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1990 f150 ac will not get cold. I have replaced the dryer. Orifice valve, pulled a deep vaccum refilled with 38 ounces of fresh freon. Still not cooling what am I missing?

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Do you have a leak?38 ounces could be gone.How many cans did you put? did you put stop leak?

Posted on May 10, 2017

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Posted on Jan 02, 2017

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I have a po532/po533 replaced the whole system less evap. Core performed evac it held 29in i recharge the system to one pound fourteen oz and system is cold excellent pressure high and low shut off a half...


There is a lot more to it than that. This is why the service bill is so high. Did you replace the Orifice tube or expansion valve? Did you replace the receiver/dryer? Did you flush the whole system out with solvent? Did you put the oil back in?

The proper steps are:

1. Remove any Freon with a recovery station.
2. Isolate and remove the compressor.
3. Remove and discard the receiver/dryer.
4. Remove and discard the orifice tube/expansion valve.
5. Flush the system with solvent and catch the discharge to check for rust and debris. If any are found, replace the whole system.
6. Replace the orifice tube / expansion valve with new one.
7. Replace the receiver/drier with new one.
8. Replace the oil in the system with fresh oil in the right amount.
9. Connect all compressor fittings on the compressor.
10. vacuum the unit down for at least 4 hours.
11. Recharge the system. Check performance and leaks.

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A/c valve


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