hey guys, new to this forum coming over from v6z24. i just bought my first tgp a few weeks ago and when i first started driving it after i shut it off, the intercooler fan would still run for a couple of minutes, now i can't get the fan to run at all, while my main fan still works fine. thanks for any help.

The fan running after hard runs or long highway driving is very normal. The fan ONLY comes on when the A/C is on, so that could be why its never coming on

check the relay under on the passenger side of the engine too...

BTW, if you wanted to you can also hook up a switch to the relay for either or both of the fans and then you can turn them on whenever you want.  Just takes grounding on of the terminals and it will kick it on.

Quote from: ProspeederThe fan running after hard runs or long highway driving is very normal. The fan ONLY comes on when the A/C is on, so that could be why its never coming on

Fan 1(puller)and fan 2(pusher)have an on/off temp set in the code.From my experience with the fans they come on at the desired temp even if the ac is off. :) hope this helps,Later

Iv only had the intercooler on come on when the a/c is on, or the car is ran hard or for long periods of time on the highway, i had my intercooler fan run for up to 15 minutes after 3-4 hours of 85 mph driving after i turned it off, and idled it for 3 minutes before turning it off, and it didnt drian the battery.

The Turbo Supplement Manual has this to say about the fans:
 

QuoteThe fan motors are activated by a coolant temperature switch.  A second switch can activate the circuit, depnding on A/C compressor head pressure to the condensor.

also...

QuoteSecondary coolant fan relay control closes at 104*C (219*F) with A/C off or when A/C is in operaton opens at 97*C (207*F) with A/C off

Perhaps, try to ground the ALDL connector like you would if you were going to check the codes and see if the secondary fan comes on... that will give you some idea if the fan itself is still working and also let you know that the ECM can still control when it comes on.

There's a prety long diagnostic procedure that you can follow for the fan but try that first.

if the fan doesn't come on with the ALDL grounded, next step is to ground terminal A3 (dk Blu/Wht) at the ECM with a fused jumper and see if it runs or not.

Still no?
leave fused jumper grounded at ECM
disconnect secondary coolant fan relay connector
measure the voltage fom terminal 1 (red) to ground
0 volts means check fusible element G and Red (2) wire for an open, battery voltage means keep reading


mak sure fused jumper is still grounded at ECM
Measure the voltage from terminal 2 (pnk/blk) to ground
0 volts = check pnk/blk(339) wire for an open
battery volts = keep reading


Make sure fused jumper is still grounded at ECM
Measure the voltage between terminals 1 (red) and 5 (dk blu/wht) at secondary colant fan relay connector (diconnected)
0 volts=check dk blu/wht (473) for an open
battery volts...keep goin.

Connect a fused jumper with 20 amp fuse between terminals 1 (red) and 4 (blk/red) at secondary coolant fan relay connector (disconnected)
coolant fan runs: relpace relay
doesnt run... keep goin.


Leave fused jumper connected a secondary coolant fan relay connctor
disconnect the connector from secondary coolat fan
measure the voltage between terminal B(blk/red) and ground
0 volts= check blk/red wire for an open
battery voltage- you guessed it... keep going.


leave fused jumper connected at secondary coolant fan relay connector
measure the voltage between terminals a (blk) and b blk/red of secondary coolant fan connector
0 volts- check blk(150) wire for an open
battery volts- replae secondary coolant fan relay.


There, if that don't fix it... your outta luck. ;)

ummmm....why don't you just put an OHM meter on the fan motor? It will have some resistance because it is a wound motor...but you are looking to see if it is faulty. You may also want to check voltage at the connector when the car is up to temp.

Quick question. Does the fan blade spin if you manually spin it by hand? Does your drivers seat move forward and backward? If it does not move then the 60AMP fuse is blown. I had my fan get packed with snow long ago. It then popped the fuse which has the power seats on the same circuit.

Now one thing...unless you have a bad ignition switch...all power to the ECM and controlling power to the relay box will be absent. If you turn the ignition/car off the ECM/Chip settings have nothing to do with it's function. You can hot wire the fan by appling ground to the relay coil leg...but as soon as the ignition switch is turned off so should the fan. 8)