dash air charge

Moved from Forum Technical Support

Paul, if no one gives you a answer I'll follow up in a couple of days my coach goes in to get recharged this Wed.

Do you have a IR temp gun?

PSI is VERY dependent on ambient temperature.

Anyone who works on automotive dash A/C's can check and charge your system.

J-Rooster
thanks and I'll be watching for that report.
I'm a career do-it-yourself.
Paul

The pressures can vary quite a lot depending on temperature. Generally speaking the low side will be 35-45 psi and high side 150-200. That said the best way is to evacuate the system and weigh in the correct amount usally stated on the sticker under the hood.

Most times there is a sight glass in the liquid line. It should be clear. Clear would mean it's fully charged and all liquid is passing by or that is completely empty. If you see bubbles, it may need more Freon especially if it is nearly all bubbles. If only a few bubbles, the system probably has enough.

Do you have a vac to empty the system before charge? It's really important.

Go to a department store, buy a can of ref. 134 costs about $40. Follow the directions on the can closely, the ambient temp is adjustable on the can and also gives the high and low press. Add to the low side of the compressor, it will have an L on the cap that you will need to remove and will be the larger of the 2 lines. It will not fit on the wrong line, it just snaps on. Takes about 5 mins to recharge the system, on need to evac the system. Even I did it no problems., cold now.

Lost our dash air when coming out of Texas this spring, had it checked out in Elkhart, IN, on our arrival. Turns out it was a 30' plus AC line, running from the engine forward, that had "rubbed through" on the frame, after 8 years of service. The AC tech put in a 6" piece of line, 2 couplings & charged the system. Net result for us was cold, cold air and $168 for him.