Vehicle has new water pump, thermostat, fan clutch. The front of the radiator along with the A/C condenser was cleaned to be sure good air flow through each. Vehicle temp gauge will jump from 210 to 240 in seconds & then back to 210 again in just a few seconds. After driving for a few miles it will then spike to 240 & stay there for the rest of the trip. With heater on high it don't seem to make much difference & sometime just sitting at idle is will drop down to the 210. Why is the temp jumping up & down so much? Someone said it was a sensor maybe near the thermostat? Vehicle never had overheating problems until a garage changed the water pump & one week later the overheating began. Also the radiator cap has been replaced. Not sure what to check next, but this is getting old & its not worth the money that is getting put into this thing.
Wednesday, June 5th, 2013 AT 7:31 PM