15000 miles ago :(

thearmyman83 12-02-2008 09:28 AM

im in an 03 m3 and my temp is just a **** hair under 12 oclock sometimes a little lower within .25" of the "correct" position but it is 20-30 degrees here right now. NORMAL?:idea:

mkodama 12-03-2008 03:50 AM

Quote:

Originally Posted by umermariner (Post 8964891)
So you mean, I should be able to get a code?
Also, what is the best way to confirm Thermostat failure, before actually taking it apart... temperature difference b/w hoses? I tried that this morning.. but was not sure...

Any other way?
Thanks.

Yeah, the only way I found out that I had a thermostat failure is when I went to the dealer for my broken transmission and they gave me a code readout. So I bought a new thermostat, installed it, and sure enough, it warmed up a little quicker than normal and my mileage improved slightly.

Obviously though, if you car never gets to the 12 o'clock position than something is wrong. If you recently replaced your thermostat and don't think that is the issue you can have the codes read.

my1stbimmer:) 12-03-2008 08:16 PM

Have you bled the air out with the heat turned on?

umermariner 12-03-2008 08:45 PM

Quote:

Originally Posted by my1stbimmer:) (Post 9008410)
Have you bled the air out with the heat turned on?


I tried.. :(.. i losen the plastic screw just near the radiator oppening.. the heat was at 91, and the fan was at the min.. but still no air bubbles.. i didnt lift the front end though :)

simsima325 12-03-2008 08:50 PM

thermostat. replaced mine in 20min, topped up on coolant, and she settles nicely at 12 oclock. gets there fast too.

umermariner 12-03-2008 08:51 PM

Quote:

Originally Posted by simsima325 (Post 9008651)
thermostat. replaced mine in 20min, topped up on coolant, and she settles nicely at 12 oclock. gets there fast too.

20 mins :O... didnt you have to take out the fan and stuff?

simsima325 12-03-2008 08:57 PM

fan comes right out, gotta remove the belly pan too, there will be some coolant drippin :)

umermariner 12-03-2008 10:08 PM

Quote:

Originally Posted by simsima325 (Post 9008698)
fan comes right out, gotta remove the belly pan too, there will be some coolant drippin :)

hmmm.. u mean.. taking out the fan... and then replacing it will be about 20 mins.. hmm.. thats not bad (even if it is up to an hr.. its ok).

What do u mean by belly pan?

simsima325 12-03-2008 11:14 PM

the plastic panel under your engine

umermariner 12-04-2008 06:15 AM

Quote:

Originally Posted by simsima325 (Post 9009686)
the plastic panel under your engine

hmmmmmmmmm
I ll do that... as soon as the weather gets better :)... any other hint that may help me?

umermariner 12-04-2008 09:42 AM

Quote:

Originally Posted by simsima325 (Post 9009686)
the plastic panel under your engine

Question:... I looked at it.. seems like I can open it easily.. without even taking out the fan and the plastic pan..
but why everyone is suggesting to take these things out? Do I need to? I have manual transmission, and it has an electric fan.
Thanks

ApathyCsl 12-06-2008 07:49 PM

Thread Jacking.
 
Just replaced my upper hose and expansion tank after a bad overheating incident. Bled the system and Car runs fine now but the temp gauge is a few hairs past 12oClock. is this normal?


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