Knowledgeable Ford person question?
On my heater control the temp control blows hot even when you turn it to cool on the temp control. The truck is a 2000 F-250 Superduty. I did not see a control device on the heater hose, so I as...
Forum Discussion
Bird Freak writes “I know my 04 has a valve under the hood on the evaporator case.”
Correct.
I had a ’97 which indeed had a vacuum operated valve on the heater core circuit, doesn’t mean EVERY vehicle Ford built has one.
Our 2003 F250 DOES NOT.
Our 2006 F250 DOES have the valve, so somewhere between ’04-’06 MYs Ford put the valve back in.. But even though Ford did put the valve back on it doesn’t mean it cuts off the hot water all the time.. Our ’06 the hot water valve closes ONLY on MAX A/C.. All other positions including normal A/C the valve is open allowing hot water to run through the core. And even then for whatever reason Ford decided when you use Max A/C position they would disable the blend door control to cold position.. Makes the Max A/C setting useless for anything other than fast cooldown..
Our 2003 has the most pathetic and lethargic A/C you could get and for those model years which do not have the valve it was a very popular “mod” to add the valve. I never bothered to make that mod but that A/C took easily 1/2hr of driving before the cab temps were reasonable in 90+ outside temps.
I highly suspect the OPs issue is most likely the blend door servo motor.. It is stuck or broken in heat position.
This part was not designed to be changed with the dash in place nor with the heat-A/C box in place.. Makes for a real challenge to remove in place.. It can be done but it will not be easy.. That is why I suggested to check the A/C clutch FIRST to ensure it is engaging.
With the setup Ford has it USES the A/C AND heater core to blend the air temp, if A/C is not working the result is hot air even when you set the control to cool and no A/C.. It is odd, but that IS one of the side effects I found out when the clutch on my 2003 started acting up..
Either Ford Truck Enthusiasts or The Diesel Stop may have MUCH better well informed information about how to troubleshoot and repair this problem than this forum from some of the off the wall answers I have been reading.
Correct.
I had a ’97 which indeed had a vacuum operated valve on the heater core circuit, doesn’t mean EVERY vehicle Ford built has one.
Our 2003 F250 DOES NOT.
Our 2006 F250 DOES have the valve, so somewhere between ’04-’06 MYs Ford put the valve back in.. But even though Ford did put the valve back on it doesn’t mean it cuts off the hot water all the time.. Our ’06 the hot water valve closes ONLY on MAX A/C.. All other positions including normal A/C the valve is open allowing hot water to run through the core. And even then for whatever reason Ford decided when you use Max A/C position they would disable the blend door control to cold position.. Makes the Max A/C setting useless for anything other than fast cooldown..
Our 2003 has the most pathetic and lethargic A/C you could get and for those model years which do not have the valve it was a very popular “mod” to add the valve. I never bothered to make that mod but that A/C took easily 1/2hr of driving before the cab temps were reasonable in 90+ outside temps.
I highly suspect the OPs issue is most likely the blend door servo motor.. It is stuck or broken in heat position.
This part was not designed to be changed with the dash in place nor with the heat-A/C box in place.. Makes for a real challenge to remove in place.. It can be done but it will not be easy.. That is why I suggested to check the A/C clutch FIRST to ensure it is engaging.
With the setup Ford has it USES the A/C AND heater core to blend the air temp, if A/C is not working the result is hot air even when you set the control to cool and no A/C.. It is odd, but that IS one of the side effects I found out when the clutch on my 2003 started acting up..
Either Ford Truck Enthusiasts or The Diesel Stop may have MUCH better well informed information about how to troubleshoot and repair this problem than this forum from some of the off the wall answers I have been reading.
