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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 12-27-2012, 12:14 AM
Tejijohal Tejijohal is offline
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Location: London
 
Join Date: Dec 2012
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Mein Auto: Bmw z3
Heater blow cold air and car overheat

Hi all. My z3 1.9 1999 heater blow cold air and also engine overheat when drive slow or in traffic. There is no coolent leak and i bled the system already.
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  #2  
Old 12-27-2012, 02:02 AM
Droptop85 Droptop85 is offline
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Mein Auto: 03 Z4 3.0i
Either you have no coolant or your thermostat is stuck shut
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  #3  
Old 12-27-2012, 02:58 AM
Tejijohal Tejijohal is offline
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Mein Auto: Bmw z3
Thanks for reply. Coolent is full I have checked few times. If there is thermostat problem how do i fix that ? I am wondering if the water pump is working or not
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  #4  
Old 12-27-2012, 03:07 AM
Droptop85 Droptop85 is offline
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Mein Auto: 03 Z4 3.0i
It's hard to say. I would replace te thermastate and thermastate housing before replacing the water pump. Reason being it's cheaper. While the vehicle is running and at operating temp try squeezing your radiator hoses. If they they are super stiff you have built up psi. They should be squeezable while the vehicle is running and at normal operating temp. If not. Thermastate is stuck closed.
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  #5  
Old 12-27-2012, 09:14 AM
Tejijohal Tejijohal is offline
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Thanks for help. I will try that
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  #6  
Old 12-29-2012, 06:10 PM
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morrieschoice morrieschoice is offline
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Mein Auto: 2001 3.0 Z-3 ROADSTER
overheating

If you decide to replace the thermostat, strongly consider replacing the water pump. Make sure you get one with a metal impeller....(see photo of 'new" pump with composite impeller). This is what caused my car to overheat after replacing the entire cooling system.
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  #7  
Old 12-30-2012, 09:00 AM
dougmcintyre dougmcintyre is offline
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Location: Chapel Hill, NC
 
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Mein Auto: 2000 M Coupe, 1997 318ti
Does the car have the original cooling system? If yes or unknown, I'd replace every component of that 12+ year old cooling system. The component quality of our cooling systems are, ahh, sketchy.

See
http://www.318ti.org/forum/showthrea...hlight=cooling
http://www.318ti.org/forum/showthread.php?t=18066
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