I can't figure out which relay is for the main fan. There are 3 relays and only 2 fans that i know of. Can you help me out, please?
They are usually well marked in the manual and on the relay/fuse box cover on GMs.
One trick is to remove the cap from one of the relays and push it closed manually and see what runs.
After checking that position move it to the other and push.
If you work on them a lot you keep one with an open cap as a tool for checking circuits.
SOURCE: cooling fan blowing relay
Generally speaking, any time you have issues with a relay or fuse blowing again and again, there is a short somewhere in the circuit. It could also be the fan motor going bad, but I believe that is less likely. Does the fan motor spin freely when the engine/key is off? Does it happen when turning the air conditioning on or when the fan starts from the engine coming up to temperature or both?
Testimonial: "The first fan does not rotate as freely as the second fan. Sounds like a good lead"
SOURCE: can you switch your horn relay switch with you
If it looks the same, it is. Go ahead and switch them, but try the horn after you do it. If the horn still works, the relay is not your problem.
?€¢
A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The BCM and PCM/ECM command High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).
?€¢
A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
?€¢
When certain DTCs set.
The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
?€¢
DTC P0480 Cooling Fan 1 Relay Control Circuit
?€¢
DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit
?€¢
DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage
?€¢
DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage
?€¢
DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage
?€¢
DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage
?€¢
When the A/C is requested and the ambient temperature is more than 50?°C (122?°F).
?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).
?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).
?€¢
A/C refrigerant pressure exceeds 1655 kPa (240 psi).
?€¢
When certain DTCs set.
So
123 views
Usually answered in minutes!
×