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You have coolant in the upper plenum in your 1997 Safari awd Where can this be coming from?
Wiki User
∙ 17y ago
The air intake manifold is heated with coolant from the engine block. There are seals between the block and the intake plenum/manifold. GM had problems with these seals becoming brittle and leaking. I had this occur on my 1997 safari. The coolant ran into the engine oil and caused the Hydraulic lifters to stick when cold(sounds like bad valve). I was able to add stop leak to the radiator and this resealed the intake seals that were leaking. I was then able to add 1 quart of "marvel mystery oil" (high detergent oil) to my crankcase and run it for a couple of days. Once the lifters were cleaned up I then drained the oil and replaced. That was 100,00 miles ago and all is well no leaks no lifter problems. GM Dealer quoted $500.00 approx to rrpalce the intake seals. Hope this helps. PS Marvel Mystery oil is available at Autozone/Advance auto etc. Also for any that worry about using cooling system leak sealer you may be amazed that some auto manufaacturers actually add this to the coolant during final vehicle assembly ...to reduce cooling system leaks and hence warranty cost. Virago96577@aol.com The air intake manifold is heated with coolant from the engine block. There are seals between the block and the intake plenum/manifold. GM had problems with these seals becoming brittle and leaking. I had this occur on my 1997 safari. The coolant ran into the engine oil and caused the Hydraulic lifters to stick when cold(sounds like bad valve). I was able to add stop leak to the radiator and this resealed the intake seals that were leaking. I was then able to add 1 quart of "marvel mystery oil" (high detergent oil) to my crankcase and run it for a couple of days. Once the lifters were cleaned up I then drained the oil and replaced. That was 100,00 miles ago and all is well no leaks no lifter problems. GM Dealer quoted $500.00 approx to rrpalce the intake seals. Hope this helps. PS Marvel Mystery oil is available at Autozone/Advance auto etc. Also for any that worry about using cooling system leak sealer you may be amazed that some auto manufaacturers actually add this to the coolant during final vehicle assembly ...to reduce cooling system leaks and hence warranty cost. Virago9577@aol.com
Wiki User
∙ 17y ago
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