Quote:
Originally Posted by ps2cho
The cool harness mod is not what I need. I need to stop it getting to 100C point before the fans kick in. Out here when it hits 120F, its incredibly difficult to cool the engine down, its not a matter of fans turning on and it suddenly drops.
I need to make it so that it slows the rise.
So the cool harness mod is not what I need.
Also raising head pressures is the opposite of what I want. Increased head pressures increases condenser temperatures, which raises coolant temperatures, which raises condenser temperatures which lowers A/C cooling. Its a vicious cycle. Plus, I don't feel the need to contest with MB Engineering on pressures or reduce efficiency and longevity.
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I'd recommend checking out the EPC startek site and looking at the wiring diagrams. You'd need to check the Aux fan section (there's a Table of Contents link) and the A/C section (it's not linked but it's in the back).
That'll help with understanding your specific car, since there's 3 or 4 variations in the gas W124s and the diesels are also different for what happens at which temp or pressure.
Then I'd look at the Summit Racing site and see if there's an easy low price kit that lets you replace the function of the pressure-switch for the aux fan with a temp sensor. These fan controller kits vary from mid $20 range to multi-hundred racing applications. The specific link I posted appears to be a cheap (maybe $30 IIRC) temp-programmable option that lets you place a probe in the radiator fins (no drilling or plumbing changes required).
In Arizona, I'd definitely look at an install that is ignition switched, eg, when the underhood temp is 140 F AND the ignition is on, then the Aux fan runs at least at low speed. I suspect that is easily and cheaply do-able with one of the Summit Racing kits. This type of mod should not affect any of the safety cut offs or function of the OE climate control.