I wanted maximum cooling under the following conditions:
A/C ON - Both fans on to help reduce heat produced in the engine compartment by allowing improved air flow through the engine compartment at idle.
A/C OFF - Both fans on when the temperature is above normal. Only one fan used to turn on in my car when the A/C was off and the temperature above normal.
I always wondered why both fans in front of the radiator didn't come on at the same time. One is for overheating for the cooling system and one is extra for when the A/C is turned on. Wouldn't it be better if both came on at the same time to cool off the engine quicker especially in hot weather where the A/C compressor will add to the heat and stress under the hood?
Well, I looked through the schematics and came up with a solution in my '99 and probably will work for the '00 too. I am shooting for maximum cooling under the following conditions:
A/C ON - Both fans to help in cooling and reduce heat produced in the engine compartment. Both fans on will flow air through the engine compartment better at idle.
A/C OFF and OVERHEATING ENGINE - I want both fans on when the temperature is above normal. Only one fan turns on in my car when the A/C is off and the temperature is above normal.
It's a 15 minute job taking your time. When one fan turns on, the other will also. This will cool down the engine much faster with the two fans on. For those in hot weather, I hope this helps.
Thanks to Hakuna for doing this on his M1 and giving me the idea for my 99.
Manuel De Brito
In this rewiring method
the electrical contacts within the Cooling Fan Relay carry and switch the
high current inductive electrical loads of two fans while designed to carry
the electrical load of only one. Although the relay's reserve design capacity
is unknown, it's likely not double as would be required for dependable operation
of this critical relay over time. A Cooling Fan Relay failure can result in
overheating and total destruction of the car's engine.
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22 June, 2008