F150 temp control

[Elmer Fudge]

The temp control knob is turned all the way to cold but hot air blows out of the vents, even though the air conditioner is in good working order, i suspect the cold air vent is stuck shut.<br />How can i gain access to manually rectify this uncomfortable dilemma??

 

[SpinnerBait_Nut]

Re: F150 temp control

Sounds like the hot water valve is not closing.<br />It will be inline on one of the small heater hoses.<br />You will see a valve with either a cable hooked to it or a small vacuum canister sitting there.<br /><br />If this valve does not close, then it just keeps letting hot water into your heater core and blows hot air where ever you have the control set.

 

[Elmer Fudge]

Re: F150 temp control

Thanks Spinner, do i have to remove the dash to get to the hot water valve?

 

[DJ]

Re: F150 temp control

Look for broken vacuum lines under the hood.<br /><br />The "blend door" is vacuum operated. Without it, you'll get hot or cold air only.

 

[SpinnerBait_Nut]

Re: F150 temp control

Originally posted by Elmer Fudge:<br /> Thanks Spinner, do i have to remove the dash to get to the hot water valve?

No, it should be out under the hood where the 2 heater hoses are.<br /><br />Is your unit switching from defrost to vent to floor ok?

 

[Elmer Fudge]

Re: F150 temp control

Posted by SBN:"Is your unit switching from defrost to vent to floor ok?"<br /><br />yes the selector for the ac,defrost and floor works fine.<br /><br />Hi DJ, I did not see any broken or loose vacuum lines under the hood, i am quite certain that the blend door is somehow stuck,the service manual which i have does not show how to gain access to that part