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  #1  
Old 07-27-2020, 11:14 PM
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Heat sensor switch on a/c - is that a ground?

82 240D W123
The heat sensor switch on the a/c receiver-drier that turns on the auxiliary fan to cool the a/c condenser. Does that just connect the circuit when hot and disconnect when cold? It's just a ground wire connection for the circuit (or relay circuit), isn't it?

Part number 0065451424

Jim

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Heat sensor switch on a/c - is that a ground?-006-545-14-24-m322.jpg  

Last edited by jimmypete; 07-27-2020 at 11:21 PM. Reason: Added photo
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  #2  
Old 07-28-2020, 12:01 AM
wrench dropper
 
Join Date: Oct 2014
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Looks that way to me but I'll let you decide.
https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/ETM/123%20turbodiesel_2.pdf
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  #3  
Old 07-28-2020, 02:31 AM
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Quote:
Originally Posted by 300TD1982 View Post
Indeed it appears that it is a ground. Thank you for the schematic. Also appears to have the alarm rig that I asked about in the other thread. I had no idea this car had an alarm but apparently it does, although I'm not sure it has all the components.
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  #4  
Old 07-30-2020, 12:35 AM
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The switch you show does indeed complete a ground, thereby activating at 100c the aux fan by way of the aux fan relay. However this switch senses engine coolant temp.

The switch that senses R12/134A temp at the receiver/dryer has 2 connectors to complete the circuit and activates at 62c the aux fan thru the same relay.
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Old 11-15-2020, 04:00 PM
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Thank you. I'm gonna have to trace these wires, I've re-rigged it twice lol.
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  #6  
Old 11-16-2020, 11:36 AM
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Quote:
Originally Posted by jimmypete View Post
82 240D W123
... The heat sensor switch on the a/c receiver-drier ...
Part number 0065451424
Jim
Your car may vary. That temp sensor on my 1984 300D has a much smaller screw and 2 terminals. I recall one terminal goes to ground. It is on the coil- side of the fan relay, which you find mounted on the top inner fender driver's side (under plastic cover). A 2nd relay there actuates the AC compressor clutch.

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