Question about 1995 Isuzu Rodeo

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Do you have to vacum the system down to change a a/c high pressure switch

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No. The fitting at the switch has a valve in it,so unless the valve sticks and lets out the charge you will be ok.And even if it sticks unless you completely open the system you would not have to evacuate the system

Posted on Sep 06, 2010

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No you don't

Posted on Sep 06, 2010

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I have a 1998 oldsmobile intrigue 3.8 ltr. AC was blowing hot air. Vacumed system down. Now compressor wont start, wont take freon. Low pressure switch is not on receiver drier or firewall.


It should still take refrigerant even if the compressor isn't running--but it'll be a LOT slower. Whatever you do, DON'T jumper across the low pressure switch. That'll start the compressor clutch and the system will run with low or no refrigerant. The refrigerant is what carries the oil, so it'll burn up the compressor.

Jun 18, 2017 | Oldsmobile Cars & Trucks

1 Answer

I changed the ac compressor and dryer pumped it down and charged the system the compressor comes on for 3 seconds and cuts off. The clutch does not stay in gage. What could be the problem now?


Sounds like it's shutting off due to high pressures in the system. Do you have gauges to read the system pressures? One thing that would cause this is too much freon in the system, or too much oil. Did the compressor come with oil in it or did you add oil to the system? Too much oil and/or freon will give high pressures and the high pressure switch will shut the system off. Or the high pressure switch could be damaged, maybe even unplugged is a possibility. If it is plugged in you could try unplugging it and seeing if the compressor keeps running for longer than 3 seconds, if it does pressures might be too high. It could also be a bad relay getting hot and kicking off. Try switching relays and see what happens. Another possibility is the low pressure switch but not too likely in this case.

When the compressor shuts off, can you turn it by hand? If not, high pressures or even a bad compressor are possible.

Lot's of possibilities. Just have to wade through them. I'd start with the relay and then check the pressures.

Good luck.

Jun 21, 2014 | Cars & Trucks

1 Answer

Is the switch that turns on cooling fans the same switch that turns on the air compressor i just replaced compressor and other parts and had it vacumed out ,oiled and recharged . and compressor wont


possible you have a bad low or high pressure switch on a/c system bad causing compressor not to engage, find switchs and jump across wires and see if compressor engages

Sep 03, 2012 | Kia Cars & Trucks

2 Answers

I have noticed you can buy a/c recharge bottles to do it yourself. Is this as easy as they make it sound on the bottles? I've tried to find a service manual on-line but havent had any luck. Any help would...


it actually is, even though they do not have a high pressure gauge they base that you should just read the low pressure reading assuming your system is ok. Other than that yes its real easy.

Aug 04, 2010 | 1998 GMC Sonoma

2 Answers

I need to bypass so i can recharge the system the freon is to low


try a jumper wire across pressure switch terminals.

Aug 15, 2009 | 2006 Dodge Caravan

1 Answer

4 wheel drive not working


Vacume lines or vacume switch on transfer case,or vacume pod to front axle.

Jan 05, 2009 | 1993 Chevrolet S-10 Blazer

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