Electrical problems

[Tony Dipatri]

The heater blower motor only has high speed and the other speeds do not work. When I turn the blower on, the truck either stalls or almost stalls....It was ok until I changed my injectors, map and Chip

Any Ideas


Thanks

 

[TYTILIDIE]

Re: Electrical problems

I would suggest checking your vacuum line that goes in to the cab by the distributor and make sure that it did not come unplugged. It goes in to a wire loom with some wires and then in to the firewall. It's right behind the FPR. If not that, try replacing the switch or even more likely, the blower motor relay.

 

[WyoSyclone]

Re: Electrical problems

Hey Tony,
If you've only got one blower speed it's most likely the blower motor resistor which is screwed into the side of the blower housing, in the engine compartment, passenger side. that's what gives you your blower speeds.
Check that harness, then remove the two screws that hold the resistor in place and remove it. Take a multimeter and check that you've got resistance through those leads. There should be three coiled wires in there - each coil provides a different resistance causing a change in motor speed.
If it had a dead short it could be causing the voltage at the ecm to sag enough to cause the motor to die.

 

[TYTILIDIE]

Re: Electrical problems

Hey Tony,
If you've only got one blower speed it's most likely the blower motor resistor which is screwed into the side of the blower housing, in the engine compartment, passenger side. that's what gives you your blower speeds.
Check that harness, then remove the two screws that hold the resistor in place and remove it. Take a multimeter and check that you've got resistance through those leads. There should be three coiled wires in there - each coil provides a different resistance causing a change in motor speed.
If it had a dead short it could be causing the voltage at the ecm to sag enough to cause the motor to die.

Good thought. If this is the case you wont need a multimeter. All you have to do is pull it out and you will see where the coils have broken.

 

[crazykaese]

Re: Electrical problems

If your blower motor is going bad it will burn up components - even melt the blower speed selector switch in the dash. Pull the blower motor and test it - make sure it spins freely.

 

[Tony Dipatri]

Re: Electrical problems

Thanks for the responses...heres what I did so far...I changed the resistor under the hood and I replaced the vacuum lines with the silicon kit from sportmachines. I do have the new fan selector switch I have to install. I will update when that is complete....

thanks

 

[Tony Dipatri]

Re: Electrical problems

Hey Tony,
If you've only got one blower speed it's most likely the blower motor resistor which is screwed into the side of the blower housing, in the engine compartment, passenger side. that's what gives you your blower speeds.
Check that harness, then remove the two screws that hold the resistor in place and remove it. Take a multimeter and check that you've got resistance through those leads. There should be three coiled wires in there - each coil provides a different resistance causing a change in motor speed.
If it had a dead short it could be causing the voltage at the ecm to sag enough to cause the motor to die.

I will check this Rob,

Thanks

 

[SY-1193]

Re: Electrical problems

The heater blower motor only has high speed and the other speeds do not work. When I turn the blower on, the truck either stalls or almost stalls....It was ok until I changed my injectors, map and Chip

Any Ideas


Thanks

If your blower motor is going bad it will burn up components - even melt the blower speed selector switch in the dash. Pull the blower motor and test it - make sure it spins freely.

Tony,
Listen to Dennis...he had the same exact symptoms.
Fan worked in HIGH ONLY.
He replaced the Fan Control, the resistors multiple times and the problem still persisted. ...Even melted the new fan control. Turned out the fan motor was bad even though it worked in high. The replacement fan motor (approx. $35.) fixed the problem. I beleive there was two choices for the motor. w/AC and wo/AC. so get the right one. Still check the other items others suggested but I believe the motor to be your problem.

 

[Tony Dipatri]

Re: Electrical problems

Tony,
Listen to Dennis...he had the same exact symptoms.
Fan worked in HIGH ONLY.
He replaced the Fan Control, the resistors multiple times and the problem still persisted. ...Even melted the new fan control. Turned out the fan motor was bad even though it worked in high. The replacement fan motor (approx. $35.) fixed the problem. I beleive there was two choices for the motor. w/AC and wo/AC. so get the right one. Still check the other items others suggested but I believe the motor to be your problem.

Ok I will change the switch first since I already bought one...Then I will tackle the Blower motor.


Thanks

Tony