1996 Lexus ES300 overheating after leaves AC open for 30 minutes!
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Join Date: Dec 2012
Location: tx
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There is a rather simple test to see if the cooling fan is operating properly.
On the passenger side of the engine compartment is a small diagnostic port. It is a black box about 1" X 3". It is just to the right of the passenger side strut. The top of this box opens up. Inside you will see several terminals. If you connect a jumper between terminals E1 and OP1 (with the engine running), the cooling fan should speed up. If it doesn't speed up, there is a problem somewhere in the cooling fan mechanicals and/or electronics.
As I mentioned above, the first check would be to make certain that the connection between the fan control module (inside the car under the glove compartment) and the power steering pump is in place and that there is no damage to this wiring connection.
On the passenger side of the engine compartment is a small diagnostic port. It is a black box about 1" X 3". It is just to the right of the passenger side strut. The top of this box opens up. Inside you will see several terminals. If you connect a jumper between terminals E1 and OP1 (with the engine running), the cooling fan should speed up. If it doesn't speed up, there is a problem somewhere in the cooling fan mechanicals and/or electronics.
As I mentioned above, the first check would be to make certain that the connection between the fan control module (inside the car under the glove compartment) and the power steering pump is in place and that there is no damage to this wiring connection.
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