I have changed the electric fan temp switch and the fan motor and the fan will not turn on. The temp climbs up to 250 and wont turn on.

1987 Camaro- Does that car have two fans (square?)
I am thinking relays...I am sure another member will be able to offer placement locations/further testing info...

No it only has 1 fan. Where would the relay be located.

If I remember it is on the drivers side fender well.

The positive wire coming out of the fan should connect into the relay, if I remember right.

Did you check the fan for power/ground to it?

Does the fan run with the A/C on?

5.0 tpi has ect to pcm and pcm controls fan relay, if you ground the pin with the dk green wire it should turn on the fan. and the ect is likely bad. if not the relay or fuse or wiring is the fault.

if its the carb one, there is no ecm control, the dk green goes to the coolant switch on the engine, if you ground that and it works the switch is bad. if not same deal, relay/fuse/fuse socket/wiring

Fan does run with a/c on.

both the 5.0'* show two fans on the diagram, which engine is it? was it originally a 6 cylinder car?

Its is a 5.0/ 305 and it only has 1 fan and it never had a v6. It is the carburated 5.0.