jeeptec1 Posted June 17, 2021 Share Posted June 17, 2021 Does anyone who has either factory or aftermarket add on have the Freon label still under the hood. Kinda wondering what the factory fill is. Mine is converted from R12 to R134. I’ve put in about 1.25 lbs. seems to do ok. Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
ghetdjc320 Posted June 17, 2021 Share Posted June 17, 2021 This is a question for @Minuit. He just posted the spec somewhere on here within the last week or so Link to comment Share on other sites More sharing options...
Minuit Posted June 17, 2021 Share Posted June 17, 2021 What year and engine? Link to comment Share on other sites More sharing options...
jeeptec1 Posted June 20, 2021 Author Share Posted June 20, 2021 What year and engine?1988 4.0Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Minuit Posted June 21, 2021 Share Posted June 21, 2021 On 6/19/2021 at 9:42 PM, jeeptec1 said: 1988 4.0 Sent from my iPhone using Tapatalk The sources I read say the factory fill was 36 oz of R-12, so you're well below a full converted charge. If I were doing the work, I'd start at 28 ounces and go from there. You might try adding about a half a can and seeing what that gets you. Just watch the pressures. My chart for factory charge has been reliable every time I've looked, but I can't say for 100% sure because I don't have the '88 FSM. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted June 21, 2021 Share Posted June 21, 2021 15 minutes ago, Minuit said: The sources I read say the factory fill was 36 oz of R-12, so you're well below a full converted charge. If I were doing the work, I'd start at 28 ounces and go from there. You might try adding about a half a can and seeing what that gets you. Just watch the pressures. My chart for factory charge has been reliable every time I've looked, but I can't say for 100% sure because I don't have the '88 FSM. Sorry to hijack but do you have the specs for the 91 also? Not sure if my capacity changed much with my plate and fin evaporator and the newer condenser. Going to replace my drier, flush, vacuum and refill when I get back Link to comment Share on other sites More sharing options...
Minuit Posted June 21, 2021 Share Posted June 21, 2021 24 minutes ago, ghetdjc320 said: Sorry to hijack but do you have the specs for the 91 also? Not sure if my capacity changed much with my plate and fin evaporator and the newer condenser. Going to replace my drier, flush, vacuum and refill when I get back The spec for '91 is 38 oz of R-12. The evaporator and condenser will almost certainly lower the capacity by some margin. I'd be guessing if I gave a number, but you've made significant enough changes that the factory specs really aren't relevant anymore. 96 XJs used exactly the same evaporator and condenser as 91s and used 2 lbs of R-134a. 97+ XJs with parallel flow everything used 20 oz of R-134a. Just to give you an idea. But 97+ systems are orifice tube systems instead of expansion valve systems, so it's really not apples to apples. Link to comment Share on other sites More sharing options...
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