A/C Problems.......Stumped

Its not as bad as you think if you had alot of powered compressor parts in system you would have locked up the new comp. in less than a day, you have a temp sen. inside the heater a/c box under dash that must work to turn off a/c comp. when lines start to frez. up, replace it then be sure comp. is turning off then back on in a short time to melt ice inside evp. box, You can buy a air powered vac. pump at auto parts store an run it off your tire air up line you hook to your trailer line.

 

If it is in the liquid line (from the condenser to the evaporator) and already has a sight glass get the same one. If it doesn't have a sight glass, get one that does.

If the thing on the firewall is an aluminum tank in the low pressure line (between the evaporator and compressor), it is called an accumulator. A sight glass won't help you there.

You can get pretty close on a CCOT system by charging it while your hand is on the outlet pipe of the evaporator. The instant the line gets suddenly very cold, you have enough.

 

Harbor Freight sells gauge sets and vacumn pumps. I'd recommend getting both if you plan to do much of your own AC work. For less than three hundred bucks, you'll have everything you need to service your own AC.

 

"Every can does the same, needle moves up when it's going in and starts going down when the can is getting lower and lower."

If you're using one of the can adapters that has a gauge, you have to let go of the trigger in order for it to read the pressure.

 

IF you take off the cover of a/c box under pass. side of dash you can look for dirt and trash in your a/c heater box an clean them, 2 wires will lead you to temp. control switch inside or on top of box with the probe that tell a/c comp. when to turn off to melt off ice, not sure the one your year truck has