Question about 1999 GMC Yukon
I need a parts diagram for the tranny coolant lines running from the radiator to the transmission.
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Posted on Jan 02, 2017
Is the line before and after the connector steel? If you can cut the leaking section out w/ a hack saw, u can slip a section of gas line over the trans cooling line, and put a clamp on both ends, quick cheap fix that will last a long time.
Posted on Mar 19, 2009
I you did it by yourself is better to tell the dealer that you truck has that problem dont tell them that you did that because you may have voided the warranty.
Posted on Jul 18, 2009
Most likely the intake manifold has a broken gasket or iteslf is broken.
take it to a shop and have them diagnose it by checking for HC's in your coolant. If there are non present, then it could be inside of the timing cover or the intake. If there are HC's present, you will need a new Head, Engine or just Head Gaskets, but if it's over 150,000 miles, you may want to just buy an engine if that's the case. You can't repair a high mileage engine with new top end components because it will "**** out" or ruin the bottom end shortly after installation.
Good luck! Hope that helps.
P.S. - I have mroe GM's come in with that same symptom than any other vehicle. After your repairs are complete, get rid of the DEXCOOL and go with a good, green antifreeze. It works much better than DEXCOOL.
Kevin, ASE Certified
Posted on Sep 12, 2009
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