A/C Compressor not working - Land Rovers Only

Triple R · 07-19-2006, 07:30 PM

Can anyone tell me where the thermostat is for the A/C. And is it hard to get to. My compressor is not cycling with selector set to A/C. I jumped the pigtail under the hood connected to the compressor and it worked and started to blow cold air inside. I located and checked the relay on the firewall and even swapped it out with another Bosch relay. No good. On one of the wires that connects to the relay there is 12v. I am missing the signal to activate the relay. When I applied 12v to the compressor I saw a little bit of bubbles then clear liquid in the seeing glass. Any suggestions are greatly appreciated.
Thanks in advance.

RageRover · 07-20-2006, 01:16 AM

What year is your RRC? If it is pre-1994, it may have the old R-12 system, but even so, if you have a 94 or newer, and have the R-134a system, you will have what they call pressure switches on the A/C lines.

You can easily identify them by the two wires that come out of them, and the cylinder shape on the A/C line. Most likely it is bad and causes the Compressor to not cycle.

Triple R · 07-20-2006, 05:11 AM

Sorry about that.It is a 1989. I believe the pressure switch is on the dryer. Does the system shut down if the levels are too low? Can you Jump the circuit to test the line or can you test the component itself. Thanks.

gordo · 07-20-2006, 09:04 PM

On my 89 it is almost always that dang relay you mentioned. I would check the fuses too. Also pull the wire off and check the voltage. More than likely there isnt any. Sorry I cant help more. Gordo

RageRover · 07-20-2006, 10:48 PM

I agree with Gordo, check the electricals first.

And yes the pressure switch will disable the compressor from engaging, preventing damage to itself and the whole system, if the level of refrigerent is too low.

I wouldn't recommend trying to jump a wire to the compressor to see if it is working with the engine running, but you can try it with the engine off. This will show if the compressor electromagnetic clutch is working. And if it doesn't engage while engine running, of course check the electricals.

Good luck man, I feel the heat of summer already, and I see why everyone wants the A/C to work.

Triple R · 07-25-2006, 06:39 AM

Thanks Guys..Considering I have cycled the compressor and have checked the fuses I will give a charge of R12 and hope for the best.

RageRover · 07-25-2006, 11:10 AM

Ok, cool, good to hear man.

Triple R · 07-25-2006, 03:56 PM

Meant to ask if the switch on the dryer is bad,can you remove without letting the freon out..Thanks

RageRover · 07-25-2006, 05:21 PM

Unfortunately no, you'd have to evacuate the system and then remove the switch. Then refill the system.

Triple R · 07-28-2006, 04:33 AM

Dang it..Maybe I will go for the R134 conversion from Atl British if that's the case. Thanks soo much for the insight..You guys rock...

RageRover · 07-28-2006, 12:32 PM

Yeah, that is usually what some A/C shops will ask you to do if you have the R-12 system, is to retrofit it to R-134a. I still need to retrofit my mom's 86 Benz 420 SEL to R-134a, as the system doesn't even work.

Triple R · 07-30-2006, 07:45 AM

Bad time to have no A/C. At the rate I am going I'll have it done just in time for the snow.

07-19-2006, 07:30 PM	#1 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	A/C Compressor not working Can anyone tell me where the thermostat is for the A/C. And is it hard to get to. My compressor is not cycling with selector set to A/C. I jumped the pigtail under the hood connected to the compressor and it worked and started to blow cold air inside. I located and checked the relay on the firewall and even swapped it out with another Bosch relay. No good. On one of the wires that connects to the relay there is 12v. I am missing the signal to activate the relay. When I applied 12v to the compressor I saw a little bit of bubbles then clear liquid in the seeing glass. Any suggestions are greatly appreciated. Thanks in advance.

07-20-2006, 01:16 AM	#2 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,887 Gallery: 0	What year is your RRC? If it is pre-1994, it may have the old R-12 system, but even so, if you have a 94 or newer, and have the R-134a system, you will have what they call pressure switches on the A/C lines. You can easily identify them by the two wires that come out of them, and the cylinder shape on the A/C line. Most likely it is bad and causes the Compressor to not cycle. __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Brush Gaurd, meant for a Jeep Grand Cherokee, now fitted to the RRC -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

07-20-2006, 09:04 PM	#4 (permalink)
gordo Senior Member Join Date: Feb 2006 Location: Bradenton, FL Posts: 279 Gallery: 0	On my 89 it is almost always that dang relay you mentioned. I would check the fuses too. Also pull the wire off and check the voltage. More than likely there isnt any. Sorry I cant help more. Gordo __________________ Gordo www.floridalandroverclub.com 00 P38 4.6 blinging 92 stocker RRC 73 hybrid wheeler

07-20-2006, 10:48 PM	#5 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,887 Gallery: 0	I agree with Gordo, check the electricals first. And yes the pressure switch will disable the compressor from engaging, preventing damage to itself and the whole system, if the level of refrigerent is too low. I wouldn't recommend trying to jump a wire to the compressor to see if it is working with the engine running, but you can try it with the engine off. This will show if the compressor electromagnetic clutch is working. And if it doesn't engage while engine running, of course check the electricals. Good luck man, I feel the heat of summer already, and I see why everyone wants the A/C to work. __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Brush Gaurd, meant for a Jeep Grand Cherokee, now fitted to the RRC -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

07-25-2006, 11:10 AM	#7 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,887 Gallery: 0	Ok, cool, good to hear man. __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Brush Gaurd, meant for a Jeep Grand Cherokee, now fitted to the RRC -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

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07-20-2006, 05:11 AM	#3 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	Sorry about that.It is a 1989. I believe the pressure switch is on the dryer. Does the system shut down if the levels are too low? Can you Jump the circuit to test the line or can you test the component itself. Thanks.

07-25-2006, 06:39 AM	#6 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	Thanks Guys..Considering I have cycled the compressor and have checked the fuses I will give a charge of R12 and hope for the best.

07-25-2006, 03:56 PM	#8 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	Meant to ask if the switch on the dryer is bad,can you remove without letting the freon out..Thanks

07-25-2006, 05:21 PM	#9 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,887 Gallery: 0	Unfortunately no, you'd have to evacuate the system and then remove the switch. Then refill the system. __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Brush Gaurd, meant for a Jeep Grand Cherokee, now fitted to the RRC -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

07-28-2006, 04:33 AM	#10 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	Dang it..Maybe I will go for the R134 conversion from Atl British if that's the case. Thanks soo much for the insight..You guys rock...

07-28-2006, 12:32 PM	#11 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,887 Gallery: 0	Yeah, that is usually what some A/C shops will ask you to do if you have the R-12 system, is to retrofit it to R-134a. I still need to retrofit my mom's 86 Benz 420 SEL to R-134a, as the system doesn't even work. __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Brush Gaurd, meant for a Jeep Grand Cherokee, now fitted to the RRC -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

07-30-2006, 07:45 AM	#12 (permalink)
Triple R Member Join Date: Jun 2005 Location: NYC Posts: 51 Gallery: 0	Bad time to have no A/C. At the rate I am going I'll have it done just in time for the snow.

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