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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36 /7 Z3 (1996-2002)

E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #26  
Old 06-14-2013, 08:37 PM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 876
Mein Auto: 1998 Z3 Roadster
The refrigerant pressure switch is on the receiver/dryer under the headlight. You can use a jumper wire at the plug to see if that's the problem.
There is also a temperature sensor switch mounted on the side of the compressor in the wire that goes to the clutch. However, it's downstream from the plug, so if you don't have 12v at the compressor plug, that's not your problem.
The A/C compressor relay is a yellow one (BMW: 61361389105, Siemens: V23134-K52-X181) and there is another one in the box. You could swap the two. If that doesn't work, start checking the voltages at the relay plug.

Last edited by Blacklane; 06-15-2013 at 07:40 AM.
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  #27  
Old 06-15-2013, 01:33 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
Join Date: Oct 2012
Posts: 59
Mein Auto: 1994 Mercedes E320
Have 12 volts on 2 wires to the refrigerant presssure switch (only pressure switch on the drier), plug it in it controls the electric cooling fan in front of the condenser, ohmed out the wires leaving the plug, found them both to be in the fan relay socket, jumped out the wires from the pressure switch, high and low speed for fan, swapped relays, both operate the same. Ohmed out the wire from the compressor plug to the relay socket, good continuity, jumped from power source in the relay socket, compressor clutch energized. Still unable to find source of power for relay coil. I am now wondering if the evaporator temperature sensor may be bad. Am going to look for it and try to ohm it out to see if its open, closed or has a variable resistance with temperature change.
Any other suggestions? Thanks for all the help with this, and the other questions I have had.
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  #28  
Old 06-17-2013, 04:47 AM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
 
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Mein Auto: 1998 Z3 Roadster
How about the A/C switch in the cockpit? I had one of those go bad once. I also think the evaporator temp switch is likely, but I don't know where it is right off. You sure have eliminated a lot of things.
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  #29  
Old 06-17-2013, 06:35 PM
senikc senikc is offline
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Location: Milledgeville, Ga
 
Join Date: Oct 2012
Posts: 59
Mein Auto: 1994 Mercedes E320
I think the switch is ok, It lights up and the auxiliary radiator fan runs. Unless the switch is a double pole switch. I am thinking it must either be a bad evaporator temp sensor or bad connection to it.

Thanks for all your help on this and all the other Z3 issues I have had, I am about ready to give up on the service engine soon light issue and take the car to BMW dealer.
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