Coolant Leaking problems of the 2004 Chevrolet Silverado 1500

Vehicle is leaking coolant with no apparent cause. No external leaks what so ever. Took it to a mechanic that determined it was a cracked head caused by a bad castech head. There is coolant leaking into my oil because of this.

The contact owns a 2004 Chevrolet Silverado 1500. While driving 65 mph, the temperature gauge indicated that the vehicle was overheating. The vehicle was immediately taken to the closest dealer where the coolant was flushed and replaced. The failure recurred. The vehicle was taken to an independent mechanic where it was diagnosed that the cylinder head was leaking coolant and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 155,000.

I have had a slow coolant loss recently without and leak visable. Found out its my heads that need to be replaced due to cracks. Read a lot of articles of people with the same problem. Seems to me gm should be responsible for installing horrible heads.

Anti-freeze always low, but no signs of leakage. Due to bad heads on vehicle causing coolant to enter the engine causing slug damage, which destroyed the valves. This is not a wear and tear problem. This is a manufacturer issue that they need to take care of. Gm knew that their manufacturer of the heads knew it was an issue and posted a bulletin, but refuses to fix the issue and resulting in us taking it to a dealership to find out the engine needs to be replaced. Contacted gm, on June 7, 2014 after getting the car back from the dealership, to help with the replacement costs and got no help whatsoever due to age of vehicle with less than 100,000 miles. I even asked if they would pay for the engine if I paid for the labor to have it installed. They refused. Please gm own up to your responsibilities, stand by your product, and fix the issues at hand.

On July 21 my 2004 Chevrolet silverado overheated and had a sudden loss of power. The problem was a direct result of a cracked head that leaked all of the engine coolant into the oil pan. This defect is a known defect to gm per a technical service bulliten that was issued in 2007. The bulliten number is #06-06-01-019b and covers engines manufactured from 2001 to 2006. Chevrolet has offered to only replace the cracked heads which does not address the issue of the coolant that entered the oil system which can and will cause severe safety issues later in the vehicles life.

- the contact's vehicle had a coolant leak and cracked heads. The contact stated that general motors wasaware of this problem. There was a service bulletin already posted. The contact stated that he took vehicle into dealership for a pressure check, and dealership found that all of the leaks were on the inside of the vehicle. The contact stated that general motors was refusing to service his vehicle because itwas out of warranty, even though they have service bulletin released regarding this problem. Updated 01/31/07.