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2004 Chevrolet Tahoe Loss of coolant

Tiny
TOROVIEJO1979
  • MEMBER
  • 2004 CHEVROLET TAHOE
  • 5.3L
  • V8
  • RWD
  • AUTOMATIC
  • 97,000 MILES
The possibility that the coolant is either leaking through the intake manifold gasket into the exhaust, or a cracked head and the coolant going that route has got me very worried. The oil is clear, no signs of 'water' contamination, and the spark plugs are also clean. The dealer did a pressure test on the coolant reservoir and no loss of pressure there. After a 2 hour drive, there are no leaks under the vehicle.
After a couple of days, I have to add about 2 pints of coolant. Help!
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Tuesday, June 3rd, 2014 AT 7:34 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The whole system will have to be pressure tested unless your coolant bottle always goes down. It may have been overfull. If they tested the bottle it should have donethe whole system. Here is another case of this so maybe have the valve covers pulled to see if this may be it. But the coolant test shold have been done on a warm engine.
Hey guys just ran into this ours turned out to be coolant getting into crankcase thru the heads around the oildrain back holes or where the head bolts go thru remove valve covers and look for a clean area coolant is coming thru the poors in the heads very slowly. Customer probaly never noticed
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Tuesday, June 3rd, 2014 AT 7:53 AM

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