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Im Going to be installing my Contour dual electric fans. There are only 2 wire hook-ups on it, + and -. i know i can simply splice the dual AC puller fan harnesses together so i can pull twice the current. There is no need to add aftermarket wiring or pull power from the fuse block or add a thermostatic switch.
The operation of the Pull-type/suction fan motors:
When the ignition switch is turned on the current flowing to the guage fuse flows to terminal 2 of the condenser fan relay -> Terminal 4 -> Terminal 1 of A/C high pressure switch -> Ground, energizing the condenser fan relay. Thus causing current to flow to terminal 1 of the relay flows to terminal 3 -> Terminal 2 of the condenser fan motor -> terminal 1 -> Ground, causing the motor to rotate. This occurs when the refrigerant pressure exceeds 220psi with the A/C high pressure sw on, or when the water temp is 100*C (212*F) or more with the A/C water temp sw no. 2 on.
When the refrigerant pressure is 178psi or less with the A/C high pressure switch off or the water temp is 95*F (203*F) or less with the water temp SW off, the motor does not rotate.
So, even with no pressure in my AC system, my AC fan wiring will be energize when my coolant temp hits 100*C. unfortunately, thats about 10* hotter than im comfortable with. id like my AC water temp sw no. 2 to close the circuit at a lower temperature.
anyone have any idea if toyota had an AC water temp switch that closes at about 202*-204*F? then i could just swap them out on my water neck, retain the factory relability of the relay/failsafe system and have my bad-ass fans work like toyota intended.
The operation of the Pull-type/suction fan motors:
When the ignition switch is turned on the current flowing to the guage fuse flows to terminal 2 of the condenser fan relay -> Terminal 4 -> Terminal 1 of A/C high pressure switch -> Ground, energizing the condenser fan relay. Thus causing current to flow to terminal 1 of the relay flows to terminal 3 -> Terminal 2 of the condenser fan motor -> terminal 1 -> Ground, causing the motor to rotate. This occurs when the refrigerant pressure exceeds 220psi with the A/C high pressure sw on, or when the water temp is 100*C (212*F) or more with the A/C water temp sw no. 2 on.
When the refrigerant pressure is 178psi or less with the A/C high pressure switch off or the water temp is 95*F (203*F) or less with the water temp SW off, the motor does not rotate.
So, even with no pressure in my AC system, my AC fan wiring will be energize when my coolant temp hits 100*C. unfortunately, thats about 10* hotter than im comfortable with. id like my AC water temp sw no. 2 to close the circuit at a lower temperature.
anyone have any idea if toyota had an AC water temp switch that closes at about 202*-204*F? then i could just swap them out on my water neck, retain the factory relability of the relay/failsafe system and have my bad-ass fans work like toyota intended.