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General E46 Forum
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Old 10-28-2013, 12:59 PM   #1
94jedi
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Heater not working?

Hey all, as the title states, my heater is blowing ambient temp air, maybe even "warm" air but doesn't get hot at all even after the car reaches normal operating temp.

No CEL's, no changes, car temp is fine etc. It blew hot air last week no prob, just this morning is when the issue started.

I did some searching/reading and it looks like the heater control valve may be the culprit.

Any thoughts? Thanks!
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Old 10-28-2013, 01:01 PM   #2
Chaplian
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Could also possibly be the thermostat. How many miles does your car have and did you ever overhaul the cooling system?
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Old 10-28-2013, 01:21 PM   #3
94jedi
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Could also possibly be the thermostat. How many miles does your car have and did you ever overhaul the cooling system?
92,500 and no cooling system overhaul yet - It's on the "to do" list.
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Old 10-28-2013, 01:29 PM   #4
LeMansteve
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Heater not working?

At that mileage I'm betting bad thermostat. Check your coolant temp via the OBC display and report back.


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Old 10-28-2013, 02:03 PM   #5
Hamsocne
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I would guess the therm, too.

I was not on this site for my first 02 e46 and at 90,000 plus I cannot find where any cooling system work was done, I didn't know better and owned it from 60k to 90k. I have all the records and looked.

On this 02 the therm was replaced by the previous owner at 38,000 miles. I have done the rest of the cooling system minus the radiator and am at 72,000.

It is so nice to have these records. I doubt this helps. Go to JFOJ's link about soft fails. Access the temp and see.
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Old 10-28-2013, 02:20 PM   #6
jfoj
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Bring up the Hidden OBC Menu and watch the engine temp on your OBC/Dash.

You should come up to about 95-96C and stay there.

Also check for low coolant and air in the system.

BE CAREFUL, do not fill the expansion tank up much, make sure the float is on t low side if the temp is below 68F.

Hit the Fractured Prune & Dumser's for me while your at it!
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 10-28-2013 at 02:20 PM.
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Old 10-28-2013, 02:22 PM   #7
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Quote:
Originally Posted by jfoj View Post
3rd link below in my signature.

Bring up the Hidden OBC Menu and watch the engine temp on your OBC/Dash.

You should come up to about 95-96C and stay there.

Also check for low coolant and air in the system.

BE CAREFUL, do not fill the expansion tank up much, make sure the float is on t low side if the temp is below 68F.

Hit the Fractured Prune & Dumser's for me while your at it!
I get a steady 97 C in the garage sitting still at 5500 rpm
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Old 10-28-2013, 02:23 PM   #8
94jedi
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Quote:
Originally Posted by jfoj View Post
3rd link below in my signature.

Bring up the Hidden OBC Menu and watch the engine temp on your OBC/Dash.

You should come up to about 95-96C and stay there.

Also check for low coolant and air in the system.

BE CAREFUL, do not fill the expansion tank up much, make sure the float is on t low side if the temp is below 68F.

Hit the Fractured Prune & Dumser's for me while your at it!
Thanks for the tip! I'm searching for the "how to" for pulling up the hidden OBC menu.

If I can get my heat working without blowing a lot of $ on a fix, then Dumser's is on me next time you're down here lol.
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Old 10-28-2013, 02:32 PM   #9
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Originally Posted by 94jedi View Post
Thanks for the tip! I'm searching for the "how to" for pulling up the hidden OBC menu.

If I can get my heat working without blowing a lot of $ on a fix, then Dumser's is on me next time you're down here lol.
Also check YouTube for the Hidden Menu, the issue is it is all about timing of button pushing, my E39 is FAR easier to access than the E46!
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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, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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

Lower hose fan switch O-ring - BMW #13621743299
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