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Old 05-01-2006, 06:52 AM   #1
markierant
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Question Another overheating problem (with a twist)

Here we go, on a 99 E36 M3, when I do regular driving ( highway, streets @60km) the water temp is fine, but when I get into heavy traffic situations the car overheats. The twist is, when I go back to regular driving (80km/h for about 20 min last time the car doesnt return to regular temp and stays at 75% hot on the gauge. In short regular driving fine, traffic overheating, back to reg drive temp stays hot. I did the newspaper trick with my fan and yes it does stop so I know I need a new fan clutch, and I think my AC fan is not coming on either , but why the temp doesnt go back to regular when I pick up speed.

Help. Throw some advice my way so I can buy the right parts and fix the prob.( other than the fan clutch, i know I need that)

ps. Only strted happening once the temperatures went up, not a prob on a cold day 5 C or colder.
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Old 05-01-2006, 07:22 AM   #2
soon2b-e
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you could have either a fan not turning (fan clutch) or a thermostat problem, it might not want to open at the designated tempurature

for the fan clutch, you should get that fixed right away, start with this item first since it should be priority as it is, or you'll be looking to replace the fan blade like i did (oh and the shroud too, oh and dont forget the rad, and hoses....and well...you get the point)
this should be about 150 from altrom
the thermostat is about 30 dollars everywhere else

i know that when i was driving around without a fan it started to do the exact same thing like you said, on the highway it was alright, would go to 75% then back to 50, but then in the city it started to spike way up, forcing me to shut the car down for a few hours before venturing again, thats what made my decision on getting the fan again
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Old 05-01-2006, 08:43 AM   #3
Darkness95m3
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Sounds like the fan clutch.
Either way for $30 I would replace the thermostat.
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Old 05-01-2006, 12:23 PM   #4
BennyL
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where can you get a thermostat for $30 ?
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Old 05-01-2006, 12:28 PM   #5
mirek
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precision tuning.
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Old 05-01-2006, 12:44 PM   #6
BennyL
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are the thermostats on all E36 the same?

are they the same between M42, M44, M50, M52, S52?

and are they the same over the years, or did they change at some point?
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Old 05-01-2006, 01:09 PM   #7
soon2b-e
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bennyl: not sure man, but your best bet is to call up a parts distributor and try asking for different years
i was imagine the thermostat would be the same IF the housing is the same
and to everyone that asks where you can get thermostat for 30 dollars, you need to call around for pricing, maybe even pretend that your a local garage ?

E.G.

Parts dist.: Hello, parts dist., chris speaking
You: hi, this is (your name) from (local garage) speaking, i need a parts for my (year) BMW (model), what is my cost on that..... well you get the point...
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Old 05-01-2006, 04:12 PM   #8
Darkness95m3
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Quote:
Originally Posted by BennyL
are the thermostats on all E36 the same?

are they the same between M42, M44, M50, M52, S52?

and are they the same over the years, or did they change at some point?
They are different. I would go to a regular parts shop "Napa" just for example or even better call some of the supporting vendors on the site, see if you can purchase a "fail safe thermostat" I think that's what they call them.
When this unit fails it opens instead of closing like the ones from BMW
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