Radiator Fan and A/Compressor not working.

[ronnie justice]

Noticed my Radistor fan was not working the other day. Hot wire the fan direct and fan is ok. I also have Power to relays. 5a rlys fuse is good. After sitting for a day I came back and tried it again by turning the A/C on and the fan worked for a second then the a/c clutch disengaged and the fan stopped working a I can’t get either to work again. I tried swapping out relays as well. I have not run the vortex diag stuff yet since my problem with the fan seems tied to the A/C. Btw I know refrigerant is low but the rad fan should still work right?

 

[THensley]

If low on gas in the ac low-pressure switch shut the ac compressor off and if water temp is below turn on temp the fan will not run

 

[ronnie justice]

The fan never comes on. It should come on at 170 is. Car will get close to 200 and not turn on. Only reason I mentioned A/C is because when I got it to work breifly I turned the AC on and the clutch engaged. Now I can’t get the clutch to engage either. And no fan.

 

[corsair231]

Is this on a stock car? Assuming stock, do you have a chip in it with the fan-on temp set to 170 degrees? What temp thermostat do you have?

 

[ronnie justice]

Stock fan. TT chip, 160 tstat

 

[corsair231]

Is the chip programmed for a 160 tstat? Our fans are computer controlled. The chip needs to match the tstat. Not sure what factory turn on is but IIRC these cars came with a 195 tstat so factory turn on will be over 200 and like THensley said above, if the a/c compressor is not on, the fan won't come on. If you have access to a decent scan tool, you can see the temp the computer sees and might give you a better idea of what is going on.

 

[salvageV6]

Ground the thinner Dark green or Dark green/yellow stripe wire on the relay (leave the plug connected to the relay) with a needle or probe to a good ground.
Key in the ON position, do the fans turn on then? Should operate as follows:
Dark Green wire triggers the low speed operation.
Dark Green with Yellow Stripe wire triggers the high speed operation.
Assuming you have checked for +12 on the brown wire at the relays and the fat red wire on the relay connectors has +12 on it at all times from the fusible links.

 

[ronnie justice]

Is the chip programmed for a 160 tstat? Our fans are computer controlled. The chip needs to match the tstat. Not sure what factory turn on is but IIRC these cars came with a 195 tstat so factory turn on will be over 200 and like THensley said above, if the a/c compressor is not on, the fan won't come on. If you have access to a decent scan tool, you can see the temp the computer sees and might give you a better idea of what is going on.

Let me just say that the fan has worked fine with the current chip for the past year. Stopped working last week.