Quote:
Originally Posted by duxthe1
I completely ditched the fan clutch and aux fans out front in my CE. I modified a 600W 203ch fan for a 124 shroud and built a controller for it. This allowed using a later style refrigerant temperature sensor instead of a pressure switch. I found out a couple of things along the way.
When dialing in the code for my fan module I found that I could run the fan full speed and still overheat sitting in traffic. Airflow was not the limiting factor. I found that if I held the accelerator to give a 750-800 RPM idle speed I could watch the temp gauge fall back to thermostat set point. At the ~600 RPM hot idle speed, there was insufficient coolant being circulated to handle a high heat load. I've been tuning the CIS module in my coupe and have electronically raised the idle speed. With these mods I never overheat. Absolute worst case scenario I see 93C, and am probably one of the coolest running 124s around. It took extraordinary measures to achieve this.
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What he said. On the OM603 you can get a smaller water pump pulley to spin the pump faster at idle. A similar pulley is available for the m103/m104. Between the small water pump pulley and electric puller fans behind the radiator, it completely fixed my overhearing issue especially at idle. A mechanical fan can only spin as fast as the engine. An electric puller fan can run max speed at idle. It never exceeds 90c now.
Prius electric fans retrofitted to the pull air through the w124 radiator. It ain't pretty but it works.
