A/C help needed. Re. 87 Burb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72MARIO · 01-13-2004, 06:04 PM

We have a 87 burb the and the A/C has stopped working. When we checked for power at the compressor there was none. Why would there be no power ? Is there a swithch that could have gone bad at the inside controll ? We checked the fuse it's good any other Ideas ?

Thanks

Slonaker · 01-13-2004, 07:22 PM

If there is no freon (or low on freon), there is a switch that kills the power to the system. I don't know the details, but it is on one of the lines on the box on the firewall. It will be the lump with the wires going to it.

Slonaker

87 STEPPER · 01-13-2004, 08:22 PM

Slonaker is sorta right.

There's a pressure sw. mounted on the receiver drier take off the connector and jumper it then remove the connector on the compressor and hook up a test light to it and put the selector in any A/C position and see if you get pwr @ the compressor.

If so then you need to ck. the sys. for leaks & repair them and service it.

If not then it could be the sw. or a wireing problem but i'd look at the sw. first.

72MARIO · 01-13-2004, 09:30 PM

How do i jumper it ? I know that there is no freon. In the system. So that's my problem. But I want to make sure that when the switch is in the on postion the comperssor actually locks up and starts pumping.

Thanks

72MARIO · 01-13-2004, 09:31 PM

before I have the system Charged

87 STEPPER · 01-13-2004, 09:43 PM

To jumper the press. sw. just take a piece of wire about 2.5" long strip both ends and insert them into the connector cavity's

I reccomend not runing the eng. when doing this cuz you may cause damage to the compressor. If the sys. is sound you should be able to hear the clutch click when you turn it on place the Ign. key into the Assy position and turn the A/C on & off a few times.

If you dont hear anything then the clutch may be bad that's why i said to hook up a test light @ the compressor that way you know there's power or not.

01-13-2004, 06:04 PM	#1
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	A/C help needed. Re. 87 Burb We have a 87 burb the and the A/C has stopped working. When we checked for power at the compressor there was none. Why would there be no power ? Is there a swithch that could have gone bad at the inside controll ? We checked the fuse it's good any other Ideas ? Thanks __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-13-2004, 07:22 PM	#2
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	If there is no freon (or low on freon), there is a switch that kills the power to the system. I don't know the details, but it is on one of the lines on the box on the firewall. It will be the lump with the wires going to it. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

01-13-2004, 08:22 PM	#3
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Slonaker is sorta right. There's a pressure sw. mounted on the receiver drier take off the connector and jumper it then remove the connector on the compressor and hook up a test light to it and put the selector in any A/C position and see if you get pwr @ the compressor. If so then you need to ck. the sys. for leaks & repair them and service it. If not then it could be the sw. or a wireing problem but i'd look at the sw. first. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

01-13-2004, 09:30 PM	#4
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	How do i jumper it ? I know that there is no freon. In the system. So that's my problem. But I want to make sure that when the switch is in the on postion the comperssor actually locks up and starts pumping. Thanks __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-13-2004, 09:31 PM	#5
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	before I have the system Charged __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-13-2004, 09:43 PM	#6
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	To jumper the press. sw. just take a piece of wire about 2.5" long strip both ends and insert them into the connector cavity's I reccomend not runing the eng. when doing this cuz you may cause damage to the compressor. If the sys. is sound you should be able to hear the clutch click when you turn it on place the Ign. key into the Assy position and turn the A/C on & off a few times. If you dont hear anything then the clutch may be bad that's why i said to hook up a test light @ the compressor that way you know there's power or not. __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE



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