Yukon heating issue

Asked by CM Dec 22, 2018 at 09:22 AM about the 2003 GMC Yukon SLE 4WD

Question type: Maintenance & Repair

The other day my dash said "low coolant
level". I filled it back up and fixed the leak,
connector at rear heater box. Now at idle i
have no heat, i get heat only when driving or
revving the engine. My rear heat blows cold
no matter what and has for awhile now. Any
ideas?

1 Answer
64,570

firebird338 answered 5 years ago

Try bleeding air from system like this remove cap from overflow tank fill with antifreeze to full mark leave cap off and start vehicle and let idle you will notice level in tank start to rise this is normal once thermostat starts to open level in tank will drop add more antifreeze to full mark then put cap back on.

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