I've had to run a fused link from the battery to the blower relay, and this worked fine but now it keeps blowing fuses. It will run normally then cut out for awhile. I'm assuming it's over heating. It will do this a few times until the fuse blows. I have a 10 gauge wire and a 30 amp fuse. Is my motor going? Is it the selector switch? Need help testing but dont know where to start or what specs to use.

 

What year is the truck? Why did you need to run a new wire?

George

 

2000. 2dr. 4x4 LS

 

Blower? For the heater?

Could it be that it is wearing out and drawing more and more current to overcome friction in it?

 

That's my guess. It will switch on and off, over and over until the fuse blows. I'm going to replace the blower. If the problem persists, I'm guessing ground.

 

When you replace it, be sure to take the opportunity to clean out any debris that has accumulated inside the the compartment and inlet to the AC evaporator.

Also, be careful with cutting out the cover for the blower. There is a drain hose for the motor body that you will want to keep. (you can see it in my picture below) The replacement one that came with my blower motor did not fit.

Then when you replace the plastic cover, be sure to use a sealant (RTV or whatever) that does not give off corrosive fumes. This can damage anything electronic. I'm thinking most RTV products now are electronics safe but just be sure to check.

I have the Computer Climate Control and as such there is an solid-state sensor you can remove to gain even more access to the area at the inlet to the evaporator. I found LOTS of little leaves and larch needles in there. It attaches to the right of the blower motor when looking from the front of the truck. Its opening is the one with all of the leaves and needles in the picutre.

If you don't have the Computer Climate Control, this sensor is replaced by a resistor network that is mounted to the top of the compartment on the exit side of the evaporator.


The green lines are where the evaporator is.


Some of the needles and leaves I pulled out by hand. Much more was in my shop vac!

 

Replaced blower. Much better, BUT, it still cuts out. Not nearly as much. Only twice. But still cuts out. I'm at a loss. Maybe a ground.

 

How did you route the new fused wire and why?

George

 

Straight from the battery to the blower under the fender best I could.

If I remember correctly, I was similar issues with the original fused line. I remember a melted relay. I'll have to go back and look. I posted it on here and received help.

 

I would get a voltmeter across the terminals of the motor at full speed to see the net motor voltage. Then motor positive to frame ground also under full load. If you have a ammeter then current at full load also.

George