Mechanics

CHEVROLET UPLANDER HEATER PROBLEM

2007 Chevrolet Uplander • 130,000 miles

Which holes do I use to flush heater core
changed thermostat still no heat
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Guest
November 29, 2012.



Before flushing and with engine at normal operating temp. Check both heater hoses to see if they are hot---they should be. If one is hot and the other is not, suspect a clogged heater core.
Post results and let me know if more assistance is needed.

Disconnect both heater core hoses at the firewall. Use a water hose to run water (at a high rate of speed) through the heater core. Doesn't matter which hose you use as the inlet or outlet during flusing. I usually flush through both hoses (one at a time).

Freemba
Dec 2, 2012.