2000 blazer overheats when shut off
Asked by KenneyK May 30, 2019 at 01:31 PM about the 2000 Chevrolet Blazer LS 4-Door 4WD
Question type: Maintenance & Repair
My 2000 blazer 4.3 will overheat after i turn it off
and restart after a few munutes. I cannot figure out
why. I have replaced the thermostat, twice, radiator,
all hoses and oil cooling lines, and fan clutch what
am I missing?
3 Answers
Hornet_2497 answered 5 years ago
Maybe the temp sending unit is sending a false reading that it's hot when it really isn't. Take one of those infrared temperature sensors and scan your cooling system and see what you get. I've also seen water pumps with plastic impellers deteriorate and the blades crumble off...won't pump. You can sometime look down into the radiator and see if the coolant circulates while you rev up the engine while it's hot.
Follow up question... with the fanclutch, is it normal for the fan to "roar-up" when taking off from a stop at running temp? It really draws the horse power.
