fazmig

Yes sir, sure did for about 3 hours. Update: Cruising down the hwy at 75 miles an hour and the 4th speed on the fan, it only blows to 60 degrees. As soon as i drop it to the lowest speed it drops down to about 48ish 50 degrees. According to the weather channel its 93 degrees right now in southwest tx!

Busboy

I noticed the OP didn't mention the evacuation part but I figured because of the work that was done the person doing it knew enough about AC to evacuate. As for colder temp with lower fan speed, the air moving through the evaporator is what removes the coolness, the more air you put through the more cooling it removes until there's none left so starts to blow warmer. You say you replaced the expansion valve, was it an adjustable one and is the capillary tube bulb tight against the suction pipe and wrapped. One other thought, the blend door is it all the way over to full cold, by operating the temp lever you should be able to hear the door flapping against the plenum wall, could you perhaps have slightly moved the cable. Be careful with the cables over time the plastic ends get brittle and break easily.

Greed 93

Sounds like the heater valve is not closings all the way..

fazmig

I went ahead and bypassed it and tried it out with the same results. Man this is aggravating lol

maybe368

As I asked above, is your air box full of crud? Look at post 39 of this thread ...Mark

fazmig

Its not, about 4 months ago the heater core got replaced and it was cleaned out at that time.

maybe368

Is it R12 or 134A? It is really easy to overfill 134A and this adversely affects performance. If it is R12, is the sight glass clear?...Mark

fazmig

Its r12, and do i check for the sight glass to be clear when truck is on and ac workig? Thanks for all the responses.

maybe368

Yes with the ac on high. Did you charge it with gauges? High and low side? If so, what were the numbers? How much oil did you put in?...Mark

brcron007

I had a similar problem on my 92 W250 and it turned out to be a bad crank sensor. Which is tied into the ac system somehow ? Truck ran fine. Changed the sensor and the AC blows at 28 degrees (R12). Just passing along my experience with the same problem

fazmig

Compressor was topped off with oil before installing with ester oil, as for freon, it was filled with 3 and a half cans of r12, which is about 40 oz of which 41 are recommened acording to spec. After the compressor install, an additional 2 oz of ester oil were installed into the system

fazmig

Thank you for your response, i also checked the sight glass in it is clear, no foaming or anything. Do u happen to know where that crank sensor goes??

maybe368

What do you mean topped off? The entire system only needs 8 ounces, too much would give you your symptoms...Mark

fazmig

According to the paper work that the compressor came with, "murray brand from oreilly's" it wasnt full of oil.

maybe368

We have found the problem, It is not supposed to be full. You are supposed to put 8 ozs in the compressor, no more. Some people divide the 8 ozs between the filter dryer and compressor, but the oil will disperse naturally. You need to purge the system again, put 8 ozs of oil in the compressor, evacuate and recharge...Mark