I replaced the fuse and it blows again as soon as I turn on the A/C. Any suggestions to find the short? what components are on this circuit. History: the car was overheating, solved that problem, but what appears to be a result of the overheating is that this fuse continues to blow and the A/C blower is not operating. there were no issues w/ electrical before the car overheated
By A/C blower you mean the A/C fan by the radiator? it is possible that the fan motor has failed therefore requiring more amperage to try to turn it and as a result it blows the fuse. Disconnect the fan and install good fuse and turn A/C on if the fuse does not blow replace the fan.
My neighbor and I looked at it and came to the same conclusion. I just replaced the blower motor this morning. stuck the fuse back in and the fan fired right up... interesting thing is that the key was not in the ignition. turned on and off the car, adjusted the dial and it just kept blowing at full. The old fan was pretty tough to turn so i'm pretty sure that the old fan was shot, but what could be causing the new issue? blower motor resistor?
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SOURCE: Fuse keeps blowing on 2004 Jeep Grand Cherokee
Your fan seems to be drawing way too much current, common with fan motors of all kinds when they are going bad. It will still blow, but hot wires and blown fuses in the normal circuit indicate you have an excessive load in the circuit. Fan motors create this condition regularly, but are often ignored since they are "still blowing."
Here's a cheap, easy way to test my theory:
Try a new fuse, the proper amperage, but leave the blower motor unplugged at the blower itself. That will tell you in a few rides if the blower was the culprit. (Which it most likely is.) I bet your #20 fuse will stop blowing and no more smoking pink wires! Hope this helps. Remember, blower motors are cheap, traffic tickets and dash fires are not. The blower motor draw is the logical thing wrong with this picture. Good LUCK! TT
SOURCE: Overheating 97 V6 pontiac grand am
1
Inspect
Cooling System Mix
Coolant level low or flow is restricted.
2
Inspect
Belt
Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s).
3
Inspect
Oil Pan Gasket - Performance
Ruptured, cracked or leaking radiator hose.
4
Inspect
Radiator Cap
Worn or damaged radiator cap
5
Inspect
Thermostat
Thermostat stuck closed
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Inspect
Fan Blade
Broken, missing, or defective fan blade(s).
8
Inspect
Water Pump
Damaged, worn or leaking water pump.
9
Inspect
Intake Manifold Plenum - Perform
Leaking water pump gasket.
10
Inspect
Cooling Fan Control
Faulty cooling fan control or circuit.
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Inspect
Cooling Fan Switch - Radiator
Faulty radiator cooling fan switch or circuit.
12
Inspect
Engine Temperature Sensor
Faulty engine temperature sensor or circuit.
13
Inspect
Temperature Switch
Damaged or faulty temperature switch or temperature switch circuit.
14
Inspect
Fan Clutch
Worn, loose or faulty fan clutch.
15
Inspect
Ported Vacuum Switch
Damaged, leaking, or faulty ported vacuum switch.
16
Inspect
Radiator
Obstructed radiator core or radiator cooling fins.
17
Inspect
Head Gasket - Performance
Head gasket leaking coolant into cylinders
SOURCE: Overheating and heater not work
there is a valve on the water pump and one on the thermostat housing open those up one at a time until you get a little bit of antifreeze come out then tighten them back up. All you will be doing is bleeding the air out of the cooling system. my car was doing the same thing after I changed my thermostat.
SOURCE: No parking lights, fuse keeps blowing.
There is a ground not connected or a wire open that is causing it to blow
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You mentioned that the car was overheating. Is the cooling fan working? Replace the fuse and disconnect power to the fan then turn A/C on. See if the fuse blows.
Not the blower motor inside the car but the cooling fan behind the radiator.
The cooling fan is working fine. The overheating was caused by low coolant and solved with a new radiator cap. I pressure tested the system to make sure I didn't have another leak somewhere and the car has been working fine for about 3 weeks. Only remaining problem is the blower motor. Replaced it and the fuse holds, problem now is that the motor has continuous power even with the car off.
new blower motor resistor this morning (not an easy part to get to), problem solved.
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