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look at the connection fitting as this was the change over period from R12 to R134 the latter of which will work of sorts but as well on the earlier system but R12 is now prohibited from sale as too polutant
You have either a bad pressure switch or your system is to low on freon. pressure switch is located near evaporator close to fire wall to check use jumper wire across the 2 terminals if compressor turns on add freon the chances are that the switch is ok. make sure to add the freon on the low side of system and use a gauge on the fill hose (the better fill kits have the gauge on the hose). If you get cold air out the vents and then after a bit it doesn't seem cold you have a leak in the system. Make sure to use the correct type of freon should have a sticker under the hood. I think it should be R-134A but make sure the sticker will tell you the correct type.
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Hope this sheds so light on your problem
There is more to it than this,the ac system will have to be reset,by removing the negative battery cable for 25 seconds and putting it back on,but if the cables on this van have not been removed before,check with the dealer to make sure the computer will not loose it`s memory before you do this,unless you know the computer will be fine,after resetting the ac system,the freon level needs to be checked,this is most likely the problem,low,or out of freon.Please rate if this is helpful,at all,thank you.
On yours, you can use atf but power "steering fluid" works just as well.. steering fluid is used as a specific requirement on later vehicles and if you use it in the 85, you can use the leftover to top off anything you have that is newer. (can't do that with atf)
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