cooling fan quit need help
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cooling fan quit need help
recently went on a road trip with my 2001 z06 and my passenger side radiator fan quit working. I am looking for anyone that might of had the same issue, and any advice I can get.
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Joined: May 2003
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From: Iowa
St. Jude Donor '03 thru '26
Race Director
Joined: May 2003
Posts: 14,137
Likes: 2,984
From: Iowa
St. Jude Donor '03 thru '26
Here is a description of how the fans work and at what temps they are turned on and at what temps they go to high speed operation.
Cooling Fan Control
The engine cooling fan system consists of two electrical cooling fans and three 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 and ignition 1 voltage from the underhood electrical center. The ground path is provided at G102.
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 cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage 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 3 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 cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan 3 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 3 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan 2 relay coil is energized closing the relay contacts and provides battery positive voltage 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.
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
People are always running around worrying about their temps because they see the numbers on the gauge. These cars are designed to work with high coolant temps and have no problems operating at the temps you indicate. As you can see the fans don't even get turned onto low speed until the temp hits 226 and don't go to high speed until the temp hits 235 degrees. At an autocross where we were running in heats and cycling through the runs quite fast I saw a 242 degree coolant temp on my C5Z for most of an event.
Cooling Fan Control
The engine cooling fan system consists of two electrical cooling fans and three 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 and ignition 1 voltage from the underhood electrical center. The ground path is provided at G102.
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 cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage 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 3 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 cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan 3 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 3 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan 2 relay coil is energized closing the relay contacts and provides battery positive voltage 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.
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
People are always running around worrying about their temps because they see the numbers on the gauge. These cars are designed to work with high coolant temps and have no problems operating at the temps you indicate. As you can see the fans don't even get turned onto low speed until the temp hits 226 and don't go to high speed until the temp hits 235 degrees. At an autocross where we were running in heats and cycling through the runs quite fast I saw a 242 degree coolant temp on my C5Z for most of an event.
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I over heated in traffic on Monday coming through dallas the passenger side fan never kicked on, came home and replaced all relays and checked fuses
can you only get the fan out through the bottom?
can you only get the fan out through the bottom?
Last edited by Agardner899; Jul 29, 2015 at 05:12 PM.
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Joined: Jun 2013
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From: Keego Harbor MI
I have a 96 with same issue. Not sure how similar they are (LT1 in mine) I have a fuse for secondary fan (passenger side) keeps blowing. I pulled fan on that side out to test. It works, so I am going to try and replace relays and see if that solves problem. I called dealer, can't get fan assembly and they only had one motor at (300.00) if this dosent work, I will be putting an after market in to replace this one. Anyway, on mine, I took out the four bolt holding fan in, but couldn't quite get it out, I had to loosen the ait conditioning parts in front of it (didn't remove any just took bolts out so I could slide them up a little, then fan came out the bottom no prob. Hope this helps some
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[QUOTE=Corvettewaldon;1590158996]I have a 96 with same issue. Not sure how similar they are (LT1 in mine) I have a fuse for secondary fan (passenger side) keeps blowing. I pulled fan on that side out to test. It works, so I am going to try and replace relays and see if that solves problem. I called dealer, can't get fan assembly and they only had one motor at (300.00) if this dosent work, I will be putting an after market in to replace this one. Anyway, on mine, I took out the four bolt holding fan in, but couldn't quite get it out, I had to loosen the ait conditioning parts in front of it (didn't remove any just took bolts out so I could slide them up a little, then fan came out the bottom no prob. Hope this helps some
i just ordered a replacement motor from gmpartdirect.com for $86 might want to look and see if you can find what your looking for cheaper
i just ordered a replacement motor from gmpartdirect.com for $86 might want to look and see if you can find what your looking for cheaper
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Probably a lot easier to disconnect the wiring harness (from the bottom) and then lift the entire fan assembly out the top. Remove the cover over the radiator and AC condenser (4 bolts). Trying to change out the motor without removing the entire assembly could be very difficult. Fan assembly is just clipped to the radiator.
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