Blower box sealer

[fleming442]

Ok I think I git it figured out. First of all I had been powering the harness with a battery charger since the car is in a state of disassembly for an ongoing motor swap (94 Z28 LT1 + 4l60E).

Anyway, the battery charger did not have enough voltage so the resistor would not let enough current through to spin the blower motor on low speed. Hooked up a real car battery and got it spinning in low, but still encountered intermittent action in all speeds except Hi.

Problem recognized > blower relay has a bad path on the through circuit (dk blue), the one that passes power through to the blower motor from the various resistor speeds. Checked that path with an ohmmeter (relay removed) and the reading is dancing all over the place. So, I have a new relay on order.

BTW, in studying the schematic and running tests I now have learned that the low speed is always on whenever the ignition key is in the run position, even when the head unit slide control in the off position. Am I correct in concluding that this is the way it's designed?

It is. Something about some "lovers lane" law and fresh air in the cabin so you don't asphyxiate. Some say there's a stop in the bezel that can be ground out to let the switch turn further off

 

[JD1964]

On the firewall to the left of the engine ground strap is a second thinner ground strap. It goes through the firewall at the junction between the blower box and firewall. Where does it go on the inside?

 

[JD1964]

Oh wait I see now, it’s a ground strap to the heater core to prevent corrosion from electrolysis

 

[69hurstolds]

It is. Something about some "lovers lane" law and fresh air in the cabin so you don't asphyxiate. Some say there's a stop in the bezel that can be ground out to let the switch turn further off

I thought it had something to do with A/C cars and keeping air moving through the system to keep it dryer to minimize mold/stench buildup. I've also heard it discussed to minimize the damage to the motors with too many stops/starts. But a lot of heater only cars had blowers that would turn off and the motors are easy to access, so not too sure about all that. Maybe that was older cars with heat only.

I guess I just don't care that much, but I've never heard of this "lovers lane" law thing.

 

[melloelky]

It is. Something about some "lovers lane" law and fresh air in the cabin so you don't asphyxiate. Some say there's a stop in the bezel that can be ground out to let the switch turn further off

wait,What? you're saying all this time she really wanted to "go home"? ..tramp..
🤣