2011 Yukon XL coolant loss

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Dec 17, 2018 | 12:58 AM

#11

CathedralCub

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Quote:

Originally Posted by eroemer44

Rear heater use is not consistent. Sometimes it is on, sometimes not. Even in front, sometimes dual zone sometimes not. Where would I check for loss related to rear heater?

Try this: Keep the rear controls set to cold and off and don't change it for a few days. See if your coolant loss changes.

The rear heater core is in a panel on the passenger'* side of the cargo area. Coolant lines are along the right side of the body between the frame rail and the outer edge of the body.

Quote:

Originally Posted by eroemer44

I don’t see any visible leaking around water pump and no tracer dye residue either. Is there a specific place to check for seepage around shaft seal?

It'* a pain on these. The pulley obscures it. You might be able to see it with a scope. You'd want to see where the shaft comes out of the housing behind the pulley, or at least the housing under the same would have some wetness and/or residue and/or dye.