In my 95 the air conditioning will blow cold - really cold, then will turn hot almost instantly, then after a bit it will blow cold again, sometimes it will work perfectly for weeks, then all of a sudden it will begin blowing hot then cold again, like it has its own mind. Rear air works fine at all times.
I just started having the same issue....any luck finding the problem?
It also seems that on the highway I will have this problem but when I get into stop and go traffic, it stays HOT all the time until I get back to highway speeds then it gets cold again but then back tot he Hot/cold cycle. Anyone have any insight?
Orifice tube is plugged. Which means there's contaminate in a closed system. Chances are your compressor started chewing itself up and parts of bearings is what is plugging the orifice tube.
Mine seemed to start doing also. Just recharged system after I just replaced drier/accumulator, & some leaking o-rings in rear ac system connectors. (by the way, auto zone has a loaner vacuum pump!) I have a manual shut off valve, on heater hose, so I decided to try the turn off, & so far all seems fine. Maybe my blend door is acting up?
Yes, likely the orifice tube is having issues. It's got a little screen on it so only really small stuff will make it past. If you have the variable tube then the variable part is getting stuck.
Thanks for the info guys! Anyone know where I can physically find this "orifice tube" on the van? Part number? Im guessing I will have to vacuum or drain the system then recharge it.
I never had mine out, but I see a section of line, over the evap box, under hood. I looked at youtube videos to figure out. The section where orifice inserts, is not very big, kind of looks like a 1/2" od line shrinking down to a 3/8" sized line, then into evaporator. Sorry I don't know my metric sizes by eye.
The orifice tube is located on the inlet line to the evaporator. If you pull that connection loose it should be right there, you grab it with some needle nose and yank it out.
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