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Originally Posted by WopOnTour
Yes, but that defeats the purpose. What you are proposing wont work to run the fans and CAC pump with the engine and ignition OFF.
Wop
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You are obviously very knowledgable on this system and the whole solid state driver portion of the PCM that actuates the cooling system. I don't know about the CAC pump portion of what I am about to talk about since the control system for the CAC pump seems to not be mentioned in the FSM basic schematics.
In the system description though (page 6-572 for the 2.0L engine) it says "After the vehicle is shut off if the engine coolant temperature at key-off is greater than 284F and system voltage is more than 12V the fans will stay on for approximately 3 minutes".
I would use a rheostat in series with the ECT. The reason-
-it is a simple mod to make.
-It would only cool for 3 minutes if the vehicle was off and be a reasonable drain on the battery and not need an additional power source. In summer whether (85F assumed) with no CAC pump energized (although I am not sure this would help any thing any way). Temperatures should lower from a real value of 220 to 190F (actual calculated on is 176 but the thermostadt would start to close so 190F is a swag).
-If the engine were running it would work to cool the system just fine.
Bottom line it would really depend on the end user and what he would want but if it were me I would't want the additional weight of a battery or power source or the hassle of remembering to turn it off and not drain my battery down.
I am curious now about the CAC control system.