Defogger Problems of GMC Jimmy

Drive an 1998 GMC Jimmy with around 172,000 miles on it (I know this is a lot of miles). Had the local gm dealer work on my rear defroster (one of the clips fell off). After receiving the vehicle back from the dealer I turned my defroster on about two weeks later. The back window exploded like a shotgun after about 15-20 seconds. Dealer says rear defroster voltage regulator must have went bad. I argued that a fuse should had blown before an explosion took place. Gm complaint department also disagrees, saying that the vehicle is old and things like this happen. Luckily, no one was standing by the rear window when it exploded because it probably would have killed them. If I'm wrong tell me I'm wrong but I believe gm is responsible for no only replacing the window but fixing the rear defroster voltage regulator. I hope this is an isolated case but maybe by reporting this I can prevent someone from getting hurt (including a gm technician).

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Vehicle suddenly accelerated when idiling. Dealer has been contacted, and has replaced fuel injectors. Please provide further details. The heating system malfunctioned due to heating core failure. The a/c was not blowing warm air. There was a clicking noise from the engine area because the power steering pump was leaking fluid. The vehicle leans to the left due to torsion bar out of adjustment. Front left and right axle seals were leaking. Transmission was leaking. Back window had air leak. The rear wiper sticks due to wiper motor failure. Front end makes clunking noise due to ball joint failure. There was clunk noise when shifting into gear due to rear d-shaft and u-joint failures. The intake gasket was leaking and was replaced. The throttle sticks. The serpentine belt failed and was replaced.

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This has bee an ongoing problem with dealership and there service department I have also contacted GMC about this . If someone could help me out. I would like to speek to someone to find out what I can do please call me at work 989-793-5900 or home 989-893-4354 so I could explain all of the problems we have had thank you. No safety defect mentioned.

Consumer complained that the heater blows cold air, heater core clogged leaking, coolant leaking onto floor, and muddy coolant, a/c was leaking, a/c fan has power surge from high speed to low, a/c compressor was replaced.

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Auto transmission in twice before failed,battery leak damaged elec sys, rear defog stopped working (glass had to be replaced), dealer unable to stop front suspension popping noises, pass seat recliner handle keeps breaking off.

Heater failed.

Consumer stated that the air conditioner (a/c) is not cooling, leakage at the compressor and evaporator, leaking water into the floor, and the a/c fan intermittently has power surge from high to low by itself, heater blews cold air from heater core.