Question about 1999 Oldsmobile Bravada

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No a/c No voltage to the a/c clutch n a 99 Old Bravada

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Check the a/c fuse in the underwood fuse block. It should be a ten amp fuse. If the fuse is good try swapping the a/c relay with another relay in the fuse block.

If that doesn't work than you will need a higher end scan tool to start checking the data in the VCM which takes inputs from the a/c switches and decides when to turn on the compressor.

Posted on Apr 18, 2014

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Hi' I'm Peter, First thing first check the AC fuse and relay. They are most likely in the fuse box in the engine compartment. The fuse if it has one could be there with the relay or it could be in the panel inside the car. You can run a jumper to make sure the clutch is operable if it gets power then I would check the pressure switch on the AC line. If you have a leak that has drained all of the R134a out then the pressure relay will not allow the clutch to engage to protect the compressor from damage. The pressure switch also sends a signal to the cooling fan to come on when the AC is operating. You may have to hook a set of AC gauges and run the engine possibly having to bypass the pressure switch to get a little Freon in the system. Try to let some Freon go in with out jumpering the compressor though if you can. Of course have the car running and at about 1200 RPMs, AC switch turned on. Watch your pressures so you don't over charge the system. How much do you put in? Well that is going to depend on several things, (1) How much is in the system? If there is already a charge in the system the only way to know is by watching your gauges and knowing the correct pressures which you can find a chart online that is based on ambient temperature. I could give you more information but depending on the situation with any AC work whether home or Vehicular you should be federally licensed. If you have lost so much 134a I try not to use the term Freon although that is what most people say. Freon is a brand name but has now become a generic term that people use for anything that goes in an air conditioning system. All that being said if you were lucky enough to get some in the system you can now see if the clutch will cycle on it's own. Not enough in the system and the clutch may engage for a second then cut off. Too much and it can make the compressor run all the time and not cycle plus the head pressure ( High side pressure) will get so high it will destroy the compressor causing possible injury or death but in the best case a new compressor , dryer, etc. If you have enough ahem ( FREON) in the system and you can jumper the clutch AND your High and LOW pressures are correct , every thing cools good then I would look at the pressure switch an easy replace just screw out the old and screw in the new and plug it back up. Run t to test. The only other possibility I haven't covered is the switch itself so you may have to test it also too make sure it's working. Really like I said extensive AC work should be done by a licensed pro but I understand needing to save a buck I just don't want you to get hurt or tear something up that will cost you more money. When a Pro works on it they will find out why the system is low , repair the leak replace the dryer , POA, orifice whatever then dry the system out with an inert gas to remove all moisture, pull a vacuum on the system, make sure it holds the vacuum verifying the leaks have been fixed then charge the system to the proper pressures , test it then give you a nice size bill. If a compressor is needed you can expect to spend at least $800.00 + for the parts and labor but it will be right , no legal or medical troubles. I know it's a long answer to your question but I don't know your level of expertise or experience so I am just trying to let you know as much as possible. Hey, who knows you may have a fuse that looks good but is bad . Always test them they may look good but be broken in a place you can't see. It happens more than you think. Good Luck my friend.

Posted on Apr 18, 2014


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