1971 LS5 AC Compressor not activating
Thread Starter
Pro
Joined: Jan 2016
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From: Ohio
1971 LS5 AC Compressor not activating
I had posted about AC Compressor issue Anti diseling relay was bad located on Air Box under passenger side dash, I replaced that. The main fuse by horn relay is good. The blocking relay next to the anti dieseling relay was bad and is no longer available. Trying an after market relay. If that doesn't work, I can remove both and put a jumper wire in anti dieseling relay plug. Has anyone done that, AC comes on with that when activated on control but high speed on blower doesn't work. Everything works fine but no high speed on blower.
Ted
Ted
Dr. Detroit
Joined: Mar 2012
Posts: 10,091
Likes: 4,016
From: New Braunfels Texas
Did you check/replace the high blower relay?
https://www.rockauto.com/en/catalog/...tor+relay,3088
Jebby
https://www.rockauto.com/en/catalog/...tor+relay,3088
Jebby
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
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From: Ohio
High Blower relay
That is the after market one I ordered. It has an extra prong. Original one had 3 prongs only. Not 4.
when I removed the metal cover on the old one, alot of rust came out if it. When I manually closed the contacts, high speed came on but the contacts wouldn't release when shutting off power.
i treid almost eveywhere to get an original relay, no luck.
Ted
when I removed the metal cover on the old one, alot of rust came out if it. When I manually closed the contacts, high speed came on but the contacts wouldn't release when shutting off power.
i treid almost eveywhere to get an original relay, no luck.
Ted
Dr. Detroit
Joined: Mar 2012
Posts: 10,091
Likes: 4,016
From: New Braunfels Texas
That is the after market one I ordered. It has an extra prong. Original one had 3 prongs only. Not 4.
when I removed the metal cover on the old one, alot of rust came out if it. When I manually closed the contacts, high speed came on but the contacts wouldn't release when shutting off power.
i treid almost eveywhere to get an original relay, no luck.
Ted
when I removed the metal cover on the old one, alot of rust came out if it. When I manually closed the contacts, high speed came on but the contacts wouldn't release when shutting off power.
i treid almost eveywhere to get an original relay, no luck.
Ted
Jebby
Last edited by Jebbysan; Jul 14, 2020 at 08:51 AM.
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
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From: Ohio
Relay
Hope so, everything else has been checked. I had all new O rings installed, compressor checked, cooler condenser repaired, new return tube from dryer. System held vaccum and charged. The shop had to jumper power to get compressor to come on. The last two possibilities were these two relays. I replaced thermal fuse/ anti dieseling relay, wasn't the issue. Then I went to Blocking relay/ high spd blower relay. That is where I found it full of rust. Like I said manually made contacts closed, everything worked fine. Points would not release though,
when high speed blower came on it was squealing then took off. Must not have been working for years.
Thanks
when high speed blower came on it was squealing then took off. Must not have been working for years.
Thanks
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
Likes: 12
From: Ohio
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
Likes: 12
From: Ohio
Thread Starter
Pro
Joined: Jan 2016
Posts: 534
Likes: 12
From: Ohio
Issue
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