Question about 2004 Ford F150

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My 2004 F150 supercrew 4x4 AC blowing warm air

My 2004 F150 supercrew 4x4 blows warm air. The carge is at 45# on the suction line and its cool but not cold and sweating. the high side line is very hot. I washed the condensor coil in front of the radiator twice and blew out with an air hose. I have it on MAX AC. Has there been any other reports of this issue. also is there a way to access the evap coil or is there a filter on the evap coil?

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  • Ford Master
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I can give you a few tips on this but you need to check the specifics for your low and high A/C pressure switches. The 45 sounds slightly high.

What you want is to have your A/C compressor running steady for maximum cooling. This means the charge pressure is moderate and it keeps the pressure cut-off switches from deactivating the compressor clutch the longest. The pressure is high enough to keep the low pressure switch from activating and low enough to keep the high pressure switch from activating.

These switches can usually be changed without losing Freon. The spring resistance can weaken, changing when the switches work.

There is a difference in the Freon oil charge for different makers. This can affect performance and durability. The filters you mention are often contaminated when the system is open through complete Freon loss.

Another way of looking at this is a 45 psi is suppose to be Freon. All is good when it is pure, but if contaminated with ordinary atmospheric air, it can not work as good or even at all.

There are some other products you can use to clean the coils and such. A foaming product is sold at stores like Lowes or Home Depot. Theory is it works like shaving cream, expanding in the fins and pulling dirt out. You then flush with water. Check label warnings for use on different metals.

Find out when the cut-out switches are suppose to activate and what your recommended switch thresholds are. Hope this helps.

Posted on Aug 12, 2017

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Check for vacuum leak going to air inlet door. Should be a white vacuum hose.

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http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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