Heater blowing cold air
devhrp
10-12-2008, 01:24 PM
My heater blows hot air for about 30 seconds then cold air. We have replaced the thermostat. Any helpful information?
brcidd
10-14-2008, 09:19 AM
Most common failure mode for lack of heat is low coolant level- so how is your coolant? also check the water shut-off valve on HVAC module- what yr Astro?
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