Hello and Welcome!
Yes there is whats called a "fusable link" wire that comes off the starter solenoid at the starter,,,,front side, lower engine area, and goes to the relay
I have included the wiring diagram for that circuit for you
Click here to download info
Best of luck my friend, Happy Hollidays and thanks for asking!
The thermostat will NOT affect the cooling fan....
If the engine cooling fan is not coming on, its an electrical issue.
If the radiator is not getting hot enough, that would be related to the thermostat.
Does the heater fan blow hot or cold air inside the car?
If the heater blower isnt working, then thats a whole different thing than the engine cooling fan. Which one are we working on please..