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560 AC works intermittently

Tiny
LYSTGL
  • MEMBER
  • 1987 MERCEDES BENZ 560SL
  • 5.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 143,000 MILES
Start the car, AC works great. Original R12 still ice cold. Drive to where you're going, turn the car off, come back, and AC no longer runs. No blower, no compressor. Nada. Can be on min or max, nothing works. Go home, start following morning and everything fine again until you shut the engine off.
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Sunday, June 30th, 2019 AT 9:38 PM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Yep, common when the control head goes out in these cars. Here is a diagrams to show you how to replace it. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Tuesday, July 2nd, 2019 AT 3:43 PM
Tiny
LYSTGL
  • MEMBER
  • 4 POSTS
Another wrinkle I discovered the other day. Took to taking a towel along and when shutting off the vehicle, I put the towel over the in cabin temp sensor and, lo and behold, when I come back to it and start it up, the AC and blower run! Keeping the sun off the sensor seems to work. Looking high and low for a 12383005721 in car temperature sensor now but having no luck at all. No one seems to have these anymore. I may be totally wrong but I suspect one of these is less expensive than a climate control module so am hoping I can find one and that it's the problem instead of the module.
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Tuesday, July 2nd, 2019 AT 4:17 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
If the sensor shorts out it can cause this issue as well, finding the parts will be the issue, let me know what happens.
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Wednesday, July 3rd, 2019 AT 10:16 AM
Tiny
LYSTGL
  • MEMBER
  • 4 POSTS
Will do!
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Wednesday, July 3rd, 2019 AT 10:18 AM
Tiny
LYSTGL
  • MEMBER
  • 4 POSTS
Found a Mercedes dealership in Calgary Canada that has five of them still in stock.
Price is $89.00 Canadian or about $68.00 US. Downtown Mercedes (Scott) 403 232 6402.
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Wednesday, July 3rd, 2019 AT 11:08 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Good find :) let see if that fixes it which it should. Let me know.
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Wednesday, July 3rd, 2019 AT 1:12 PM

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