Question about 1997 Chevrolet Malibu
This was AFTER testing everything & coming up empty handed...The switch works GREAT, does what is suppose to do, but w/MIL ON, driving in LIMP MODE isnt WORTH it! Found reversed polarity for the Fan MODE relay (where it plugs in to the fuse/relay center)...Its a 5 pin, so isnt just turned around..anyone know what could cause this to happen? (the switch got put in AFTER finding this issue) What REALLY gets me is, if the PCM notices output voltage CHANGE from the #2 fan circuit and sets the P1652, WHY CANT IT REALIZE THE ENGINE IS HOT & FANS NEED TO BE ON? Love the car, but this is getting ridiculous!
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Posted on Jan 02, 2017
SOURCE: Cooling fan wont work
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.
Posted on Sep 27, 2008
SOURCE: engine cooling fan not coming on
It may be the fan itself. Try to find the plug going to the fan, it should be close to the fan and might plug diresctly into the relay. Use two jumper wires straight from the Bat one from the pos+ side and one from the neg- side and plug them into the two holes in the connector the fan should start WATCH YOUR FINGERS. If it starts its elec prob before the fan if not its the fan.
Posted on Jun 12, 2009
SOURCE: cooling fans not working
Ok might sound stupid but did you check the fuses (maxy fuses 40 amps probably). I propose you to also check the fans grounds if they are not damaged or coroded.If OK then, if the fans work when you feed them electricity, if you're temperature gauge in the car works great, if you're solenoids click and you don't se a cut or worn out wire, then the problem comes from the fact that the PCM does not or can not triger the fans on. It could be that the cooler sensor signal doesn't get to the PCM (improbable since i think the PCM feed the IPC info on the engine, temp, volt ...) it could be the PCM triggers the fan but the signal never gets to the solenoid (open circuit or bad ground) or it could simply be that the pcm never trigger the fans on (internal problem). Start you're engine and start the A\C (it need to be fonctional), if one of the two fans starts, the PCM is ok.
PCM = powertrain control module
IPC = instrument panel cluster
Posted on Aug 06, 2009
You have 2 engine coolant sensors one on front of engine, near thermostat housing and the other on the right side of the engine above the starter motor. You probably need to change the other one.
Posted on Aug 19, 2009
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Jul 01, 2017 | Cars & Trucks
Nov 13, 2016 | 1999 Pontiac Grand Am GT
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
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