the only way i can turn my cooling fan on is to turn the A/C on. I have ha the engine temp as high as 250 Degrees and still nothing! any ideas of what it could be?

 

Faulty switch or falty wire leading to the switch.

 

I second that and it could be the fan as well. Hit the fan with 12vdc, unhook plug from fan, ground one side of fan and apply 12vdc from battery to the other, does the fan work?

 

Fan does work. When i did my engine swap i had one wire that i dont know where it goes. its Green with a white stripe. it comes from the fan relay could that have to do with it and where does it go?

 

thats it, it is supposed to go to the fan switch in the passenger head, if you run it to ground, the fan will run with the key on, it will work around town until you can fix

 

where is the fan switch exactially?

 

passenger head, between the back two exhaust ports,it is same hole that is between the front two ports on the drivers side(has the gauge sender in it on the drivers side)

 

ok thanks i will have to hunt it down and get it fixed! ill give u a update when compleated!

 

The fan switch that Dave Y is referring to is the heavy duty fan switch for the secondary fan. There is no per say coolant fan switch for the primary fan. It will come on when the A/C is turned on and when you jumper pins "A" & "B" of the ALDL. There is also the Fan A/C pressure switch in the high pressure line of the A/C system. Other than that the fan is operated by the ECM through the Coolant Temp Sensor in the intake manifold.

 

good point, is the set-up single or dual fan?

if single, what I said holds true, if dual, what trickster said goes

 

just a single fan!

 

well i did some looking. i found out that my new crate motor diddnt have a fan switch. The hole was pluged! Know where i can get a fas switch and about how much they coast?

 

just about any auto parts store, but a "cooler" switch would be my choice, as well. something like 200 on / 185 off.

KAM