2006-07-02 17:24:34 · 5 answers · asked by big_daddy99_38 3 in Cars & Transportation ➔ Maintenance & Repairs
ok 1994 chevy 1500 5.7 r134 a and i think its the switch cause i tapped it with a hammer and it started to work
2006-07-02 20:26:38 · update #1
no,,on 90% of the vehicles today you don't,,it has a back up valve behind it that will hold back the pressure,,if you start to loosen the switch,,and you hear a leak,,tighten it back up,,this mean,s the main valve is either stuck open or has failed in some way,,then you might have to take it and have it done,,otherwise,,thing,s should go fairly easy for you on this job,,hope this help,s some.
2006-07-02 17:34:32 · answer #1 · answered by dodge man 7 · 3⤊ 0⤋
Why do you think you need a cycling switch? I'm not being rude just asking. Many people think they need a switch because their clutch engages and disengages very rapidly with the a/c or heater on. This most likely means your system is low on refrigerant. Not saying the switch is not bad but if you are making the call yourself you might be disappointed when you change it yourself and it is doing the same thing. Since you didn't give details about the problem you are having I just thought I would throw that out there just in case this is what you are experiencing. There are many things that can cause rapid cycling, if you haven't had it checked at a reputable shop you might think about it before spending hard earned money. If your car is newer like post 70's you should be able to replace the switch without discharging the system although some foreign cars in in the later years don't use schrader valves at their switches so be careful.
2006-07-02 20:13:22 · answer #2 · answered by shel_bug66 4 · 0⤊ 0⤋
You should always state the make, model and yr of the car you have questions about.
The switch should be on a schrader valve; as such no you should not have to drain the system. Verify this with the new valve, which should have a means of depressing the schrader when it is screwed into place. You may best verify with a service manual which is the first thing you need to buy of you intend to do it yourself.
Freon is a generic name for the R12 refrigerant that was outlawed by the US in the early 1990's. Since 1993 or thereafter all US certified motor vehicles use R134A. Be sure of what you have before you spend money.
2006-07-02 17:34:11 · answer #3 · answered by hithere2ya 5 · 0⤊ 0⤋
You shouldn't have too. Most autos have a valve on them like a car tire has, when you unscrew it you will hear a little freon come out, but nothing will be lost. The noise you hear will much like checking the air in you tire. You will not need to add any back.
2006-07-02 17:39:28 · answer #4 · answered by Josh S 7 · 0⤊ 0⤋
no. it just screws out . there is a valve behind it to keep the freon in.....
2006-07-02 17:29:01 · answer #5 · answered by truthteller 5 · 0⤊ 0⤋