ok so ive run the eclassbenz.org trouble shooting guide several times, keept saying freon was just low tried adding some when i did after just a little bit the a/c comp. kept clicking off, the front part wasnt spinning w/ belt. so i let alittle bit out and comp. was spinning again , found out a/c evap. temp. sensor was bad, replaced it a/c was working good again put guage on low side while a/c was working it read med-hi but not in the red zone. now today i go for a drive and a/c not working again, comp. is spinning but now when guage is on low side its way in the red. what happened i have not added any freon or done anything since it was working yesterday. i run the eclassbenz trouble guide and it says freon might be low , but i dont hear any hissing and w/ guage in red about 100psi i dont want to add more freon. i thought maybe that i had to much air pressure and not enough freon but local mech. said that air can only get in if system has been opened and it hasnt any ideas gladly appreciated . thanx
Sounds like you have a leak. In addition seems that you did not replace the dryer as should be done with a leak. My suggestion is to have a good A/C shop troubleshoot and repair
I really wish auto parts houses would refrain from selling these cheap recharging kits. The makers of these things don't car if your AC works after you buy their product. They know that they'll make money even if they get no repeat customers. But some people will go back, simply because they do not realize just how inferior these products are.
Did you purge the hose of air before you added refrigerant to the system? If not, you just shot air in there.
If the compressor is not pumping, the pressures tell you no useful information. If the compressor is turning but not pumping, I would suspect that the valves gave up.
how does one purge the hose of air also by dryer do you mean what the a/c shops use after the vacuum and recharge the system if i have a leak how come the pressure has gone up in the pass day like i said it was working after i put new evap.temp. sensor and i added only a small amount of freonand the pressure was like 30-40 then today after nothing but sitting its a100+ ?
You purge the equipment by running just a bit of 134a through it to displace the air. This is a critical step, and allowed by EPA rules.
Air in your system is an enemy and will cause extremely high pressures without good cooling. Air also contains moisture, which can cause troubles of its own. Water can turn your oil to an acidic sludge.
Too much refrigerant can also cause problems, which may also have been the case.
Is this 100psi reading with the compressor off? If so, it means nothing.
The dryer is a part of the system. In our cars, it is incorporated into the receiver, which is located just below and behind the left headlamp. It contains a desiccant which absorbs the last bit of moisture from the system after a full evacuation. You try to get all of the water out with a vacuum, but the dryer is there for added insurance to prevent any water contamination of the oil.
i didnt purge so there must be air in there what should i do evacuate the whole system myself and throw a couple of cans in while purging the line , will evacuating mess up my pag oil, do i take it to a jiffy lube or something have them do a full vac. re charge, but if i have a leak paying for a recharge is gonna piss me off cause im broke. but a 90+ degrees i gotta do something quick
You can't purge the system with refrigerant. That's just for the lines of the test/refill equipment.
To evacuate the system, you need a vacuum pump. Don't bother with a venturi pump, as these aren't good enough. I have a 1/3hp 5cfm dual-stage Mastercool pump that works very well and costs just over $200.
But before you evacuate the system, the existing refrigerant must be reclaimed. As a DIYer, you're allowed to use non-certified reclaiming equipment as long as it is capable of putting the system under 4" of vacuum. An evacuated refrigerant can immersed in dry ice will do that.
so basically im gonna have to bite the bullet and pay to have it checked and vacuumed and recharged, its gonna be a hot couple of weeks before i can afford to do this! thanx for your help again matt, ps i didnt mean purge the a/c sys. i meant purge the line from the can while recharging myself.
so i just ran to the store and a/c works again blows nice and cold worked after a couple seconds, the only thing different is the temp outside has drop because its evening now. what would cause this.
Linear Mode
