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Re: a/c compressor not engaging [message #345212 is a reply to message #345140]

Sat, 13 July 2019 02:14

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma:

Senior Member

HI Deb. This is meant as a compliment. You can not believe how great it is to have someone here giving complete on topic information when requesting help. I have not commented on this thread because everybody here has been giving you good responses.

I agree that you have two different problems and that you need to fix the blower problem first. A couple of comments on the blower motor problem and you may already know this.

There are two different power sources for the blower motor. The first is through a 25 amp fuse and it supplies voltage to the blower motor through the fan switch and the blower motor resistor for all speeds EXCEPT the highest speed. In the highest fan speed this same circuit powers the fan relay coil.

Energizing this relay coil changes the power for the blower to a different power source. This source is a wire with fusible link direct from the center terminal of the isolator which is effectively direct from the alternator. So in the high speed fan switch position power from the 25 amp fuse will energize the relay coil (you can feel it if you hold the cover while someone else moves the switch to high and back) but if the engine alternator is not running, then no power will be applied to the blower motor from the isolator / alternator connection.

So if all speeds fail suspect the 25 amp fuse.

If only high speed fails WITH THE ENGINE RUNNING suspect the high speed wire, or the inline fusible link (not the one on the relay) or fuse, or relay, or burned connections which are very common.

If only one or more low speeds fail but high speed works, suspect the fan resistor, or fan switch, or again a burned connection on either or these or the fan relay.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

[Updated on: Sat, 13 July 2019 13:23]

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[Message index]

		a/c compressor not engaging By: Deb on Thu, 11 July 2019 14:36
		Re: a/c compressor not engaging By: lqqkatjon on Thu, 11 July 2019 15:02
		Re: a/c compressor not engaging By: Deb on Thu, 11 July 2019 15:34
		Re: a/c compressor not engaging By: Deb on Thu, 11 July 2019 17:34
		Re: a/c compressor not engaging By: roy1 on Thu, 11 July 2019 20:40
		Re: a/c compressor not engaging By: Deb on Thu, 11 July 2019 21:10
		Re: a/c compressor not engaging By: Deb on Thu, 11 July 2019 22:02
		Re: [GMCnet] a/c compressor not engaging By: emerystora on Thu, 11 July 2019 23:16
		Re: [GMCnet] a/c compressor not engaging By: Deb on Fri, 12 July 2019 00:00
		Re: [GMCnet] a/c compressor not engaging By: roy1 on Fri, 12 July 2019 00:46
		Re: [GMCnet] a/c compressor not engaging By: emerystora on Fri, 12 July 2019 08:29
		Re: [GMCnet] a/c compressor not engaging By: Deb on Fri, 12 July 2019 13:59
		Re: [GMCnet] a/c compressor not engaging By: Deb on Fri, 12 July 2019 17:01
		Re: [GMCnet] a/c compressor not engaging By: 6cuda6 on Fri, 12 July 2019 18:10
		Re: a/c compressor not engaging By: Chris Tyler on Fri, 12 July 2019 06:06
		Re: a/c compressor not engaging By: Ken Burton on Sat, 13 July 2019 02:14
		Re: [GMCnet] a/c compressor not engaging By: Ken Henderson on Sat, 13 July 2019 06:41
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sat, 13 July 2019 11:23
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sat, 13 July 2019 16:38
		Re: [GMCnet] a/c compressor not engaging By: Ken Burton on Sat, 13 July 2019 23:48
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sun, 14 July 2019 13:58
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sun, 14 July 2019 15:12
		Re: [GMCnet] a/c compressor not engaging By: Ken Henderson on Sun, 14 July 2019 15:41
		Re: [GMCnet] a/c compressor not engaging By: 6cuda6 on Sun, 14 July 2019 16:40
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sun, 14 July 2019 16:43
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sun, 14 July 2019 17:17
		Re: [GMCnet] a/c compressor not engaging By: Ken Burton on Sun, 14 July 2019 17:44
		Re: [GMCnet] a/c compressor not engaging By: Deb on Sun, 14 July 2019 18:59
		Re: [GMCnet] a/c compressor not engaging By: emerystora on Sun, 14 July 2019 14:35
		Re: [GMCnet] a/c compressor not engaging By: Deb on Mon, 15 July 2019 09:55
		Re: [GMCnet] a/c compressor not engaging By: Deb on Mon, 15 July 2019 12:38
		Re: [GMCnet] a/c compressor not engaging By: emerystora on Mon, 15 July 2019 13:22
		Re: [GMCnet] a/c compressor not engaging By: Deb on Mon, 15 July 2019 13:39
		Re: [GMCnet] a/c compressor not engaging By: k2gkk on Mon, 15 July 2019 14:14
		Re: [GMCnet] a/c compressor not engaging By: Deb on Mon, 15 July 2019 14:53
		Re: [GMCnet] a/c compressor not engaging By: Deb on Wed, 14 August 2019 13:53
		Re: a/c compressor not engaging By: jhbridges on Wed, 14 August 2019 15:58
		Re: a/c compressor not engaging By: JohnL455 on Wed, 14 August 2019 17:52
		Re: a/c compressor not engaging By: JohnL455 on Wed, 14 August 2019 17:54
		Re: a/c compressor not engaging By: Deb on Wed, 14 August 2019 18:27
		Re: a/c compressor not engaging By: JohnL455 on Thu, 15 August 2019 11:28

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