Question about 1990 Ford F250

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1990 f250 air condition problem

This truck is the old r12 system, drained the system complety of old freon.
tryed to refill the system with 134a and it will only let me put about 12 oz or 1 small can of freon, before the pressure is to high and wont take any more,this refill was done while the truck is running and a/c is on.I have performed this conversion several times before on other r12 systems with no problems, can you tell me if there is a part of the system that controls the pressure? and why its not alowing me to fill the system to full and blowing cold air?pump does engage when it take the first can.

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  • brian c
    brian c May 11, 2010

    I'm not sure what type this truck uses, but it sounds like the orifice tube is clogged.

  • Anonymous Mar 12, 2014

    03 F350 4d diesel freon full power to pressure switch on dryer no clutch inguage system 1 year old

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  • 28 Answers

Here is my opinion:
If you just change the type of refrigerant, there are many other things to consider.
The most important, i guess, is the fact that you have the change oil and accumulator receiver, along with a complete system cleaning in order to remove ALL of the type of oiul used for R12.
This is because, if you dont do this, the compressor will fail, due to the oil for R12 and oil type for a R134a system.
Try it this way, it should work good.
Also check your suction line valve for a clog or your gauge manifold blue line rubber gasket, and do not apply too much force when you hook the hose to the valve, as this may reduce the quantity of refrigerant going in the system.
Hope this help....





Good luck..........

Posted on Aug 14, 2008

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