Hi,
I recently changed the thermostat on my M10 engine e21. No particular reason apart from the fact it was an easy & cheap thing to do and I was changing the radiator fluid anyway (I don't think it had been done for a while). The brand of the new thermostat is Mahle.
As you are aware the temp gauge on the facelifted e21 has 5 marks (or lines) creating four 'zones'. Previously the car consistently ran a bit over the middle mark into the third zone. After the thermostat change it now consistently runs a bit UNDER the middle mark in the second zone.
Is this all ok and expected? Or is my thermostat not quite right?
Cheers
Thermostat
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- E21 starter
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Re: Thermostat
The temperature gauge is rather sensitive in that specific area, so a few degrees difference might give another result, but nothing to worry about. Mine is a bit before the middle dash as well. It is worrying when it stays at the next whole dash before or after the middle.
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- E21 starter
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- Joined: Mon Mar 25, 2019 9:40 pm
- My E21(s): 1981 European 316 1.6
Re: Thermostat
Thanks for your comments - much appreciated
- petroscf
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Re: Thermostat
Totally agreeing with Wilmo, I would like to add the following from my experience :
When my car was all normal - and radiator working all right (normal meaning factory specs: thermostat 80 deg C, mechanical fan operating following engine turn) safe temp level was when the needle was staying from a bit before middle up to a bit over middle (max). When outside temp was normal and car was running on a free road with normal speeds, needle stayed a bit under the middle point ('dash'). At traffic (car idling for long) and/or very hot days and/or very spirited driving, or big loads, or driving uphill etc., the needle could climb a bit over the middle, but that would be all. When temp started climbing over than this it was time to inspect the system.
All the above, when after years I replaced factory specs thermostat by the 71 deg, started happening at half 'zone' less. I mean that normal temp was held a bit over the 2nd 'dash', and when things would get hotter, then the needle started climbing towards the middle.
Now with the custom made engine things are a bit more complicated, with combination of mechanical and electric fan etc. but I will not continue because it would be confusing.
When my car was all normal - and radiator working all right (normal meaning factory specs: thermostat 80 deg C, mechanical fan operating following engine turn) safe temp level was when the needle was staying from a bit before middle up to a bit over middle (max). When outside temp was normal and car was running on a free road with normal speeds, needle stayed a bit under the middle point ('dash'). At traffic (car idling for long) and/or very hot days and/or very spirited driving, or big loads, or driving uphill etc., the needle could climb a bit over the middle, but that would be all. When temp started climbing over than this it was time to inspect the system.
All the above, when after years I replaced factory specs thermostat by the 71 deg, started happening at half 'zone' less. I mean that normal temp was held a bit over the 2nd 'dash', and when things would get hotter, then the needle started climbing towards the middle.
Now with the custom made engine things are a bit more complicated, with combination of mechanical and electric fan etc. but I will not continue because it would be confusing.
/oo=00=oo\
E21 Forever
E21 Forever