WONT RUN AT RIGHT Op Temp!!!

[Th3importedguy]

Okay so the average temperature my car runs at is just a bit over 1/8 and that's after I've been driving it for a while. Heat barley works at that temp. But if I let the car sit for Long the temperature rises but will eventually overheat. Once I let the car sit it rises to normal operating temperature (half way) and I go to driving as soon as I get on the gas you can see the temp gauge start to fall back down to the 1/8 mark. I've gotten the water pump and the thermostat changed when I got my new m42. The old one had the same problem. It sounds like a stuck open thermostat but how is that possible?? Help .__.


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[jeffnhiscars]

Tstats and temp gauges are notoriously unreliable. I'd boil it and see what temp it opens at and make sure your heater core is getting enough circulation.

[dnguyen1963]

Are you sure you have the right tstat? Yours might be a 70 tstat making the car running much cooler. It might be that the car was overheating before and the previous owner put in a cooler tstat.

[Das Delfin]

+1 on check your t stat
+1 on check for other things causing the car to over heat (low coolant, failing water pump, leak, etc)

[lukeADE335i]

If it's fine driving, but heats up stopped, check your fan clutch too. Might not be sucking enough air through the radiator.

[nk1221]

Mine was doing the same thing. Just changed my t stat and now everything works perfect. My old one was definitely toasted and it was the wrong temp anyways.

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[Th3importedguy]

My biggest concern is why is runs so cold, so it the thermostat? Or at least it seems to be that from what you guys are telling me


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[MouseRat]

I had a similar (ish) issue with my M42 E30.

Temp would rise up to past half way when I was stopped and even back out while moving. There wasn't much heat coming out of the vents either. I fixed both issues by bleeding the cooling system. I think I had air stuck in the heater core/matrix.

If you're running too cool while driving and too hot while not, my best guess would be a combo of the tstat being too low of a temp and the fan/clutch not drawing through enough air.