89 F150..5.0Litre.Did a 134a retrofit and can't get cold air.Here's where I'm at.
New Compressor
New Reciever/Drier
New Blue Orifice tube
Flushed entire system
Passed leak test
I have charged system anywhere from 75 to 85% of R12 capacity (52oz.)
Low side running at 55psi
High side running at 250psi
ambient air 85 degrees
65 degrees at vent with max A/C on
Any Ideas?????

 

Sounds like and over charge.
Low side should be about 42 PSI.

 

Sounds like and over charge.
Low side should be about 42 PSI.

 

Yeah, 55 is too high on the low side but I would expect more than 250 on the high side. I think your orifice tube is too big, I used a red on on mine. Isn't it red-white-blue from smallest to largest?

 

If in fact it is red/white/blue that may be the problem.Can anyone verify the red/white/blue thing?As mentioned I installed the blue.
Thanks

 

Ford Colors Orifice Tube sizes:
Blue = .067
Red = .062
Orange = .057
Green = .052
Brown = .047

The only white one I know of was used in the GM line and it was .072.

Ford F-series:
81-86 Blue (R-12)
87-90 Red (R12)
91-93 Blue (R-12)
94-96 Red (R134a)
97-98 Blue (R134a)

 

Thanks Subford.....so which would you reccomend for the retrofit?

 

Sounds like you need the red one.

 

Sounds like it has to much in to me too. I just did my '89 retro this last week and went blue orifice and I am right at 44 degrees idling and 38 degrees driving. Feels GREAT. My system only took 3lbs. bone dry.

Aaron