91 F150 AC question
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91 F150 AC question
My baby is a straight 6 - 4.9L F150 Custom 4x4. She wont blow cold air out. Sounds like the compressor kicks on when i put it on MAX AC, but it never gets cold. Should I try some of that UV dye to look for leaks and if I dont find one is it safe to use one of those self converter kits from NAPA and charge up?
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have you tried to add freon? When you mentioned conversion I presume you still have R-12. If you want to convert to 134 I would suggest reading up on the process. there are forums dedicated to ac http://www.autoacforum.com/
Hope this helps
Hope this helps
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Joined: Apr 2006
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Hvac Basics...
...DO NOT MIX R-12 WITH R-134a!!!
The charge-port fittings on the high-side & low-side are different for each of these refrigerants and mixing these 2 creates a volitale condition!!!
The gauges are refrigerant-specific...there is a REASON for this!
If your truck is a '91 Ford it IS using R134a. Look for a sticker on the accumulater, compessor, or call a parts store.
If the compressor comes on you some have refrigerant in the system. This means neither the high or low pressure cutout switches have been activated. These 2 prevent damage to the system...too much pressure is dangerous and too little means the components are not receiving any oil circulated with the refrigerant!!!
I cannot find ANY DIY kits at ANY parts store that will attach to my '91, I looked at them all, they all $UCK!
Usually for around $100 an EPA certified shop can hook up your system, pull a vaccum on it, do a leak test, and have you on the road in less than 1 hour!!!
For that ammount of cash it IS worth it.
The charge-port fittings on the high-side & low-side are different for each of these refrigerants and mixing these 2 creates a volitale condition!!!
The gauges are refrigerant-specific...there is a REASON for this!
If your truck is a '91 Ford it IS using R134a. Look for a sticker on the accumulater, compessor, or call a parts store.
If the compressor comes on you some have refrigerant in the system. This means neither the high or low pressure cutout switches have been activated. These 2 prevent damage to the system...too much pressure is dangerous and too little means the components are not receiving any oil circulated with the refrigerant!!!
I cannot find ANY DIY kits at ANY parts store that will attach to my '91, I looked at them all, they all $UCK!
Usually for around $100 an EPA certified shop can hook up your system, pull a vaccum on it, do a leak test, and have you on the road in less than 1 hour!!!
For that ammount of cash it IS worth it.
Cargo Master
Joined: Jun 2002
Posts: 2,033
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From: Aurora,Colorado
[QUOTE=Old Ford Guy]...DO NOT MIX R-12 WITH R-134a!!!
If the AC hasnt been converted--the AC in a 1991 Ford truck was R12. Ford didnt convert to R134a until--about 1994.
If the AC hasnt been converted--the AC in a 1991 Ford truck was R12. Ford didnt convert to R134a until--about 1994.
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New User
Joined: Apr 2006
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Opps...
...your right, my '91 is R12. I was thinking it was my other truck. The rest of the info on refrigerants is correct though.
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