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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-27-2016, 11:08 AM
marjam54 marjam54 is offline
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Replaced FSU twice now...

something is going on again. The heater only blows hot air when I am driving, as soon as I stop it is cold. Could this be the FSU again or something else? Thanks!
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  #2  
Old 03-27-2016, 12:57 PM
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Have you checked the setting of your central dash vent ? Is it all red, or all blue, or somewhere in the middle ?
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Old 03-27-2016, 01:45 PM
marjam54 marjam54 is offline
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All red. Even if I turn the temperature to 91 which is highest it will go it still blows cold.
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Old 03-27-2016, 10:33 PM
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Quote:
Originally Posted by marjam54 View Post
All red. Even if I turn the temperature to 91 which is highest it will go it still blows cold.
Sounds like a stuck thermostat. What does your temp gauge read? In the middle or to the left of middle?

Could also be a clogged heater core.
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Last edited by smolck; 03-27-2016 at 10:34 PM.
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  #5  
Old 03-27-2016, 11:41 PM
Coffee Phil Coffee Phil is offline
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Hi Marjam54,

If the heater blower is working and is controllable your FSU is fine.

I believe your complaint is the same as I posted here a while back. At engine idle the air from the heater becomes cold. Even with the car stationary getting the engine above idle to about 1200 RPM restores the warm air.

The responses which I received suggested low coolant or the need to bleed the cooling system. My coolant level is fine but there may be something to the bleeding thing. Now I haven't done it yet as I am skeptical. I have no overheating issues and the heater works fine with the engine off idle. I have had the car since November so I'm assuming the bleeding should have taken care of itself by now. In any case I'll do it just to check it off the list. My paranoia is about the coolant pump and after the bleeding experiment I may remove and inspect it. I come from the e36 world and early e36 pumps had faulty impellers. This could also be a design issue. My wife had an e32 which had a small electrically powered pump to pump coolant to the heater. It screwed up and I bypassed it planning to secure a replacement. The heater continued to work fine so I forgot about it. I'm guessing it was a bandaid because some V8 e32s may have exhibited the same issue which we are having.

Phil

Quote:
Originally Posted by marjam54 View Post
something is going on again. The heater only blows hot air when I am driving, as soon as I stop it is cold. Could this be the FSU again or something else? Thanks!
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  #6  
Old 03-28-2016, 12:55 PM
marjam54 marjam54 is offline
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Quote:
Originally Posted by smolck View Post
Sounds like a stuck thermostat. What does your temp gauge read? In the middle or to the left of middle?

Could also be a clogged heater core.
The temp gauge is in the middle.
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  #7  
Old 03-28-2016, 12:57 PM
marjam54 marjam54 is offline
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Location: USA
 
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Quote:
Originally Posted by Coffee Phil View Post
Hi Marjam54,

If the heater blower is working and is controllable your FSU is fine.

I believe your complaint is the same as I posted here a while back. At engine idle the air from the heater becomes cold. Even with the car stationary getting the engine above idle to about 1200 RPM restores the warm air.

The responses which I received suggested low coolant or the need to bleed the cooling system. My coolant level is fine but there may be something to the bleeding thing. Now I haven't done it yet as I am skeptical. I have no overheating issues and the heater works fine with the engine off idle. I have had the car since November so I'm assuming the bleeding should have taken care of itself by now. In any case I'll do it just to check it off the list. My paranoia is about the coolant pump and after the bleeding experiment I may remove and inspect it. I come from the e36 world and early e36 pumps had faulty impellers. This could also be a design issue. My wife had an e32 which had a small electrically powered pump to pump coolant to the heater. It screwed up and I bypassed it planning to secure a replacement. The heater continued to work fine so I forgot about it. I'm guessing it was a bandaid because some V8 e32s may have exhibited the same issue which we are having.

Phil

Thanks very much! My husband put coolant in yesterday so I will see it if helps! Thanks for your information.
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