1999 GMC Jimmy Q&A
1999 GMC Jimmy Question: Overheating
Get it diagnosed properly for either a stuck thermostat ,bad fan clutch ,blown head gasket.You state that your plastic reservoir is full ,when you drive for ten minutes .Was it empty or low before you start and does it empty out (sucked back in engine/radiator) after it cools?From a cold start (after sitting over night) check the radiator level , make sure the system isn't pressurised , then start it and check the top hose at a safe point.If you can feel bubbling or if the hose is feeling 'tighter' very rapidly (within a minute or two) MY opinion would be a blown head gasket , just get a second opinion before you spend any money (other than coolant for test purposes).Go backwards and re-check the obvious , which we all can often overlook in our initial haste.Good luck. - ziptie12
I have replaced the radiator on my 1998 JMC Jimmy and continue to gave problems with the car overheating. I have also replaced the thermostat several times. The gauge fluctuates back and forth.
This just happened to me today. I have a 2001 GMC JIMMY that has 116,000 miles on it. I wsa driving on highway and tried to quickly accelerate by punching the gas. Just after this the car started s...
A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.