Hi,I want a simple way to wire second fan to come on with the first.
1989 iroc 305.thanks

 

Cut hot wire to second fan, splice to hot wire for first fan.

 

Wire the two fan relay control terminals together

 

Can I ask why? If the car running to hot?

 

How do i do that? and yes car is running hot and second fan does not come on.I replaced the switch.Where is the second fan relay?

 

how hot is HOT?

More to a circuit than just a switch.
Have you tested the fan motor to see if the fan actually works?
Does fan circuit have power to it , does the relay circuit have power to it , does the relay work ,fuses good , wiring good , grounds good , etc, etc , etc

both relays should have a green/ white control wire , join those two together , when one relay turns on the other will operate as well
(if everything outlined above is correct and working properly , no amount of rewiring is going to fix something that is broke )

 

Thanks, everything checks out good,put power to fan and it works.It gets to about 250 right below red mark

 

Is the air dam under the car in good condition? Theres really no need to have both fans ok all the time.

Did you change anything? Run low on coolant and have an air bubble trapped in the system now?

Thermostat stuck shut? Id trouble shoot the problem before trying to bandaid it with both fans on at once.

 

Is temp gauge working correctly?
Have you separately confirmed that the engine is actually at the temp shown on the gauge ?