Coolant leak?

[bramas02]

I seem to have a coolant leak in my 99 yukon. I might have 2 because there are 2 different wet spots under the truck when I park it. At first I thought it might be the water pump but I dont see any water coming out the weep hole. And The other might be the heater core but the coolant does not seem to be coming out the drain on the fire wall. the one wet spot is on the driver side bank in the front and the other is on the passenger rear bank. I'm thinking I could have bad head gaskets or warped heads is there anything I should look for when I tare into it this weekend?

[pm26]

Have you checked the coolant overflow botle? Sometimes the plastic welded seems along the bottom leak slowly. What about the radiator itself? Any greenish white powder deposits on the core? These would be the coolant leak spots.

[bowtie_pasta]

The location of the drips may be misleading if you have skid plates under your engine. It's best to remove those then see if you can pinpoint the leak.

 

Also check your intake manifold gasket as that is another failure point.

[02 Silverado Z71]

Intake manifold gaskets seeping coolant.

 

Guaranteed.

[bramas02]

Intake manifold gaskets seeping coolant.

 

Guaranteed.

 

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Thanks guys that makes more sense than what I was thinking.

[Norseman]

Is it the 5.7 or 5.3 engine?

[ken1mod]

Is it the 5.7 or 5.3 engine?

 

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I have had very good luck with the gm product called "seal tabs". this was used in cadillac engines for many years and is harmless. most dealers stock it.

 

ken

[AirForceAngler]

That is an old body style Tahoe, so it is going to be a 5.7. In '99 they had problems with intake and head gaskets. While you've got the intake off to do the leaking intake gaskets, I'd go ahead and have the head gaskets replaced also.