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Old 07-25-2013, 10:32 AM   #1
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F150 ac


Cant seem to figure this out, my truck will randomly start to blow warm air. It has been evacuated and replaced FOV and weight charged. Sometimes regardless of time of day, the ac works without issue. But other times you can get in and it wont cool past 50 degrees.

When it does this, the low side is always cold and sweating as it should be and the clutch is still engaged? Its not like the clutch is cycling out.

Thoughts?

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Old 07-25-2013, 01:52 PM   #2
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What year probably a temp blend door actuator if its a newer truck

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Old 07-25-2013, 02:02 PM   #3
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Originally Posted by cjm94 View Post
What year probably a temp blend door actuator if its a newer truck
2008 and sorry forgot to say the b door motor as been replaced.
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Old 07-25-2013, 04:44 PM   #4
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Is it dual zone they have two. One for each side. Could be a bad actuator right away. If it was plugged in before it was bolted down its junk it ruins the position sensor. I have seen the blend doors break loose. The control head could be bad but not real common.
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Old 07-25-2013, 04:50 PM   #5
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Originally Posted by cjm94 View Post
Is it dual zone they have two. One for each side. Could be a bad actuator right away. If it was plugged in before it was bolted down its junk it ruins the position sensor. I have seen the blend doors break loose. The control head could be bad but not real common.
No dual zone

Was not plugged in prior to install
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Old 07-25-2013, 07:07 PM   #6
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Hard to say without looking at it. Sounds like an actuator issue.
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Old 07-25-2013, 10:52 PM   #7
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sweating as it should be and the clutch is still engaged? Its not like the clutch is cycling out.

Clutch not cycling means system goes into overload and shuts off. Pressure releases, it cycles back to norm.
CLUTCH MUST CYCLE. Period.
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Old 07-25-2013, 11:06 PM   #8
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sweating as it should be and the clutch is still engaged? Its not like the clutch is cycling out.

Clutch not cycling means system goes into overload and shuts off. Pressure releases, it cycles back to norm.
CLUTCH MUST CYCLE. Period.
OK sounds great, what do I look for?
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Old 07-26-2013, 12:03 PM   #9
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What is the rh, ambient air and the discharge air temp? You probably have a variable displacement compressor and they do not cycle off and on.
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Old 07-26-2013, 12:09 PM   #10
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What is the rh, ambient air and the discharge air temp? You probably have a variable displacement compressor and they do not cycle off and on.

We are in the mid 90's here in Houston, seems to do this more on the very hot days with high humidity.

Left out this morning at 89 degrees out and had about a 44 degree discharge temp. No issues did not start to blow warm.

Its so random but appears to do it more on the very hot days which would be high humidity, high temp.

When it starts acting up, the discharge temp will rise to 50.

2008 F150 Lariat 5.4
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Old 07-26-2013, 02:17 PM   #11
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50 outlet temp may be normal on high humidity and temperature days.

Need to make a note of the conditions when it won't get below 50.
Ambient air temp
RH
Actual outlet temp.
Are you idling or stuck in traffic when this happens? Low air flow over the condenser will give warmer outlet temps.
Did you change temperatures? Check blend door or actuator
Pop the hood. Is the low side of the system freezing? Condensation and cold is normal, not freezing.
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Old 07-26-2013, 02:39 PM   #12
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Quote:
Originally Posted by 47_47 View Post
50 outlet temp may be normal on high humidity and temperature days.

Need to make a note of the conditions when it won't get below 50.
Ambient air temp
RH
Actual outlet temp.
Are you idling or stuck in traffic when this happens? Low air flow over the condenser will give warmer outlet temps.
Did you change temperatures? Check blend door or actuator
Pop the hood. Is the low side of the system freezing? Condensation and cold is normal, not freezing.
50 cant be normal, when its not acting up it gets down to 42, like yesterday and the truck thermometer said 108. Cab was nice and cool.

Just went to UPS and it would not go below 50, wont cool interior at that its only 95 right now.

Happens under both scenarios: Traffic and or on road.

Nope got in started truck and its on, t stat set at 60.

Not frozen.

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Last edited by digitalplumber; 07-26-2013 at 02:44 PM.
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