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Ac clutch not engaging

I wanted to bypass the ac clutch relay first to see if that is even working and so that I can recharge the system. But I'm not sure how. I have a 5 prong relay that are numbered 1-5. I have heard of connecting 30 to 87 but my relay doesn't have those numbers.

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There is a long round bottle looking thing. By the fire wall and heater hoses. There is a two prong plug on it. It is a pressure switch that keep the system from running with no freon in it. Pull it off and put a jumper wire from one plug to the other and pump will run. Warning will seize pump if you run for a long period of time. So remove wire after test.

Posted on Feb 17, 2014

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Posted on Jan 02, 2017

alicantecoli
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SOURCE: ac not working

if you by passed the relay and clutch engaged then this shows that pump works ??but was it getting cold on and around the restrictor valve where the pipes enter the cab is normally a valve block but american monsters use a valve in the pipe for cooling and if its not getting cold their or blowing cold inside cab then system needs re-gassing with R 134 gas if its an older system with R 12 gas then it will need to have adaptors fitted to valve connections and refilled with R134 gas.The main cause of A/C system loosing gas is porosity in the rubber flexible pipes also the back seal on the pump.Or just regass and put a leak stopper in the system

Posted on Nov 04, 2008

  • 155 Answers

SOURCE: recharge ac run bypass

more like run a bypass on the low pressure switch

Posted on Mar 27, 2010

honeymokey
  • 3113 Answers

SOURCE: ac clutch-1988 buick regal

It's low on freon

Posted on Apr 09, 2010

emissionwiz
  • 75822 Answers

SOURCE: No power to AC clutch 1994 olds cutlass ciera 3.1 litre

Have you tired jumping the AC compressor low pressure switch?

Posted on May 25, 2012

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Hi, the system will not engage the clutch if the pressure is low. It is likely your system needs a recharge. Since you know how to bypass, you can recharge the system yourself by purchasing a can of refrigerant and using a A/C recharge hose on the low pressure port. Please see my tip at http://www.fixya.com/cars/r5833579-auto_truck_c_recharge . These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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This could be a few things. The freon could be low, one of the switches (high or low pressure) could be bad, or you could have a bad compressor clutch. You can test the clutch by checking for battery voltage and ground at the two pin connector with the A/C on if you have both power and ground, then the clutch is bad. You really should start by hooking up pressure gauges to the A/C ports to check the pressures, and these vary depending on ambient temperature and whether the A/C compressor is engaged or not. I am willing to bet that the freon is low though and may be just as simple as recharging the system.
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1 Answer

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to prevent damage to the air conditioning system there is a "low pressure switch" located on the condenser near the low pressure hose (large one) .. if the refrigerrant (R134A) gets too low then the clutch will be blocked from activating by that switch .. you can have your system tested and recharged or you can do that yourself .. the R134A is available at auto parts stores .. some come with a gague that is required for proper charge .. if you dont already have a gage then yoiu will need that one ... recharge kits often come with instructions .. other less likely but possible problems could be a fuse or bad AC clutch relay. sometimes damaged wiring or bad clutch will be the problem but much more likely just low fluid ..

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if you by passed the relay and clutch engaged then this shows that pump works ??but was it getting cold on and around the restrictor valve where the pipes enter the cab is normally a valve block but american monsters use a valve in the pipe for cooling and if its not getting cold their or blowing cold inside cab then system needs re-gassing with R 134 gas if its an older system with R 12 gas then it will need to have adaptors fitted to valve connections and refilled with R134 gas.The main cause of A/C system loosing gas is porosity in the rubber flexible pipes also the back seal on the pump.Or just regass and put a leak stopper in the system

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here is a link to your problem and a solution:
http://en.allexperts.com/q/4-Wheel-Drive-2700/2008/5/C-Clutch-engaging.htm

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