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Author Topic: No Heat?  (Read 13335 times)

KenC

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No Heat?
« Reply #15 on: October 18, 2008, 09:39:29 AM »
I think I can rule out an air bubble as I've bled it three times on an incline.

Do you have a link to the MB article regarding the acid flush?

Quote from: Wise Old Dog;58801
It sounds like everything is working except that it is not flowing hot water through the heater core as it should. 3 causes for this:
Air bubble in the system preventing full flow.
Improperly functioning heater valve.
Clogged heater core.

Mercedes recommends a citric acid flush for their cooling systems. I just finished doing this on mine, and if there's  crud in the core the flush procedure should clear it. It is pretty involved, and will kill an afternoon doing it, but it is effective. Info is on the MB mechanic board.
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Wise Old Dog

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No Heat?
« Reply #16 on: October 18, 2008, 12:10:48 PM »
http://www.schumanautomotive.com/forums/showthread.php?t=264

Here's a good thread from the Schuman forum.

You can google it and find plenty of info.
I used Shout Gel for a degreaser.
e-bay might be your best source for the acid.
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monty23psk

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No Heat?
« Reply #17 on: October 18, 2008, 12:58:31 PM »
Before you do the flush, make sure the valve is working. They do go bad. The bentley manaul, I think, has a procedure for testing it. You should hear a thump or click. Also on my e28, the temp selector knob was bad and would not give the correct voltage to the valve. You might have to look over the ETM to see how it works on the e30.
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Alex  88 m5 | 91 318is | 19 Subaru Ascent
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RED IS 91

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No Heat?
« Reply #18 on: October 19, 2008, 05:33:33 AM »
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ak96ss

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No Heat?
« Reply #19 on: October 19, 2008, 07:22:36 AM »
You know, the other thing that occurs to me is that recall that was done to add another valve between the block and the heater core, something to do with limiting pressure to the heater core so folks wouldn't have their legs scalded in the event of overpressurization of the cooling system...  anyone remember the details of that, and do you have that valve in the path between the block and the firewall?

I also found a magazine article I saved from somewhere that shows how to rebuild the heater valve; unfortunately, I have no means of hosting the file, so if you would like it, send me a PM and I'll try to email it to you.
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uh, it's a '91 318is, like everyone else...

Angus1211

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No Heat?
« Reply #20 on: October 21, 2008, 04:08:38 PM »
I too have this problem in my e36.... but no heat at any rpm's and engine temp runs fine.

where do i start?
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KenC

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No Heat?
« Reply #21 on: October 28, 2008, 10:40:55 AM »
Is the heater valve a separate part from the inlet pipe?  Realoem makes it look like one.
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KenC

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« Reply #22 on: October 29, 2008, 11:10:47 AM »
Quote from: KenCopperwheat;59637
Is the heater valve a separate part from the inlet pipe?  Realoem makes it look like one.



anyone?
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monty23psk

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« Reply #23 on: October 29, 2008, 11:14:58 AM »
I believe it is. Wil be in between heater core and inlet pipes coming from engine bay. I haven't done this work so not sure. I know there is a link on a DIY listed above.
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Alex  88 m5 | 91 318is | 19 Subaru Ascent
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txleadfoot

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No Heat?
« Reply #24 on: October 29, 2008, 02:11:56 PM »
Mine had the opposite symptoms until I corrected the issue last night.  The heater hoses at the firewall were reversed.  I only got heat at idle and cold air while driving.
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KenC

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« Reply #25 on: November 13, 2008, 11:18:58 AM »
I'm still stumped.  I replaced the heater core and heater valve last night, and I'm still having the same issue.

I only get heat while the rpms are above 2500.  It doesn not matter whether the car is moving or not.

My coolant temp rises at idle, but will maintain a normal temp when the rpms are above 2500.  It doesn't make a difference if the car is moving vs stationary.

Any ideas?  Could a bad fan-clutch cause the issues with the heater output?
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EN318isPDX

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No Heat?
« Reply #26 on: November 13, 2008, 11:33:28 AM »
Quote from: KenCopperwheat;60623
I'm still stumped.  I replaced the heater core and heater valve last night, and I'm still having the same issue.

I only get heat while the rpms are above 2500.  It doesn not matter whether the car is moving or not.

My coolant temp rises at idle, but will maintain a normal temp when the rpms are above 2500.  It doesn't make a difference if the car is moving vs stationary.

Any ideas?  Could a bad fan-clutch cause the issues with the heater output?


Can you hear the fan kicking on? For some reason someone pulled out my blower fan so i would only get heat when i revved the car or was moving fairly fast. Its really easy to get too.. Gotta move the wiring and there is a little door in the firewall to get to it. It has a resistor that could be bad or broken and would cause your heat to not work.
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roundel318

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No Heat?
« Reply #27 on: November 13, 2008, 11:42:28 AM »
coolant pump?
coolant is made to transfer heat, it could be moving heat through from the engine to hoses enough to make you think its really moving liquid, but is there really the pressure there should be?
not sure, just wondering....
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KenC

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« Reply #28 on: November 13, 2008, 01:05:02 PM »
Quote from: EN318isPDX;60631
Can you hear the fan kicking on? For some reason someone pulled out my blower fan so i would only get heat when i revved the car or was moving fairly fast. Its really easy to get too.. Gotta move the wiring and there is a little door in the firewall to get to it. It has a resistor that could be bad or broken and would cause your heat to not work.


Blower motor has been replaced and works great.
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KenC

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No Heat?
« Reply #29 on: November 13, 2008, 01:16:09 PM »
Quote from: roundel318;60632
coolant pump?
coolant is made to transfer heat, it could be moving heat through from the engine to hoses enough to make you think its really moving liquid, but is there really the pressure there should be?
not sure, just wondering....


Como?

Water pump is brand new.
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