Hvac Blower .. Blowing Fuses

Taaaaaaahoe? · November 26, 2009

My HVAC system is not working properly, Seems to work fine on speeds 1 or 2,... but if I move it to a high speed it blows that 10 amp fuse found on the side of the Dash, and then NO blower works.

I replace the fuse, it works for a few minutes then blows it again.

Thoughts? I have replaced that blowe motor resistor a few months ago when I lost fan speeds before - but it never blew fuses.

I have no idea where to begin.

NOT the automatic HVAC style.

gmtech4 · November 26, 2009

the motor maybe?

Taaaaaaahoe? · November 26, 2009

Motor has no noises. Is there a way to TEST the motor? Its weird that it still works.. for periods of time.. no?

rodram · November 27, 2009

... you have to suspect that either the blower motor or the switch is shorting out somewhere ... and yes the blower motor can die or short out without making any noises ... more likely the blower motor

bossier62guy · November 27, 2009

My HVAC system is not working properly, Seems to work fine on speeds 1 or 2,... but if I move it to a high speed it blows that 10 amp fuse found on the side of the Dash, and then NO blower works.

I replace the fuse, it works for a few minutes then blows it again.

Thoughts? I have replaced that blowe motor resistor a few months ago when I lost fan speeds before - but it never blew fuses.

I have no idea where to begin.

NOT the automatic HVAC style.

Did you replace the resistor connector too or just the resistor itself? The blower motor has one power input. The resistor determines how much voltage is sent to the motor thus determining the speed of the motor. If the motor is working just fine on speeds 1 and 2 odds are the motor is not the problem. I'd look for melted wires near the resistor first and pull the resistor out and check it as well.

Taaaaaaahoe? · November 28, 2009

I replaced the resistor, and the pigtail that plugs into the truck about 4" long.

I also don't feel the motor is the issue (But Im not sure .. so I turn to you ..the experts )

But if it was the motor don't you think the 40a fuse for the blower would be the one blowing..

The fuse blowing is the HVAC 10 amp found in the dash area. (I am told this controls only the HVAC Control panel)

Thanks for the input guys!

salden77 · November 28, 2009

I replaced the resistor, and the pigtail that plugs into the truck about 4" long.

I also don't feel the motor is the issue (But Im not sure .. so I turn to you ..the experts )

But if it was the motor don't you think the 40a fuse for the blower would be the one blowing..

The fuse blowing is the HVAC 10 amp found in the dash area. (I am told this controls only the HVAC Control panel)

Thanks for the input guys!

my 06 had a similar problem, replaced the blower motor resistor and replaced connector and it works fine now.

bossier62guy · November 28, 2009

I replaced the resistor, and the pigtail that plugs into the truck about 4" long.

I also don't feel the motor is the issue (But Im not sure .. so I turn to you ..the experts )

But if it was the motor don't you think the 40a fuse for the blower would be the one blowing..

The fuse blowing is the HVAC 10 amp found in the dash area. (I am told this controls only the HVAC Control panel)

Thanks for the input guys!

Did you inspect the resistor and the connector as I suggested a few post ago? If so what were the results? If not that would be my next move....

minibike132 · November 28, 2009

I replaced the resistor, and the pigtail that plugs into the truck about 4" long.

I also don't feel the motor is the issue (But Im not sure .. so I turn to you ..the experts )

But if it was the motor don't you think the 40a fuse for the blower would be the one blowing..

The fuse blowing is the HVAC 10 amp found in the dash area. (I am told this controls only the HVAC Control panel)

Thanks for the input guys!

Off the top of my head I can't think of a tahoe that blew that fuse when putting it into high so I can't really explain why that happens without putting my hands and some meters on it. If the blower were the issue you should be blowing the 30 or the 40 amp fuse.

The 10 amp HVAC1 fuse in the left panel goes to the control head but also splits off from the back of the fuse panel and over to the right side panel (same location as the left panel but on the right). From there power is distributed to the actuators. Given your previous complaint for an actuator this wouldn't be a bad place to start. That area is a common place to find some water dammage and also has common terminal tension issues.