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The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Your best bet would be to take your vehicle to a qualified repair shop ! Relay Driven Dual Cooling Fan Diagnostics
there is 2 fuses that you have to check
one will be in the big fuse assembly in the engine bay, the other probably in the fuse assembly in the cab
If they prove ok then it is possible that the coolant temperature SENSOR is faulty and needs replacing
don't confuse it with the temperature sender which operates the temp gauge.
spin fans make sure there not seized check for power and ground to the fan connectors when the car is overheating if no power jump the temperture sensor or disconnect it depending on style fans should operate if no ground check wiring diagram and check ground connection and wire continuity if both power and ground are good replace fan brushes worn out
You will need to look up the temperature sensing switches. There will be some for the computer, some for any guages on your dash, and 1 or 2 for your fans. Go to the dealers parts counter, and ask for a parts breakdown. If they are nice they will print off a detailed picture of the sensors. Most likely a bad sensing switch, or a shorted contact.
That does not seem too abnormal to me. I believe you have a 195 degree F thermostat, so you should probably be a bit cooler than 230 that is for sure. You have got an engine temperature sensor, should be located on cooling port on intake, you have a coolant temperature sensor on rad. Have you put in a new thermostat?
I had this same issue happen to me with my heating/cooling unit (among other issues with the fan speed) about 6 times. They replaced the resistor 3 times and its fine. Luckily, the first 5 occurrences were under warranty and the dealer covered the 6th fix. I'm still not happy between this problem and issues 2x with the service engine and service air bags... I only have 26k miles on this thing and bought the truck brand new in Oct 2006.
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