Inconstant heat?
Thread Starter
|
Member
Joined: Apr 2004
Posts: 17
Likes: 0
From: Delaware
Inconsistent heat?
I have a 2004 F150 FX4 Supercrew.
Has anyone out there hade any problems with the interior temperature dial?
I recently took a trip to the Adirondacks, on my way home I had the heater on and I constantly had to adjust and readjust the interior temperature dial to keep a comfortable temperature. It seems that if the dial was set to just left of the top center, the temp was either too hot or too cold. I could not seem to set the dial in this area and have the temperature constant.
Mark
Has anyone out there hade any problems with the interior temperature dial?
I recently took a trip to the Adirondacks, on my way home I had the heater on and I constantly had to adjust and readjust the interior temperature dial to keep a comfortable temperature. It seems that if the dial was set to just left of the top center, the temp was either too hot or too cold. I could not seem to set the dial in this area and have the temperature constant.
Mark
Last edited by yomann; Oct 28, 2004 at 06:35 AM.
Senior Member
Joined: Sep 2004
Posts: 3,115
Likes: 0
From: Winnipeg, Manitoba
As I'm sure you're aware, the entire HVAC system is controlled by vacuum. But unlike the old days the hoses aren't connected to the switch.
The **** nowadays is essentally a reostat that controls the voltage value to a vacuum module that in turn sends the correct vacuum signal to the motor on the blend door. This is how temp is controlled.
What I suspect is happening is that either the voltage in this system is out of range at the **** or at the module. There could also be a vacuum leak in the hose, connections, or at the module itself. Any one or combination of these conditions would cause the inconsistant temp.
The **** nowadays is essentally a reostat that controls the voltage value to a vacuum module that in turn sends the correct vacuum signal to the motor on the blend door. This is how temp is controlled.
What I suspect is happening is that either the voltage in this system is out of range at the **** or at the module. There could also be a vacuum leak in the hose, connections, or at the module itself. Any one or combination of these conditions would cause the inconsistant temp.