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1996 BMW 318 engine is overheating

Tiny
SCORPO
  • MEMBER
  • 1996 BMW 318
Engine Cooling problem
1996 BMW 318 4 cyl Two Wheel Drive 187000 miles

I have a 96` 318 TI automatic, has 187k on it.
-i just replaced the coolant temp. Switch(fan switch) and the thermostat, my fan doesn`t come on and the car over heats at idle. The radiator and the hoses r LEAK FREE, the fan works when jumped, other than the high and reg. Speed relays possibly needing replacement, should I look into a water pump of would there be evidence or failure such as noise?
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Thursday, February 21st, 2008 AT 12:18 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test the fan relays -computer might not be energizing it or a wiring problem from the temp. Switch
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Thursday, February 21st, 2008 AT 3:46 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There should be a fan driven off the water pump, if not it needs one as I just fought the same battle as you with the exact same car. Put a mechanical fan and fan clutch on it and you should have the problem solved mate!
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Thursday, February 21st, 2008 AT 4:26 PM
Tiny
SCORPO
  • MEMBER
  • 4 POSTS
The problem was that the impeller on the water pump was detroyed due to the previous owner ONLY using straight water for coolant. There wasn`t and water flow and the water that was in the radiator never got hot enough to kick the switch. Since the switch monitors the coolant temo in the rad. It never tripped the fan. Thanks guys
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Friday, February 22nd, 2008 AT 10:11 AM

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