E320 Cooling Problems

[earossi]

I have a 95 E320 that contimues to have an overheating problem due to the auxilliary fans not coming on. I have researched this board on the problem and ways to troubleshoot it, and there are some discrepancies that I would like to have cleared up. First, my understanding is that both fans are off or on together (no single fan operation). Next the fans run on low speed when A/C line pressure trips an overpressure switch. The low speed is produced by a resistor which is in that circuit (I assume in series with the fans?). The fan high speed is triggered by a thermo switch located on the thermostat neck. There seems to be some confusion on how to test the thermo switch. Some posters say that merely removing the connector (which produces infinite resistance across the connector) will activate the fans. Other posters have suggested grounding or jumping the connector pins on both the A/C pressure switch or the thermoswitch. Whether it be the overpressure switch on the A/C or the thermoswitch.......do both switchs operate through the SAME relay? There are two connectors on the thermostat housing. One, a two wire connector, while the other appears to have 3 or 4 wires. Which one is the thermoswitch? Lastly, where in the wiring harness is the EASIEST place to jump battery voltage to test each fan? Sorry for the long post, but troubleshooting these fans seems pretty straightforward, but is proving otherwise. I would appreciate it if someone would confirm my understanding and provide some insight to solve my problem.