1999 F150 5.4l NO HEAT HELP
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1999 F150 5.4l NO HEAT HELP
I have a 1999 F150 5.4l. The heater stopped blowing cold air. I verified the blend door is operating correctly. I flushed the heater core....had a very small amount of brownish water before it went completely clear. I flushed it from both sides. I flushed the motor and have clear good flow throughout. I verified the thermostat is operating correctly. I noticed after the motor warms up the inlet side hose to the heater core only warms up half way. Near the motor it is warm....near the heater core inlet it is cold. The return hose is completely cold. Has anyone experienced a water pump failure that would cause this???? Help I'm at a loss!!!
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Join Date: Oct 2002
Location: St. Louis (Out in the woods)
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A couple summers ago my truck starting to have the temp hand start raising slowly if I was in a drive through or in traffic for a few minutes, you could actually rev it up a little and the hand would start coming back down. Replaced water pump and only one impeller was left and it was about gone. Pump was original with over 230,xxx miles on it.
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