1991 Buick Park Avenue cooling fan

First of all thank you so much for your donation.I need to know what your 8th digit of your vin is.Let me know what it is so i can help you.

8th digit of vin is L

If your a/c work's turn it on does your fan come on?If your a/c doesn't work then locate your a/c high low switch turn on your a/c and unplug the high low switch jump across the two terminals the a/c should kick on and so should the fan did it?Let me know this will test the wiring relay fuse's fan motor make it a lot easier to figure out.I posted a diagram of where the switch is.

To make sure, we are talking about the fans on the radiator, correct. I jump the wire as you said on the switch and the a/c did come on, but the (radiator fan) did not. The a/c fan works.

The a/c doesn't seem to get as cold as it should unless I run a jumper from the (radiator) fan to the battery.

Lets do this i posted where your coolant temp sensor is there should be a yellow wire and a black wire going to it.I also posted a resistance chart for the sensor see if the resistance value matches with the actual coolant temp.Use a ohm's meter also while it's running jump the coolant temp sensor connector terminals together and see if the radiator fan come's on.Let me know what you find.

I went ahead and replaced the coolant temp sensor and it did not make the fan work. I did run a jumper on the connector to see if it made a difference. It did not, but I could hear a clicking sound on the firewall ( relays I assume) when I jumped the sensor connector terminals.

Alright now Lets do this i posted a trouble tree for you to follow.Let me know what you find.

Sorry forgot to post this earlier it goes with the above trouble tree.