why is my van overheating? on 1998 Chevrolet Venture

the fans dont come on unless i turn on the heater. i changed the coolant temperature sensor but that didnt seem to work. i have checked all the fuses.

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1 answer 3 comments
coolant temp sensor poss is the computer sensor. you need to test the raditor fan sensor and relay these are 2 diff sensors
ok how do I test these?
YOU NEED VOLT METER AND RELAY TESTER. BOTH ARE CHEAP PARTS YOU MAY JUST WANT TO REPL AND SEE WHAT HAPPENS
ok i will have to try and get those things first.