F
fossey28035
Guest
Bought used in December. Chronically overcooled coolant. Gauge showed between 100 and 120 degrees on road. Replaced thermostat, now needle ranges from 120 to 250. As best I can tell gauge is correct. I've discovered that coolant temp. is dependent on rpm level. Over 2,000 rpm, and no matter what speed I am at, coolant drops rapidly to 110-130 degrees (40 degree F ambient temp.). Below 2,000 rpm, temp. will rise to and beyond 190 degrees. Often will push 230-250, bring on high temp. light, but will usually fall back down to 150-190 after a few seconds. Sometimes it doesn't, and all I have to do is downshift to get rpms up over 2000, and it will cool instantly. Seems like this erratic thermostat is taking its commands from the engine speed, but why?? Is the water pump failing? Do I have blocked hoses? Interestingly, when the car is cold, the idler that keeps the rpms up is actually PREVENTING the car from warming up. This correlation between high rpm and cool engine is absolute. It's also strange. Please help!