I was in traffic today in 100 degree weather with the AC on and the coolant temp reached 240 F. I checked my fans and my driver side fan is not coming on. I even checked with the AC on and it still wasn't turning. I'm sure both fans should come on regardless of the coolant temp if the AC is on.

Now the weird thing is that after I turn the car off, the driver side fan turns on along with the passenger side fan! They both run for a minute and then shut off. I checked the fuses and they're fine.

Any ideas on what my problem is?

 

Please anyone? I have to fix the car before the hurricane hits this weekend. I might have to use the car who knows....

 

I'm right there with ya...the fan died on her 02 this past week....have you checked the fuses and relays??

standby I have a link for you

here ya go.. http://forums.corvetteforum.com/c5-t...erheating.html

 

Thanks man, I'm sure it's not the cooling system though as it hasn't been opened or touched. Pretty sure it's electrical with the fan not working. The fuses look good. The relays looked good, I tried swapping the two 4 prong relays and had the same results.

 

yeah I did the relay swap too just in case one was sticking...sounds like you have the same problem I have. My buddy told me to check the connectors as they sometimes burnout and cause this issue. I was hoping to get it to him today or tomorrow but he has my other car there on the lift now getting the new motor put in so we are gonna try applying power direct to the fan and if that doesn't work we will pretty much be sure we need a new one. All I can tell you at this point is no AC and turn the heater on if it starts creeping up. That should help you limp through until you can fix it

 

Thanks for the advice. I suspect it's an issue besides the fan motor for me though, since both of them turn on once I turn off the car

 

If I could get some more help on this it would be greatly appreciated. I'd like to get this taken care of if I can before the hurricane hits Saturday. I might need the car in case of emergency.
Thanks in advance,
Adham

 

Turned on the car today and turned the AC on, the fan started to work. Both fans were working fine. Seems like a ground issue. Can someone tell me where the grounds for the fans are?
btw, I was running 221 degrees in traffic today with 95 degree weather WITH the AC ON.
Thanks

 

G102 passenger side near headlight assembly

 

Great thanks!

 

FYI -
The electric cooling fans are used to cool engine coolant flowing through the radiator. The fans are also used to cool the refrigerant flowing through the A/C condenser.
The electric cooling fans are controlled by the PCM. The PCM controls the ground path for the 3 cooling fan relays. The relays are used to control the high current flow to power the cooling fan motors. Both fans operate together. When minimum cooling is required, the PCM energizes cooling fan relay #1 and both fans operate at low speed, since the fans are connected is series through cooling fan relay #3. Cooling fan relay #2 and #3 are both OFF. When maximum cooling is required, the PCM energizes all three cooling fan relays. The left fan is still powered through cooling fan relay #1, but is now grounded through cooling fan relay #3. The right fan is now powered directly through cooling fan relay #2 and both fans operated at high speed.
The PCM will also enable the cooling fans after the ignition is turned off. When the engine coolant temperature exceeds 140°C (284°F) and the ignition is turned off, the cooling fans will be enabled on low speed.
<A href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=609469&psdid=180&evc =sm#ss1-609469">Low Speed Cooling Fans

The low speed cooling fans are controlled by the PCM based on the following inputs:

• The A/C system
• The Engine Coolant Temperature (ECT) sensor
• The Vehicle Speed Sensor (VSS)

The PCM will turn the low speed cooling fans ON when any of the following conditions exist at idle:

• Certain PCM Diagnostic Trouble Codes (DTCs) are set
• ECT above 104°C (219°F) will enable low speed fans
• A/C head pressure above 1510 kPa (219 psi)

Once the low speed fans are turned ON by Engine Coolant Temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F). If the low speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1034 kPa (150 psi). The minimum ON time for the low speed cooling fans is 50 seconds.
When engine speed is above 3500 RPM for 12 seconds and the engine oil temperature is above 127°C (261°F), the low speed cooling fans will be turned ON.
<A href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=609469&psdid=180&evc =sm#ss2-609469">High Speed Cooling Fans

The High Speed Cooling Fans are controlled by the PCM based on the following inputs:

• The A/C system
• The Engine Coolant Temperature (ECT) sensor
• The Vehicle Speed Sensor (VSS)

The PCM will enable high speed cooling for both fans when any of the following conditions exist:

• Certain PCM Diagnostic Trouble Codes (DTCs) set
• ECT above 109°C (228°F)
• A/C head pressure above 1551 kPa (225 psi)

Once the high speed cooling fans are turned ON by the Engine coolant temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F). If the high speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1241 kPa (180 psi). The minimum ON time for the high speed cooling fans is 26 seconds.

 

The fan grounds are at G102, passenger, forward, top frame rail, adjacent to the hood riser.

 

My fans always turn on after I turn off the car and the temp is nowhere near 284 F. Could this be from the tune I have on the car? Also, if the fans are both working and the AC is on, is the car supposed to reach 221 degrees in traffic? I've read that having the AC on lowers the temp since the fans come on

 

I'll go ahead and check the grounds and then go from there. I have had 3 blown fuses in the past month....same fuses 46 and 49

Update: Checked and cleaned the ground and it looked fine. It was tight and nothing was loose. I'll see if anything changes....

 

284 ?!?!???

 

the bulletin says that the fans will turn on after you turn the car off IF the temp is 284 F. Obviously my temp is nowhere near that high but my fans still turn on after shutting the car down