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fairly significant
Typical Repair Cost:
Average Mileage:
104,162 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. not sure (2 reports)
  2. Ƨheck radiat0r f0r bl0ckage (1 reports)
  3. new fan clutch, flushed cooling system (1 reports)
2000 Chevrolet Blazer cooling system problems

cooling system problem

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2000 Chevrolet Blazer Owner Comments

problem #4

May 182012

Blazer LT

  • Automatic transmission
  • 92,300 miles


The blazer overheats when the air conditioner is on. The coolant literally boils in the reservoir and the temp goes up to 230. The fan clutch is seems to be working. I see others have had the same issue so we're going to try what they tried.

- , Parchment, MI, USA

problem #3

Jun 102011

Blazer LS 4.3L

  • Automatic transmission
  • 118,000 miles

Overheating on near 100 degree days when going slowly up a hill, ok when on the highway, fan clutch seemed to be working, passed diagnostic check but other than replacing radiator I wasn't sure what to do, after replacing fan clutch problem gone. Did it myself, not as easy as it looks, unscrews from water pump, right hand threads, had to have a cheater bar to break it loose, also requires a special spanner wrench to hold pump from turning while you break it loose.

- , Greenwood, AR, USA

problem #2

Jun 292009

Blazer LS V6

  • Automatic transmission
  • 67,350 miles

Currently renting a 2000 Blazer which is playing tricks with me... the temperature gauge will go up to 260 and then fall back down to 220, then go up to 260 again in about 5 mins. This cycle continues for the duration of my driving time and I am worried that one day my hood will explode off in a shower of boiling coolant if I dont getit fixed. Possibly a broken thermostat anyone?? Anyone else have this issue? One thing is for sure... the temperature gauge never settles at the safe "middle" tick mark.

Maybe its the gauges that are fouling...but I have warning lights...

- , Hagerstown, MD, USA

problem #1

Jun 032009

Blazer 4.3L

  • Automatic transmission
  • 139,000 miles

The wife came home yesterday with an overheated car. Luckily, she made into the driveway just as the coolant reservior overflowed. I was suspecting the heater core clogged, so I bypassed it with some McGyver fixing. But to my dismay, it still overheated. I will update when I get it fixed

Update from Jun 8, 2009: Turns out it was just a stuck thermostat. $10 at autozone. Way easy to switch out

Update from Jan 23, 2010: The heater and the thermostat had nothing to do with overheating. The problems persisted and eventually the radiator cracked. Came to find out that the space between the radiator and A/C heat exchange collects alot of garbage (leaves, bugs, feathers!) This clogged up a significant section of the radiator, greatly reducing its capacity to cool. In hindsight it would be wise to check this area often and blowout the crap. Not quite sure how easy that would be given the tight space. It may be necessary to remove the radiator to clean it.

- , West Valley, UT, USA

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