Got the the Cambridge's heater blower motor upgraded to something new and 12v capable.

After this morning's trip back from the grocery store it moved to the front of the line.

I wrote it up on my webpage.

Relatively speaking it was fairly painless.

But, and we all knew this was coming, the snowball rolleth.

I may have mentioned that the heater controls were somewhat of a mystery to me. So I spent some quality time with them to figure out what did what.

Left knob is temperature, simple enough and last weekend I sorted that out and lubed that control cable. You pull the knob, it opens a water valve on the head and hot coolant flows thru the heater core.

Next knob to the right is the fan speed. This is the only electrical part of the controls and it has three positions, all the way in is off, one notch out is low speed, second notch out is high speed.

Third knob to the right is air off. I had no idea what it did, trying to pull it didn't do anything, turning it unscrewed the knob.

Last knob was defrost, it is a control cable that pulled out some to give me air on the base of the windshield, not much air but a bit.

I decided to work out how this was supposed to function. I pulled the radio delete plate, pulled the glove box and I ended up pulling the air plenum. Disconnect the defrost duct and two nuts on the engine side of the firewall out she comes.

Two control cables are attached to the plenum, the defrost cable and the air off cable. The air off cable was all bound up. I disconnected it from the plenum end and worked some cable lube into it from both ends and straightened out a kink. This freed it up and I was able to reinstall it so that it now properly controls the flap on the input to the plenum and doesn't bind. This shuts off any airflow into the plenum from the engine side of the the setup.

Next I got to work on the defrost control cable, it sort of functioned initially and all it really needed was lubrication. This cable controls the flap that directs air from the floor to the defrost duct. It is located right behind the air off flap. I also lubed up all the pivot points on the flaps.

The lube I used is specifically designed to go on with a fast evaporating carrier and lubricate dry without attracting dirt or dust.

I now have a very good understanding of what and how my heater system functions. Sorry, no web writeup for this as my phone was down to 8% and got put on the charger.

Not too shabby a day considering I did my grocery shopping and had to spend 2+ hours with the cable company getting rid of them. Seems you can turn in the equipment at the local office, which took 50 minutes of standing around till I got to the counter. But they can't terminate the contract, I had to call a number to do that. The "retention team". Lol, he got an earful. No cable means more time and money for the Plymouth.