Quote:
Originally Posted by imagesinthewind
Okay, I was wrong, I'm not fixed.
I was on the hwy today and the gauge went to 110. I turned on the defrost to get some of the heat off and it went back down to 100. Driving more, the gauge went to 90, up to 105, down to 85, up to 100. No rhyme or reason to the fluctuation.
The gauge just goes up and down, with the heat on, with it off, at high speeds at lower speeds.
When I got home I unplugged the mono to default to highest heat and let the car idle. It went back down to 85 with the defrost on (mono unplugged) and when i turned it off the heat the gauge is creeping up slowly. 8 minutes or so and still at about 95.
The good news is the WVO tank is now showing 152*. Which is the reason I changed the tstat in the first place, the car AND the oil couldn't both heat up before. Gauge would show 65-70 and the oil would show 100-105. When the heat was turned n the gauge would drop and the oil temp would drop. (all oil references here is WVO not engine oil).
Should I jack up the front of the car to get the head higher or put in another tstat?
I'm on an incline now but maybe not high enough?
The tstat came out of the parts car. It's new too, and the DH told me this morning that his car always ran right around 100* since no one told him that was kinda high he never through twice about it. Shop did his tstat, not him. So you think the tstat is bad?
Thanks
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Well if your temp guage was not acting like that before, then yes, I think the thermostat is defective or the incorrect operating range. My 240D and my 300D both run at 85*C in Arizona in the summer heat!

So there is a problem here somewhere. I would believe that the temp swings your looking at are now caused by the opening and closing of a questionable T-Stat. I would replace it with a Stant at 85*C or 170*F and report back.