# AC blows warm. fan + compressor don't seem to engage.

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The system could be low on refrigerant. The A/C pressure switch will not let the compressor run if the system pressure is below 28psi or above 455psi to protect the compressor from damage. At low pressures not enough oil (mixed in with the refrigerant) will circulate, and at high pressures, the compressor seals will likely blow. You can get a set of A/C manifold gauges for R-134a and check the system pressures yourself or get a shop to check it and possibly add some R-134a. If the system pressure checks good, then the A/C pressure switch, the compressor clutch, or some relays will need to be checked.

Posted on Feb 05, 2011

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For example the gauge would read some thing like this.
75 F = 40psi
80 F = 45psi
85 F = 50psi
90 F = 55psi

Posted on Jun 12, 2013

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Posted on Jan 02, 2017

SOURCE: ac compressor won't engage

the ac compressor has a safety switch built in it to keep it from coming on if the liquid level of freon is low this keeps the compressor from overheating and going out all together. try hooking up a can of R134a and turn the can upside down so that the liquid flows in and the compressor should kick in with almost one full can.

Posted on May 11, 2009

SOURCE: ac blow warm air

need to have a set of gauges on it and read the low side and high side to see if pump is weak that year compressor i think is on the bottom passenger side ,it is not a good desigh pump may be weak

Posted on Jun 30, 2009

you either have a power loss problem but more likley your low on refrigerant. if its low, there is numerous pressure sensors that will not allow it to engauge to protect the compressor. you got to put a gauge on it. standing system at 80"F should have about 80-90 lbs. standing pressure.

Posted on Aug 25, 2009

SOURCE: ac blows warm

The flap that controls the air flow from inside circulating to AC has broken off. This is a manufacturer defect, the sunlight comes in through the vent and dry rots the flap and then it falls into the fan which can either not blow ac or blows warm engine air. Go under the truck, remove the 3 bolts, put your hand up there and yank the flap out. Once the flap is gobe the fan can spin.

Posted on Jul 19, 2010

OOPS ! Now, it sounds like the A/C relay is constantly on. In the power distribution box by the battery, try swapping another relay for the A/C relay (which turns the compressor on), and see if it now stops. If so, buy a new relay. Good luck.

Posted on Jul 12, 2012

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Your system is low on R134....the clicking is the compressor engaging and disengaging. You will get cool air while compressor is on, then warm when its off. They will act this way when R134 is low. Now either a leak in the system, or the system just needs a boost. Another thing to check is the condensor fan under the hood.When you turn the AC on,the condensor fan needs to be running, if its not then its a bad fan motor,relay, or fan sensor. I don;t know what your abilities are, but maybe armed with this info you can work on it yourself, or at least not get taken advantage of at the mechanics. Good luck !!

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I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

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would need to look myself but is the electric fan coming on when the AC is turned on ?? check this first as the gas pressure will rise if its not being cooled causing the Ac to cut out

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was it regassed when you changed the compressor? a/c units can be quite difficult, they have certain pressures inside and the valves will not engage the compressor if its not gassed right. on the pipe running from the condensor to the compressor you should see an outlet/inlet valve, you can use your key or a small screwdriver to depress a valve in it to see if its got pressure, just give it a quick push to see if pressure comes out so you dont reverse the valve inside the system and pop the rubber seal. good way to indicate if theres gas and pressure. its like your tyre if your releasing air out of it if this helps.

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