a/c charge ok-still hot??

[dustindiesel]

hey all...got me some hot a/c...feels the same whether its on vent or a/c position..which is horrible in florida.

went to the parts store and picked up a can of 134a with a low side gauge on it and hooked it up w a/c running and gauge read 40psi...seems about right but a/c isnt even trying to be cold...compressor runs though..not sure what high side press is but im thinkin i may have a toasted compressor...
none of the a/c line are cool to the touch either....whatch think???

should i add more 134a...???

thanks

[matts7.3]

does your prressure reading change at all when you switch the a.c on and off?

[dustindiesel]

yea it jumps up about 20psi or so when compressor isnt on....

[matts7.3]

If its jumping , then your compressor still should be o.k, You can have someone else flip the switch while you look, but also check to make sure that the clutch is engaging on the compressor when you turn it on. If that all is working try and get some gauges on the high side. Is the high side extremely hot to touch. If it is and the low isnt getting cold or sweating then you possibly could have a blockage on the high side. Check it out and let me know what pressure your getting if you can.

[matts7.3]

Since you live in FLA and its gets so hot, you may want to at some point put a bypass on you heater hoses going into to coil inside the cab. It helps, since the fluid will not circulate through when you shut the valves to bypass it. Also check you Selection switch. I had to redo my wiring on it because my cupholder grabbed the wires in the dash and messed em up.

[dustindiesel]

Originally Posted by matts7.3

If its jumping , then your compressor still should be o.k, You can have someone else flip the switch while you look, but also check to make sure that the clutch is engaging on the compressor when you turn it on. If that all is working try and get some gauges on the high side. Is the high side extremely hot to touch. If it is and the low isnt getting cold or sweating then you possibly could have a blockage on the high side. Check it out and let me know what pressure your getting if you can.

the clutch is engauged when switch is on a/c mode..high side is extremely hot to touch and the low pressure side is a little hot as well-not cold and sweaty like its supposed to be..ill try to get some high pressure readings
thanks for the quick help

[matts7.3]

Also there are two sensors, one on the high side next to the compressor and one on the low side by the dryer (cylinder looking thing) with the air on unplug each of those one at a time and see if the cultch disengages, if it does then it seems that everything on the surface is working. Try and get a high side reading when you can. Good Luck

[jfines@cox.net]

If every thing is runnign fine. Then I would check the High Side if you can get a set of gauges.
I just replaced my system, due to a failing compressor.

[jfines@cox.net]

Opps, wrong button.

If the high side is high, and the low side is normal. then could be a plugged liquid line.

[dustindiesel]

thanks...will ck it tomorrow and post readings when i can