why is my 1999 chevy s10 blazer overheating

Asked by Jun 14, 2016 at 04:10 PM about the 1999 Chevrolet Blazer 4 Door LS

Question type: Maintenance & Repair

just put new thermostat...replaced hoses....flushed radiator and it is still
running hot....when i turn my ac off temp goes down a little. I am not loosing

2 Answers


At your truck's age you might need a new water pump. The fins on the impeller may be worn down to nothing (antifreeze also takes its toll). When the truck is running squeeze the radiator hoses and see if they feel like they are under pressure.


You stated that the temp drops when you turn off the A/C, I would check for a good air flow through the radiator and A/C heat exchanger, bugs, dirt can build up and restrict flow, if it is all clean then the radiator maybe restricted internally so the coolant is not flowing as well as it should, one of those little lazer temp guns could show you how well the radiator is cooling and show any hot spots that it might have, indicating that the radiator needs replacement.

Your Answer

Add photo

Related Questions

  • overheating put a new thermostat in 3 answers

    I have a 93 4.3 Vortec Chevy S10 Blazer put in new thermostat and it is still overheating as I'm sitting at a red light as soon as I hit the gas and hold it to the floor as I take off it cools dow...

    1993 Chevrolet Blazer 4WD


    Maintenance & Repair

  • why is my chevy 1998 blazer overheating ? and what is a easy and quick solucion 2 answers

    th temperature of my 98 blazer get up to 100 degress . very easily. i checked and replaced the radiator and the transmitions is fine, what am i missing?

    1998 Chevrolet Blazer 4 Door LS


    Maintenance & Repair

  • '99 chevy blazer will not turn over!!, and don't know ANYTHING about fixing vehicles :( 3 answers

    i have just bought a 99' chevy blazer and three days after putting insurance on it the thing shut down. first it was we ran out of gas so put gas in the tank and tried to start. would not start so ...

    1999 Chevrolet Blazer 4 Door LS


    Maintenance & Repair

  • blazer overheating 6 answers

    I'm having an issue with my blazer overheating. I am leaking coolant but can't figure out where from. I have replaced the thermostat, before realizing there was a leak. I found one leak around...

    1998 Chevrolet Blazer 4 Door LS


    Maintenance & Repair

  • 2001 Chevy Blazer overheating 1 answer

    My intake manifold was leaking coolant while on a roadtrip, I took it to a shop to have it replaced which they did. Now when at highway speeds the truck overheats. It never overheated prior to havi...

    2001 Chevrolet Blazer 4 Door LS 4WD



Search Chevrolet Blazer Questions

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,900
#2 yetilikesbeer
Reputation 1,190
#3 Rowefast
Reputation 820
View All

Related Models For Sale

Used Chevrolet Tahoe
772 Great Deals out of 28,452 listings starting at $1,500
Used Chevrolet S-10
10 Great Deals out of 1,657 listings starting at $2,450
Used GMC Jimmy
288 listings starting at $1,995
Used Chevrolet Silverado 1500
2,290 Great Deals out of 155,163 listings starting at $1,395
Used Ford Explorer
936 Great Deals out of 73,995 listings starting at $750
Used Jeep Grand Cherokee
845 Great Deals out of 68,679 listings starting at $864
Used Ford F-150
2,690 Great Deals out of 212,354 listings starting at $1,000
Used Chevrolet Camaro
282 Great Deals out of 38,299 listings starting at $1,250
Used Chevrolet C/K 1500
1,049 listings starting at $2,000
Used Chevrolet Impala
793 Great Deals out of 34,384 listings starting at $799
Used Dodge Durango
299 Great Deals out of 24,115 listings starting at $1,500