1995 climate control issue
#21
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After further evaluation, here is what I've found. When the car is off, the relay input from the battery has power and nothing else.
With the car on, and the air conditioner completely shut down, the battery line is live, the blue/white line is live and the red/black line is live. The only line that is not live is the one that goes to the compressor
With the ignition on and the air conditioner completely on (ac on, manual on, and blowers on, all the lines are live except the one going to the compressor.
So, basically nothing changes at the relay from when the air conditioner is on or off.
Any ideas?
With the car on, and the air conditioner completely shut down, the battery line is live, the blue/white line is live and the red/black line is live. The only line that is not live is the one that goes to the compressor
With the ignition on and the air conditioner completely on (ac on, manual on, and blowers on, all the lines are live except the one going to the compressor.
So, basically nothing changes at the relay from when the air conditioner is on or off.
Any ideas?
#22
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Don't assume that the new relay is good.
My new relay for the auxiliary fan lasted 4 switches before it failed.
I either bought a dodgy relay (in Jaguar packaging) or there is an underlying fault that is causing an amperage spike to cause the relay to fail.
Or maybe I just bought a dog and it should be taken out and shot.
My new relay for the auxiliary fan lasted 4 switches before it failed.
I either bought a dodgy relay (in Jaguar packaging) or there is an underlying fault that is causing an amperage spike to cause the relay to fail.
Or maybe I just bought a dog and it should be taken out and shot.
#23
![Default](/forum/images/icons/icon1.gif)
After further evaluation, here is what I've found. When the car is off, the relay input from the battery has power and nothing else.
With the car on, and the air conditioner completely shut down, the battery line is live, the blue/white line is live and the red/black line is live. The only line that is not live is the one that goes to the compressor
With the ignition on and the air conditioner completely on (ac on, manual on, and blowers on, all the lines are live except the one going to the compressor.
So, basically nothing changes at the relay from when the air conditioner is on or off.
Any ideas?
With the car on, and the air conditioner completely shut down, the battery line is live, the blue/white line is live and the red/black line is live. The only line that is not live is the one that goes to the compressor
With the ignition on and the air conditioner completely on (ac on, manual on, and blowers on, all the lines are live except the one going to the compressor.
So, basically nothing changes at the relay from when the air conditioner is on or off.
Any ideas?
The relay low current feed from the aircon switch is always live whether the aircon is being called for or not.
One thing at a time: The system may, repeat may, be triggered by an inverted relay system. That is by the relay stopping receiving current from the aircon switch, rather than by starting to receive it. Only a guess mind, someone who has the wiring diagrams or actual experience, should be able to say for sure. To test for this, start the car, call for aircon, and remove the wire that comes from the aircon controls to the relay. See if the clutch kicks in. If the compressor does start, then duff switch/something similar in the aircon controls.
Report back, but if this test does not result in the aircons compressor starting, please do the continuity test of the wire from the relay to the compressor I mentioned in the previous post.
Greg
Last edited by Greg in France; 11-30-2012 at 02:30 AM.
#24
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To summarise: Low current side:
The relay low current feed from the aircon switch is always live whether the aircon is being called for or not.
One thing at a time: The system may, repeat may, be triggered by an inverted relay system. That is by the relay stopping receiving current from the aircon switch, rather than by starting to receive it. Only a guess mind, someone who has the wiring diagrams or actual experience, should be able to say for sure. To test for this, start the car, call for aircon, and remove the wire that comes from the aircon controls to the relay. See if the clutch kicks in. If the compressor does start, then duff switch/something similar in the aircon controls.
Report back, but if this test does not result in the aircons compressor starting, please do the continuity test of the wire from the relay to the compressor I mentioned in the previous post.
Greg
The relay low current feed from the aircon switch is always live whether the aircon is being called for or not.
One thing at a time: The system may, repeat may, be triggered by an inverted relay system. That is by the relay stopping receiving current from the aircon switch, rather than by starting to receive it. Only a guess mind, someone who has the wiring diagrams or actual experience, should be able to say for sure. To test for this, start the car, call for aircon, and remove the wire that comes from the aircon controls to the relay. See if the clutch kicks in. If the compressor does start, then duff switch/something similar in the aircon controls.
Report back, but if this test does not result in the aircons compressor starting, please do the continuity test of the wire from the relay to the compressor I mentioned in the previous post.
Greg
Worth testing for this too: just take the relay terminal that is connected to the aircon switch, and earth it while engine running, and see if the compressor starts.
#27
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I just used my AC for the first time and found out that the system is no functioning properly. Blower motors work fine but only warm air comes out of the vents. I charged the system hoping that would solve the problem but no luck.
It appears that the compressor is not kicking on. I am very very much a rookie when it comes to air conditioning. I don't even know what the compressor clutch is or where it is located to know whether it is operable or not.
It appears that the compressor is not kicking on. I am very very much a rookie when it comes to air conditioning. I don't even know what the compressor clutch is or where it is located to know whether it is operable or not.
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