Heater/AC fan won't operate

i dont know how accurate your gauge is, but a lot of gm cars that i have scanned to check fan operation didnt kick the fan on till about 220 degrees. it seems yours is probly working fine. the thermostat isnt fully open till about 200 degrees if its a 195

Faulty heater blend door or faulty heater blend door motor.

you have a piece of solder broken off the controller of your hvac unit, causing power not to get to the blower motor it self. take test light and see if you have power at the blower motor. check and see if you have continuty or brake between the power wire at the blower motor and at the hvac control unit. if wires are good then the problem will lie in the hvac control unit. check and see if the blower is working at all speeds, if it works on some speeds thens the blower motor resistor.

does it go off when you turn the key off if not it is the blower module under the hood on the firewall

It is out under the hood ,mounts in the heater case it has 4 wires going to it if your car has manual air and 4 wires coming out if is automatic control air.

COOLING FAN IS CONTROLLED BY COOLANT TEMPERATURE SENSOR (CTS). REMOVE THE CONNECTOR FROM IT AND IT SHOULD STOP THE FAN.
OR JUST REMOVE BATTERYGROUND CABLE.
ITEMS TO CHECK OUT :

CTS,RELAY,CIRCUIT FOR SHORTS.
NOT LIKELY BUT IS A POSSIBILITY, THR ECU.

check the heater motor hot lead as well as the ground wire on the heater motor they have common ground fault issues that result in bad / weak connections also check the fam motor speed control resistor located under the hood in the AC/heater box

the ac computer is on the fritz or the ac control panel has a short in it

find wires to fan motor,get jumper wires go directly from battery to fan,make sure you have positive and negative right,see if fan works if not fan motor is bad and needs replaced,thats were i would start!! Hope this helps!!!

should be seven mil. screws pass. bottom take plastic panels off