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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
23,870 Posts
Welcome to Allpar. Do you have fault codes and a lit 'ck eng' light? Does the vehicle overheat when sitting?
Is the A/C compressor clutch actually engaging?
There is a refrigerant pressure transducer in the high-side refrigerant line that the PCM uses as an input to determine the need for cooling fans and compressor operation.
It sends that message over the bus to the TIPM (Totally Integrated Power Module-a 'smart' fuse/relay box) which which actually controls the fan and A/C clutch operation. It may select either fan as to the amount of cooling needed. Going at highway speeds with air blowing through the condenser and radiator, these fans may not need to run.
It may not turn these components and may store a fault code if there is a circuit condition or other problem where it would think that turning these components on would be unsafe (i.e.- a sensed short to ground). The TIPM faults codes can't be read with a regular engine code reader or in the odometer during a fault code check. You would need a more specialized scan tool to access these codes.
Cooling fan control (terminals #7 and #22) here: imagesWLinks
A/C clutch control (terminal #7) here: imagesWLinks
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