A/c cool but not cold!??
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A/c cool but not cold!??
04 fx4 f150 scab-checked it the other day with an ambient temp around 90 f, and it had been blowing on max. for a while, and I would guess I am only getting 50 or 60 degree air from the vents-with black paint this just isn't cold enough to come off the max setting. It was showing around 40psi on the suction side. This seems high for R134??? any a/c expert opinions???
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The AC vents on an F150 come right beside the heater core. In the summer, when the hot coolant is flowing through the heater core, it is also heating up the cold air coming into the vents. I have heard of some people putting in a valve to shut off the flow of hot coolant to the heater core in the summer and reporting better AC. I have not tried it, but it makes sense that it would work.
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Many reasons A/C doesnt blow cold. You also have to factor in the 30% rule. Max A/C sucks air from the inside of the truck, thus cooling already cooled Air, So Something is wrong.
I would try to move More Air past the condensor, So On the freeway, does your A/C blow cooler?? If so, your fan isnt moving enough Air past at low speeds. The Fan clutch might be bad. Try setting a fan in front of the radiator, on high.
The next piont is arguable, but not for me, The Air dryer, has roughly a 4 year life span, depending on the climate you live. In Ohio, it is reccomended 4 to 5 years... Down south maybe 3 to 4. When this gets saturated with moisture, you system looses proper cooling ability. The Air dryer is the alluminum can on the right side of engine, inline, ( It also has other names) Everytime I go up to the parts store and ask for an air dryer for a certain vehicle, I get the right part so... There is also an inline filter, that can get plugged up???
My bet is , it has something to do with the fan, and Air movment, thats if it is properly charged... Good luck
I would try to move More Air past the condensor, So On the freeway, does your A/C blow cooler?? If so, your fan isnt moving enough Air past at low speeds. The Fan clutch might be bad. Try setting a fan in front of the radiator, on high.
The next piont is arguable, but not for me, The Air dryer, has roughly a 4 year life span, depending on the climate you live. In Ohio, it is reccomended 4 to 5 years... Down south maybe 3 to 4. When this gets saturated with moisture, you system looses proper cooling ability. The Air dryer is the alluminum can on the right side of engine, inline, ( It also has other names) Everytime I go up to the parts store and ask for an air dryer for a certain vehicle, I get the right part so... There is also an inline filter, that can get plugged up???
My bet is , it has something to do with the fan, and Air movment, thats if it is properly charged... Good luck
Sick 'n Tired
Joined: May 2006
Posts: 2,969
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From: League City, TX
04 fx4 f150 scab-checked it the other day with an ambient temp around 90 f, and it had been blowing on max. for a while, and I would guess I am only getting 50 or 60 degree air from the vents-with black paint this just isn't cold enough to come off the max setting. It was showing around 40psi on the suction side. This seems high for R134??? any a/c expert opinions???
Yes, some folks have had some luck cutting off the flow to the heater core, but that could cause other problems. When you cut that flow off the coolant left in the core will stagnate and could corrode your heater core resulting in a costly replacement.
My opinion is that this is only a band-aid to a different problem. The actual problem could be your blend door actuator motor. Evidently, the actuator motor gets outta whack and doesn't adjust the blend door correctly causing too much heater core air to mix in (thus cutting off the flow to heater core helps...but not cures). You can try the below procedure to recalibrate the blend door actuator, if you give it try report back and let us know if it helped.
Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process
The purpose of the cold boot process is to allow the EATC or EMTC module to re-initialize and calibrate the door actuators. To carry out the cold boot process, follow the steps below.
- Turn the ignition switch to the OFF position.
- Disconnect the EATC or EMTC module electrical connectors.
- Wait one minute .
- Connect the EATC or EMTC module electrical connectors.
- Turn the ignition switch to the ON position.
- Select any position except OFF on the EATC or EMTC module. The EATC or EMTC module will now initialize and calibrate the mode doors. Calibration of the mode doors will take approximately 30 seconds .
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Sick 'n Tired
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From: League City, TX
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How long have you had this '04? Since new and it's just starting to fail? or bought it used not too long ago and as far as you know it's always been this way?
Yes, some folks have had some luck cutting off the flow to the heater core, but that could cause other problems. When you cut that flow off the coolant left in the core will stagnate and could corrode your heater core resulting in a costly replacement.
My opinion is that this is only a band-aid to a different problem. The actual problem could be your blend door actuator motor. Evidently, the actuator motor gets outta whack and doesn't adjust the blend door correctly causing too much heater core air to mix in (thus cutting off the flow to heater core helps...but not cures). You can try the below procedure to recalibrate the blend door actuator, if you give it try report back and let us know if it helped.
Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process
The purpose of the cold boot process is to allow the EATC or EMTC module to re-initialize and calibrate the door actuators. To carry out the cold boot process, follow the steps below.
Yes, some folks have had some luck cutting off the flow to the heater core, but that could cause other problems. When you cut that flow off the coolant left in the core will stagnate and could corrode your heater core resulting in a costly replacement.
My opinion is that this is only a band-aid to a different problem. The actual problem could be your blend door actuator motor. Evidently, the actuator motor gets outta whack and doesn't adjust the blend door correctly causing too much heater core air to mix in (thus cutting off the flow to heater core helps...but not cures). You can try the below procedure to recalibrate the blend door actuator, if you give it try report back and let us know if it helped.
Electronic Automatic Temperature Control (EATC) Module and Electronic Manual Temperature Control (EMTC) Module Cold Boot Process
The purpose of the cold boot process is to allow the EATC or EMTC module to re-initialize and calibrate the door actuators. To carry out the cold boot process, follow the steps below.
- Turn the ignition switch to the OFF position.
- Disconnect the EATC or EMTC module electrical connectors.
- Wait one minute .
- Connect the EATC or EMTC module electrical connectors.
- Turn the ignition switch to the ON position.
- Select any position except OFF on the EATC or EMTC module. The EATC or EMTC module will now initialize and calibrate the mode doors. Calibration of the mode doors will take approximately 30 seconds .
Could this cause the air coming from the vents to go from cold, to not so cold, back to cold without touching the controls?? or is that a freon issue?
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