I think i have a loose wire on fan blower switch. sometimes it blows sometimes it doesnt/

for the fan the motor resistor would be a possible cause, but the heat itself doesnt come up to temp? That wouldnt be a fan problem.

Right next to it is the resistor,remove connector,remove 2 screws and put new one in and call it the day.

REPLACE BLOWER MOTOR RESISTOR. IF YOU GET ONLY ONE CONTROL SPEED.IF YOU HAVE ALREADY REPLACE BLOWER MOTOR RESISTOR.BLOWER MOTOR CONTROL SWITCH BAD. REASON BLOWER STAY ON ALL THE TIME.FAN BLOWER MOTOR RELAY BAD.
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You need to look at the blower motor under the dash on the passenger side. Sound like it has a loose wire or bad connection.

there is a blower motor resistor that cuts the voltage for the different fan speeds. this is most likely the culprit. check autozone.com, you can get access to location and wiring diagrams to be more familiar with it. you have to register and it's free. the switch or wiring might also be bad, when in the high position, the switch effectively bypasses any resistor. although the voltage still runs through the assembley. a repair manual is you best option

Sounds like the blower resistor. It will either be located in the engine compartment outside the motor or inside the vehicle inside the blower motor cover. It could also as well be selector switch

change the blower resister module,if this doesnt work replace the control head

Ok, this is either a bad resistor switch or, a blown motor. you can test the blower motor by using a volt meter or multimeter as well. In most cases, this will be a bad resistor switch.

sounds to me like the blower motor resistor, and if I'm not mistaken the resistor and the blower motor are located under the dash on the passengers side. the resistor should have a wiring connection and 2 screws attaching it to the blower case. The a/c and heater blower will not work if the resistor goes out. hope this helps you out a little. Best wishes.

you don't need to change it .. you just have a loose wire
good-luck ray