A couple of weeks ago I noticed my temperature gauge jumping up and down. That is, it would show that the engine was hotter than normal and then suddenly it would jump below normal. During this same time I noticed my heater would only blow warm air when the RMS were above about 3000.
Now, the vehicle is overheating if I drive it on the freeway (about 230-240 degrees), and will consistently stay way above normal (about 215-225 degrees) if I drive on side streets and keep the RPM's low. Also, the heater does not blow any hot air what so ever, which has changed from before. However, the vehicle is not losing any fluid, the radiator is completely full.
I am thinking it is probably the thermostat but I am not positive. What do you think?
Saturday, December 15th, 2018 AT 11:51 AM