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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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While my truck is idling the heat works fine. When I'm

Customer Question

While my truck is idling the heat works fine. When I'm moving all I get is cold air in all positions; heat, panel, defrost. ???
Submitted: 10 months ago.
Category: Ford
Expert:  AZTechBrian replied 10 months ago.

Hello. That sounds like a bad thermostat. Did you replace it when you did the water pump?

Customer: replied 10 months ago.
I did not replace thermostat. My temp gauge is functioning properly so I assumed thermostat was good.
Expert:  AZTechBrian replied 10 months ago.

I think your thermostat is stuck open. That is definitely where I would start. When you start your truck does it seem take a long time to reach operating temperature? Does it even reach normal operating temperature?

Customer: replied 10 months ago.
The truck reaches normal temp in 7 to 10 minuets (roughly) at idle. Changing the thermostat is an easy enough procedure but, the one that's in there is only about 4 years old.
Expert:  AZTechBrian replied 10 months ago.

Was this an issue before you replaced the water pump as well?

Customer: replied 10 months ago.
yep
Expert:  AZTechBrian replied 10 months ago.

Ok. when your driving and the air is blowing cold, what does the temperature gauge on the dash do? Does it drop?

Customer: replied 10 months ago.
Temp gauge holds steady.
Expert:  AZTechBrian replied 10 months ago.

so the engine temp does not drop when you are cruising and the air is blowing cold? Where is the gauge? middle? just past?

Customer: replied 10 months ago.
middle
Expert:  AZTechBrian replied 10 months ago.

At idle, does it actually blow as hot as it should, or does it just blow warm?

Customer: replied 10 months ago.
I'll throw a new thermostat in and get back to you. The wife is nagging, so I gotta go. It does blow as hot as it should at Idle
Expert:  AZTechBrian replied 10 months ago.

Ok. Let me know. If it's not the thermostat then I would suspect a restricted heater core, although the symptoms point more toward a thermostat but if it were the thermostat then the engine temp should drop as the air blows colder.

This is rather bazaar