Coolant Leaking Problems of GMC Sierra

The contact owns a 2007 GMC Sierra 1500. While driving 65 mph, the contact stated that the vehicle shut off without warning. The vehicle was towed to an independent mechanic who informed the contact that the cylinder heads were cracked and leaked coolant into the engine. The vehicle was not repaired. The manufacturer was not notified of the incident. The approximate failure mileage was 180,000.

See all problems of the 2007 GMC Sierra 🔎.

Took vehicle in for new brakes and coolant leak. No complaint about brakes, but complaint about coolant leak. Coolant leak issue is connected to gm TSB 06-06-01-019b and affects castech 706 cylinder heads. The coolant is leaking into the heads because of a known porosity issue. My engine will have to be replaced if the problem is not addressed because of glycol contamination. Gm dealer said to just "keep an eye" on it. A second, independent mechanic, did confirm the coolant leak is not external and my engine will fail if the heads are not replaced. This appears to be a known issue with gm for manufacture years 2001-2006 on the vehicles with the 5. 3l engine.

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Faulty castech heads are leaking coolant into engine oil. Gm is aware that the 5. 3l v8 engines have faulty heads, and they refuse to place a recall to fix the problem. It is not right to not stand behind your product. The repair costs are in the $5000 range.

My vehicle began losing coolant. I took the vehicle to a mechanic, who has told me that the cylinder head is cracked and leaking. This is due to faulty casting on the cylinder head. The coolant is leaking into the heads, and causing the oil to lose it's ability to protect the engine from wear. I have seen that there are many people with this issue, and it is a very costly repair.

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The consumer has been experiencing problems with windshield wiper motor. When turning the windsheild wipers on, the motor makes a lot of noise. The manufacturer has yet to be contacted. Vehicle also has the following problems: engine coolant tank and brake master cylinder are leaking, brakes and fuel pump are noisy, and passenger side defroster does not flow enough air.

See all problems of the 1998 GMC Sierra 🔎.