2002 chevy blazer quickly overheating


Asked by Aug 17, 2019 at 10:23 AM about the 2002 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

My blazer is overheating quickly, it started out as
overheating when the a.c. is on an at idle. Now just
yesterday  it began to overheat every few minutes.
I had the radiator replaced and the thermostat as
well, just few weeks ago...a.c. works fine, tried to
turn the heat on to help with the overheating an
didn't feel no heat coming out, felt cool air ..

6 Answers


Overheating at idle indicates that the problem is the cooling fan. with the AC on, the fan runs and if not, this too points to the cooling fan. You probably have a blown fuse or relay, defective fan clutch or wiring, bad fan temperature switch, or bad fan motor.

2 people found this helpful.

Thank you at least I have an idea on where to start. I greatly appreciate it.


Sounds like a bad water pump. With cool air coming from the heater that points to the coolant not circulating through the cooling system. So I'd suspect the water pump is bad. Hope that helps! Jim

1 people found this helpful.

Yeah I figure its between the water pump an fan... hope I can afford to get this repaired. Wheres the best place to start on checking my fan??

1 people found this helpful.

You have a clutch fan. So when the engine gets hot you should hear a definite roar sound as the clutch engages and the fan pulls more air through the radiator. Does the upper radiator hose get hot? If not, since the thermostat is new,that would also point to the water pump the impeller inside the water pump may be rusted away. I ran into that with my 2000 Grand Prix. Note the pictures of the new water pump compared to the old one. Hope that helps! Jim

1 people found this helpful.


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