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jsears, ASE Certified Technician
Category: Nissan
Satisfied Customers: 20
Experience:  I have serviced many asian vehicles
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2000 nissan quest, replaced radiator fan and temp sensor today

Resolved Question:

2000 nissan quest, replaced radiator fan and temp sensor today and fan wont shut off now
Submitted: 8 years ago.
Category: Nissan
Expert:  jsears replied 8 years ago.
Hi -

What is the engine temperature when the fans stays on?
Does the fan stay on after you turn off the engine?
Customer: replied 8 years ago.

When I replaced the radiator fan it would not come on. I called the local nissan dealer and they told me to change the sensor which I did. It still did not come on after letting the engine warm up so I unplugged it while the engine was running to check the connection.

When I plugged it back in it started to work. Now it works whenever the motor is running;hot or cold. I should not say hot because it doesn't warm up now.

Expert:  jsears replied 8 years ago.
Ok.. Did some research here. Some possibilities. 1. There maybe a short to ground on the ground side of fan motor 2. or Is the A/C or defrost on the HVAC system?
3. There could be a short in the high pressure switch of the A/C system telling the on-board computer to ground out the fan relay(s) turning the fan on.
Attached is a copy of the schematic.

Customer: replied 8 years ago.
Jerry the fan in the diagram is the radiator fan, right?
Expert:  jsears replied 8 years ago.
jsears and 2 other Nissan Specialists are ready to help you