Recommendations for A/C repair shops
Moderator: TJDave
Recommendations for A/C repair shops
Anyone have a shop they would recommend, reasonable rates and fair parts prices?
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79chevy39.5's
- Posts: 1204
- Joined: Wed Apr 11, 2007 7:48 pm
initially when i bought the jeep in 2010 a fuse was blown under the hood. no need for it in alaska so i never worried about it.
after a while is seemed to be getting noisy even though the fuse was blown and the clutch was not engaging. i removed the A/C serpentine belt and put a non-A/C belt on and it quieted down because the pulley on the A/C clutch on the compressor was not moving.
so fast foward to present day in a location where A/C may be needed and I started troubleshoting the system. tested the resistance on the clutch and it was good so I replaced the fuse. turned the A/C on and the clutch did not engage. Checked the low pressure switch and it is closed as is the high pressure switch. so it's probably not one of those. did the old relay swap under the hood with another relay and both relays are operational. what i did find is that the relay under the hood is not getting it's ground from the ECU? which i assume is related to the inputs from the dash mounted HVAC controls (cold/hot position) and fan speed. i can manually engage the clutch by applying 12 volts. i can get the clutch to engage by adding a ground to the relay under the hood as well. i even put jumpers in the connectors for the hi and low pressure switches with no success.
so does all that make sense?
after a while is seemed to be getting noisy even though the fuse was blown and the clutch was not engaging. i removed the A/C serpentine belt and put a non-A/C belt on and it quieted down because the pulley on the A/C clutch on the compressor was not moving.
so fast foward to present day in a location where A/C may be needed and I started troubleshoting the system. tested the resistance on the clutch and it was good so I replaced the fuse. turned the A/C on and the clutch did not engage. Checked the low pressure switch and it is closed as is the high pressure switch. so it's probably not one of those. did the old relay swap under the hood with another relay and both relays are operational. what i did find is that the relay under the hood is not getting it's ground from the ECU? which i assume is related to the inputs from the dash mounted HVAC controls (cold/hot position) and fan speed. i can manually engage the clutch by applying 12 volts. i can get the clutch to engage by adding a ground to the relay under the hood as well. i even put jumpers in the connectors for the hi and low pressure switches with no success.
so does all that make sense?
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79chevy39.5's
- Posts: 1204
- Joined: Wed Apr 11, 2007 7:48 pm
Check the inside fuse box. The power for the switched side goes through the inside. I don't believe that you will get power or ground to the clutch if that fuse is out. I think it is #11 behind the dash.
Test the dash switch next.
Then. . .
Unplug the computer and test continuity between the two ends of the wire that goes to the relay. It goes, in series, through both switches. Since it is a ground switch, you can also use a piercing test light to see if it grounds out just outside the connector when you turn the switch on.
Test the dash switch next.
Then. . .
Unplug the computer and test continuity between the two ends of the wire that goes to the relay. It goes, in series, through both switches. Since it is a ground switch, you can also use a piercing test light to see if it grounds out just outside the connector when you turn the switch on.
79chevy39.5's wrote:Should be fine on mh just doing brakes. If you are not in a hurry I can help you out with it as soon as it leaves I have access to recover and charge what year is your jeep I assume 4.0. Ill pull up schematics tomorrow
1998 TJ 4.0
OG--Had already checked the inside fuse and it is good.
i have to first get a wiring diagram.
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