Hot...Then Cool Temperature
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New User
Joined: Jan 2004
Posts: 15
Likes: 0
From: Virginia
Hot...Then Cool Temperature
The heater in my truck ('97 F150; 4.6L; 93K miles) will go from blowing hot air to cool air without touching the temperature ****.
If I turn the control **** to "OFF" for a minute or two and then back to "Panel/Floor"or "Floor" the temperature goes back to being hot again.
The needle is 1/4 inch above the bottom line of the temperature gauge and remains there no matter what temperature is coming from the vents.
Any thoughts on what may be causing this?
TIA...
If I turn the control **** to "OFF" for a minute or two and then back to "Panel/Floor"or "Floor" the temperature goes back to being hot again.
The needle is 1/4 inch above the bottom line of the temperature gauge and remains there no matter what temperature is coming from the vents.
Any thoughts on what may be causing this?
TIA...
Post Fiend
Joined: Feb 2000
Posts: 11,496
Likes: 6
From: Kansas
The system is topped off with coolant?
I found this bit of info posted by user vaders,
"The newer f150s don't have a valve in the heater hose to control the heat. Heat is controlled by an air damper in the heater box. The damper is controlled by a small servo motor unit on the bottom of the box and the position of the servo is controlled by the variable resistor connected to the temperature control **** on the dash. If you don't have heat, check the servo motor first. It's easy to get to and easy to replace."
This is a new one to me.
Hopefully we'll get you fixed up.
I found this bit of info posted by user vaders,
"The newer f150s don't have a valve in the heater hose to control the heat. Heat is controlled by an air damper in the heater box. The damper is controlled by a small servo motor unit on the bottom of the box and the position of the servo is controlled by the variable resistor connected to the temperature control **** on the dash. If you don't have heat, check the servo motor first. It's easy to get to and easy to replace."
This is a new one to me.
Hopefully we'll get you fixed up.
Last edited by Ultramagdan; Jan 25, 2004 at 05:14 PM.
