1999 Express 3500 Air conditioning

My air conditioner needed charging. My compressor was not running when on. I put 10 oz. can 134a in, compressor kicked on. Then it started turning on and off and the low pressure gauge goes way high when compressor kicks on then back down again when it turns off. The air works a little bit

My air conditioner needed charging. My compressor was not running when on. I put 10 oz. can 134a in, compressor kicked on. Then it started turning on and off and the low pressure gauge goes way high when compressor kicks on then back down again when it turns off. The air works a little bit

If it is that low it needs a complete evucation and pump down and recharge with the correct amount of R-134a and correct type an s amount of oil.

You can not test or recharge ac right with the one side one gauge kits
Or wal mart type AC killer kits

For recharging you need a gauge set with low and high side gauges.

Post back reading on low and high side at adle and at 2K rpm with compresser running.

http://www.ackits.com/merchant.mvc?Screen=CTGY&Store_Code=01&Category_Code=RefrigerantGaugeSets

http://www.ackits.com/merchant.mvc?Screen=CTGY&Store_Code=01&Category_Code=RefrigerantGaugeSets

http://www.autoacforum.com/



Wal Mart DEATH KITS

You cannot properly and safely recharge an air condition system with them.

The one side stop and go gauge does not tell you what your system is doing or is over charged or undercharged.
A overcharged or malfunction air condition system can reach over 500 lbs of pressure.
Enough to blow up that can or system and freeze you at first and the burn you or blind you and if any propane /butane in there blow and light you up.

The stop leak crap and who knows what kind of oil in the kits there will stop your system for sure.
Just like pouring super glue in it.
And some kits even contain freon with a butane mixer.
Good for a big blast.

If you are going to do it do it right and safe.
Here is what you need to start with.
http://www.ackits.com/merchant.mvc?Screen=CTGY&Store_Code=01&Category_Code=RefrigerantGaugeSets

In the older days you could just throw in a can and go.
But over the years just adding freon is getting harder to do.
Newer systems have to have the correct amount of freon down to the ounces.
Most will need pumped down and vacuumed down and the right and amount of oil and a set amount freon charge installed to get the air to cool right and the system to last.
If an air condition is low there is usually a leak that needs fixed and also a lose of lubricating oil from system.
Also air and moisture enters a low system
If you are going to try to do it get the proper type air condition gauge set with the low and high side gauges.
Hook up the gauges and get a reading with compressor running at idle and at 2000 rpm on the high and low side.
Post back pressure reading and we can help you.
MT

thank you for the reply I think I'll take it to the shop I'm tired of messing with it.

thank you for the reply I think I'll take it to the shop I'm tired of messing with it.

You are welcome.
If you would rather pay them to do it that DIY it good choice.
Just make sure you find a good one.
Good luck

Tips on finding a good one.

Check around Ask around
Word of mouth.
Family friends coworkers neighbors business people and delivery people.
Mailmen and parcel delivery people get around and notice a lot of stuff.
Even a good parts house knows what shops are good and not good.
Chamber of commerce and better business bureau and city hall.
If you find a good referral to a repair shop go look them over and talk to them.
Look for a clean looking busy place with nice people running it.
Ask a few questions and ask about their qualifications and training.
Not all places have trained tech/mechanics.
If they do not find a place that does.
Even all dealers do not have all trained techs/mechanics.