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1991 F 150

westtexus on Thu July 03, 2008 1:04 PM User is offline

Year: 1991
Make:
Engine Size: 300
Country of Origin: United States

I have a 1991 F 150, 300 six cyl. If I recharge with R12, which was original, as opposed to R134A, what should pressures read? Are they to be the same regardless of refrigerant type?

Chick on Thu July 03, 2008 1:29 PM User is offlineView users profile

A lot depends on how good your fan clutch is, ambient temp etc..Recharge withe factory amount and then use the pressures to check, also be sure to pull a good vacuum and charge into the vacuum, if your not charging from empty then post your complaints and pressures..Hope this helps..
Pressures are ball park anyway since they depend on so many variables...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

chris142 on Sat July 05, 2008 12:52 PM User is offline

I just did a major on one last friday. Specs is 3.25 lbs of R12. I put R-134A in it and it was working pretty good. Put in 2.76 lbs R134a and an orange tube.

westtexus on Sat July 05, 2008 1:00 PM User is offline

i did a retro, vacuum for 45 min, put in 28 oz r134a, vent temp is 60, high pressure 225 at 82 degrees. going by the 2.2 of outside temp, should i add more r134a, the high will get higher, wont that be too high?

westtexus on Sat July 05, 2008 4:30 PM User is offline

42 oz R134A=40 degrees, all is well

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