Secondary fan on impala SS 1996 not operating. fan motor works, new sending unit, new relay installed What else could keep it from coming on?

The PCM is located directly underneath the air cleaner assembly (were the air filter is housed.) I have a 96 impala too.

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try to find a old Motors manual or Chiltons for it or ask the parts guy at a chevy dealer for it

I would start with checking the fuse and relay for that circuit. If that is fine then you will want to check the oil sending unit. If the sending unit breaks, the fuel pump will not work. Please state as much information as you can. Please write back with everything that you have tested and noticed. I will do my best to help. good luck.

First off keep in mind that your fan is controlled by temp sending unit which sends a GROUND signal to the fan relay, which opens the curcuit to turn on the fan . Your fan has a CONSTANT 12volt supply going to it which is supplied buy a fuse .
With that being said, check with a volt meter to see if you have power (12 volts) at the fan plug . Ground the negative lead of your volt meter to the batter

I have a 96 Impala SS I'm ready to smog but DTC code P1642 which is fan relay I replace it after three days the relay blow out and engine came on,the passenger fan is working but the driver fan is blowing out.

If you go to autozone or advance you can buy a new fan motor or a fan assembly. If the fans used to run on and off together then I think you just have a bad motor. On the other hand if they were not a duet, then you may have a sensor problem. No doubt each has a plug on it, disconnect the plug on the one not working and jumper it directly to your battery. Use an old extension cord on which you have bared the ends. If it spins then the fan is good and your problem lies elsewhere. If it does not spin then it is bad and your choice it to get a motor and install it in the plastic frame or remove the plastic frame and replace the whole deal. I would go with the whole deal myself so you do not have to replace the other motor come January.

on your car are two sensors one is an engine temp sensor the other is a coolant temp sensor
change the coolant temp sensor that is what goes bad most of the time when the water gets to 210 degrees the coolant temp turns on of that is working change the radiator fan relay

no, more likely a bad blower motor thermal limiter in the blower motor resistor

I am not the most mechanical guy and i did it with out much problem. You can get the fans at alot of car parts houses. i just layed under neith the front bumper and there were only a couple of screws and a connector to plug back in.

Hi,Your car have one auxiliary fan that comes on when you turn the air on if this fan stops working the motor overheat ,there is a fuse and a relay for this fan ,,check both of them first ,if they are good check the fan motor ....