AC & Heater complaints by model year
Which parts fail
Components named in complaints (air conditioning, heater, defroster, HVAC controls).
Mileage when the problem started
What owners report
The heater and defroster failed to generate heat. No events leading up to failure. This fall when we needed the heat and window defroster just luke warm air was coming out. The intake hose to the heater was hot the out take hose was cold. This failure causes a major safety issue because the front window will not un-fog and the ice and snow will not melt off the front window. The driver can not see out of the front window. There is no warning to this problem. Research this problem on the web and there are numerous other people and vehicles with the same problem. It appears to be caused dex-cool coolant. This web site http://www.geocities.com/b_gillie/dexcool_problems.html has more information on this problem.
The first problem is that our car was not fully painted, you can see that primer in large areas all over that body of the car. Second problem is the back cargo door will not lock. Third problem is the electronic sets on driver and on passenger side will not move and are stuck in the same position, also seat warmers do not work. The fifth problem is that the transmission is leaking fluid.
I own a 2001 Chevy Blazer. Lost heat in jan. 2004. Took it to dealer. They flushed the system and replaced thermostat. 3 to 4 weeks later the same thing . They cleaned out filter. 30 days later it happened again. They said the filter was clogged again. As the weather warmed up I didn't need the heat. As the colder weather approached again, used the heat 2 times and the 3 rd time the heater core went out completely. When I returned to the dealer there were about 10 other blazers there for the same reason. They say it is our problem now. Now without heat and have to keep air conditioner on and still smell coolant inside the vehicle. If there is that many vehicles with the same problem then , I would say it was defective parts used. To replace the part is almost $200. And with labor over $600. To have to put out that kind of money on vehicle that is only 3 years old is wrong for consumers. …
2001 Chevrolet Blazer developing various problems.** answer required***. The differential pinion shaft seal was leaking. When it rained the transmission slipped, the cigarette lighter was inoperative, the lighter socket was replaced. The heater was not blowing hot air, the service engine soon light illuminated, the brake light was inoperable, the directional switch was replaced. The front rear rotors were rotted, the rear wheel well molding was coming undone, the drivers window was leaking water. The vehicle was not shifting properly, the alternator was replaced, the tail gate glass would not lock, the driver door did not shut easily, the battery was replaced. The headlights were inoperable. The driver seat recliner was replaced, the retractor in the seat belt was reset. The rear window molding was loose. The oil cooler lines were leaking.
The handle that allows you to recline the seat broke off flushed with the seat, this happened to both the driver and passenger seats in June 2005. The hood will not pop up when the lever was pulled until one banged on the grill or the hood in certain spots, which just started in March of 2007. The gas mileage dropped from 20 mpg to 16 mpg within 6 months. The back glass stuck and was hard to open, started in 2006. When turning on the air conditioner (A/C ) the car had no power, I have to turn it off when accelerating on the interstate or on hills. If the cruise control was set it kicked off when the A/C was on. When I needed to stop quickly the brakes failed, and felt a grinding sensation through the pedal, but the mechanic changed the brakes and checked the rotors, but hasn't found any problem. Suspected a defect somewhere in the brake system\ as of 2005. …
While driving 25 MPH the transmission failed. The dealer was notified about 7 months ago but they could not duplicate or correct the problem. The dealer was notified of the shruddering and slippage of the transmission at 23863. The front differential pinion seal leaked, the check light was replaced due to the malfunctioning switch, the brake light had become inoperative due to an open circuit, the heating seat was inoperative, there was a rattle in right front suspension, the transmission had no reverse, and there was hard shifting into the forward gears.
Dt: the contact complained about multiple problems. While driving at 40 MPH on a damp road the driver's side wheel came off. He was able to steer the vehicle safely to the curb. The vehicle was towed to a mechanic, who replaced the upper ball joint on the driver's side and realigned the wheels. Later, he heard a grinding noise coming from the front of the vehicle. The mechanic determined that the other ball joints needed to be replaced. However, they have not been replaced. Also, the windshield fogged up. The mechanic stated the heater core broke and the coolant was leaking. The heater core was replaced. N addition, the vehicle had problems starting. The mechanic had to replace the fuel pump and fuel injector. The starting problem has not returned.
The air conditioning compressor was replaced by the dealer on Friday June 25. After the repair the vehicle was driven approximately 20 miles that day. On the following day the vehicle was driven an additional 25 miles and returned home. After leaving the vehicle parked in my driveway, I was summoned from my home by a neighbor who reported that the vehicle was on fire. We extinguished the fire in the engine compartment and had the dealer remove the vehicle for repair. The dealer informed me that the fire was not caused by their repair. Damage to the under hood equipment required $ 4,500 in repairs.the repair work took over four weeks.
Frequently asked questions
Which Chevrolet Blazer years have ac & heater problems?
By NHTSA complaints, the 1996 (38), 1999 (18), 1995 (12), 1997 (12) and 1998 (12) model years. AC & Heater complaints make up 3% of all complaints for the 1996.
Is there a recall for Chevrolet Blazer ac & heater problems?
No. NHTSA lists no a/c & heater recall for any Chevrolet Blazer model year. A widespread problem may still be covered by an extended warranty or a manufacturer service bulletin, so ask a dealer.
At what mileage do Chevrolet Blazer ac & heater problems start?
Across all years, half of the complaints with a recorded mileage happened before about 85,000 miles; 21% happened before 50,000 miles.
What part fails most often?
Owners most often name the appliance › air conditioner (48 mentions), followed by the defroster/defogger/hvac system › heater core (35).
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.