QuestionHow would I do that?------------------------
Followup To
Question -
I've bridged the switch and the the clutch did engage. So I plugged the switch in and it seems to be cycling again. But it is still blowing warm air. So I checked the R134 and when the system cycles the presure drops indicting it needs to be charged but when the clutch is not engaged it indicts it doesn't need charging. Is this normal or could the switch still be defective? Also if not the switch what else could it be and how can I test it? Thanks Ted------------------------
Followup To
Question -
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Followup To
Question -
1996 GMC Jimmy
V6 Vortec 4300
Vin code - W
A/C Refrigerant - R-134a
1. Where is the low pressure switch for the A/C located?
2. To test it can I just unplug it or do I need to bridge it with a paper clip, and if I do bridge it will it mess up the computer system or any thing else?
Thank you Ted
Answer -
WHY do you need to find it ?.
The LOW PRESSURE PORT for test purposes to where you connect you manifol (A/C) gages is usually mounted on the side of the receiver/drier (accumulator). If NOT there it is located on the LARGER metal A/C line. It comes from the factory with a BLUE plastic cap on it and the HIGH PRESSURE PORT has a RED plastic cap.
I have yet to encounter any problems bridging acroos the wire terminals within the pressure switch, However I do NOT use a paper clip. I use a fused 10 amp fuse link that you can purchase at any auto parts store. If you have a DEAD SHORT in the electrical wiring of the pressure switch and use a paper clip you can FRY other electronic components. Go BUY a FUSE link and a couple of 10 amp square plastic fuses.
If you are unsure and have a camera that you can send e-mail pictures, Take some pictures and e-mail them to me at:
meperganfortis@msn
and I will identify and tell you which one it is.
FOLLOW UP QUESTION
I need to find the low pressure switch because the A/C compress clutch is not cycling. It is not coming on at all. It is not seized up because I can turn it with my hand. I also charge the system.I know where the ports are. I need to know where the low pressure SWITCH is. Thank you for the info about using a fuse link that is a great ideal.
Thank you Ted
Answer -
The LOW PRESSURE SWITCH is a 2 wire component usually loacted on the receiver/drier (accumulator). If you can't find it there, it will be one the LARGER metal line of the A/C system.
If you still can't find it e-mail me some pictures of the engine compartment of the A/C components and lines and I will identify it for you and e-mail them back.
e-mail to me at:
meperganfortis@msn.com
autohelp
Answer -
Your pressure reading are always taken when the compressor is operating. The HIGH side is approximately 5 times the pressure of the LOW side.
Therefore, When the compressor is running and the manifold set reads for example 45 PSI on the LOW side than the HIGH side should be 225 PSI.
You need to find out EXACTLY what pressures you have when the compressor is operating.
It is most likely that you have a leak in the A/C system and or the LOW pressure switch is faulty.
autohelp
AnswerYou stated: So I checked the R134 and when the system cycles the presure drops indicting it needs to be charged but when the clutch is not engaged it indicts it doesn't need charging. Is this normal ?.
Answer: Yes, This IS normal.
You will need to find the freon LEAK somewhere in the A/C system and this requires the use of an electronic LEAK DETECTOR that works on the same principal as, Let's say a METAL DETECTOR. The LEAK DETECTOR seeks out the freon leak and emits a very loud screaming noise to indicate WHERE the leak is within the A/C system.
However, The LOW PRESSURE switch is quite common to failure and you can replace it by simply unscrewing it from the fitting on the Receiver/Drier (accumulator).
NO you will NOT lose any freon as there is a built in check valve within the fitting attached to the Receiver/Drier (accumulator).
Simply unscrew it and replace it. You just might be lucky and ONLY have a faulty switch, But don't count on it.
autohelp
