hi folks,
I just replaced the thermostat in my 95 GMC K1500, which is not yet the Vortec engine.
I am more a hobby mechanic rather than a pro so Im not sure if its working correctly.
Here is what it does with the new 195F Thermostat:
Start engine and idle for ca 5 minutes: temp shows around 150-169 F.
When reving up the engine for some time the temp gets as high as 200 then drops again fairly quickly to 150/160.
What I dont get is why the upper hose from engine to radiator collapses when temp is below 200 when hitting the gas??
Also when opening the rad cap the coolant squirts out big time.
Then I installed the original thermostat back, also 195F and all of a sudden I dont see a temp value in the gauge anymore even after driving around for half an hour. That would mean the temp is below 110 all the time which cant be good, right?? And this because the old thermostat wouldnt be closing??
I added enough coolant maybe a finger below rad cap.
What is wrong with the system or is the first scenario absolutely normal?
Thanks for your hints!
I just replaced the thermostat in my 95 GMC K1500, which is not yet the Vortec engine.
I am more a hobby mechanic rather than a pro so Im not sure if its working correctly.
Here is what it does with the new 195F Thermostat:
Start engine and idle for ca 5 minutes: temp shows around 150-169 F.
When reving up the engine for some time the temp gets as high as 200 then drops again fairly quickly to 150/160.
What I dont get is why the upper hose from engine to radiator collapses when temp is below 200 when hitting the gas??
Also when opening the rad cap the coolant squirts out big time.
Then I installed the original thermostat back, also 195F and all of a sudden I dont see a temp value in the gauge anymore even after driving around for half an hour. That would mean the temp is below 110 all the time which cant be good, right?? And this because the old thermostat wouldnt be closing??
I added enough coolant maybe a finger below rad cap.
What is wrong with the system or is the first scenario absolutely normal?
Thanks for your hints!