Question about 2004 Ford F150

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My air conditioning will not run in my 2004 ford f150. The compressor was not turning on when the max a/c was on. I bought a tester and the pressure was low at 25 psi so i added some coolant while the a/c was on max. At about 40 the compressor kicked on but then turned off again. Now when i turn on the max a/c the compressor turns on and off repeatedly. still no cold air

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The reason your compressor is cycling on and off is due to low freon. If you have low freon to start with, then you have a leak somewhere in the system. This could be a leak from a hose. O-rings at a connection, etc. These systems are complex, more so than the R-12 systems we are used to back in the day. The best way to approach this problem is to have it leak tested 1st, and you must use a gauge assembly that is rated for r134a...not r-12, they are not compatible and using the incorrect manifold gauge assembly to trouble shoot can cause damage to the system. Also, leak test kit MUST be for r134a, an r12 will not work either.

Posted on Jun 04, 2010

  • 2 more comments 
  • rwklroloff Jun 05, 2010

    I put in coolant till it hit 75 psi and still no change. the compressor kept cycling on and off. i drained the freon back to about 45 psi. It is holding that pressure

  • rwklroloff Jun 05, 2010

    When the compressor kicked on the pressure gauge would drop then go back up to 45 when it kicked off

  • rwklroloff Jun 05, 2010

    can u walk me through filling it and or checking for leaks? Before I accept this i want to make sure of that

  • rwklroloff Jun 05, 2010

    i don't quite understand how this works. Am i supposed to accept this solution then you tell me how to fix it? I don"t care if it is slowly leaking. I need air conditioning now I can get the leak fixed(if there is one) later. I recently rebuilt the left side of this motor in place(left head and timing system). There is a chance that my 72 year old father emptied the system thinking that we had to to rebuild the engine.

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Posted on Jan 02, 2017

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1 Answer

1990 F150 the A/C blows warm and i will have it set to max and when driving down the road it often switches to floor vent, what might be the problem?


Hi Johna Brooke,
It sounds like you have a couple of concerns.. First,the air warm from the vents indicates a system perfromance problem. You want to look at the air conditioning compressor clutch to see if it turns on when the system is turned to max. a/c. If it does not,the system is probably low on refrigerant. Now as far as the vent concern,you are probably loosing the maniflod vacuum source to the dash. I can send you information on how to check this if you like but I will need to know engine size and if you have a manual or automatic a/c system.Thanks, I will look for your response,Chuck

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No air conditioning


possible low pressure switch located on the accumulator

Jul 20, 2010 | 1990 Ford F250

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I just put in freon and now it wont give out cool air


Is the compressor engaging and did it engage before adding freon?
What is the pressure on the gauge for the low side? 25psi to 45 psi is normal when the engine is running and the compressor is turning.

If the compressor is not turning the pressure should read 75psi to 100psi, before the compressor starts turning.

Also, the radiator fan should go on when you engage the air conditioning by turning it up to max.

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My 2004 F150 supercrew 4x4 AC blowing warm air


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.

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1 Answer

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The first thing to check is the pressures in the ac system. If it is too low on R134 the low pressure switch will prevent the compressor from turning on.

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Is the compressor cycling? If it is the refrigerant charge is most likely low. You will have to hook up a set of gauges and see what your pressure readings are with the A/C on and add the appropriate amount of R134a.

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2 Answers

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Check if compressor clutch is engaged when A/C is selected,
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(To check low gas switch, just ( briefly!) bypass it - if compress clutch engages you have low gas press.)

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1 Answer

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