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View Full Version : Heat slowly warms truck after being on for a while


mack048
Nov 24, 2009, 11:24 AM
03 ford expedition 4.5, when the truck has been sitting over night after the engine warms up it takes a long time for the heat to actually feel warm coming out of the vents

TxGreaseMonkey
Nov 24, 2009, 01:15 PM
Consider back-flushing the heater core and, possibly, the whole cooling system. If you haven't changed the coolant every 30,000 miles, there may be corrosion in the heater core. Refill with a 50/50 mixture of Zerex G-05 (HOAT) and distilled water. Also, check/replace the thermostat.