Post by Charlie on May 24, 2020 15:45:30 GMT -5
Here's another thought... I think this would be the way to go if you were going to change out the evap... since everything has to come apart anyway...
Before doing the evap swap, acquire an A-body thermostatic switch... there are a few on the internet. If it's a genuine part from Big Mama Mopar, it would likely be far better quality than some made-in-China aftermarket part. And, it's probably set at the perfect operating range since it's designed for a Mopar. Study an A-body AC box to see how the sensor is installed and do the same for your B-body. I bet you would have a far better chance of a successful operation with an A-body switch than you would with any aftermarket "conversion" switch.
The cool thing (no pun intended) about using an evaporator thermostatic switch from an A-body is that it's adjustable... it's tied to the temp cable in the dash (read in that awesome tech manual on the previous page that Nacho provided). If I did it, I would run an independent cable from the switch to a spot under the dash... say for instance... in the area under the AC controls where your other optional switches reside (rear defog, air grabber, headlight washer). If you felt like your evap was still freezing up, you could pull out the cable just slightly to make the compressor cycle just a wee bit sooner. Probably wouldn't take too long to find the sweet-spot for your A/C.
Hell... this might even be worth trying even if you weren't changing the evap.
Before doing the evap swap, acquire an A-body thermostatic switch... there are a few on the internet. If it's a genuine part from Big Mama Mopar, it would likely be far better quality than some made-in-China aftermarket part. And, it's probably set at the perfect operating range since it's designed for a Mopar. Study an A-body AC box to see how the sensor is installed and do the same for your B-body. I bet you would have a far better chance of a successful operation with an A-body switch than you would with any aftermarket "conversion" switch.
The cool thing (no pun intended) about using an evaporator thermostatic switch from an A-body is that it's adjustable... it's tied to the temp cable in the dash (read in that awesome tech manual on the previous page that Nacho provided). If I did it, I would run an independent cable from the switch to a spot under the dash... say for instance... in the area under the AC controls where your other optional switches reside (rear defog, air grabber, headlight washer). If you felt like your evap was still freezing up, you could pull out the cable just slightly to make the compressor cycle just a wee bit sooner. Probably wouldn't take too long to find the sweet-spot for your A/C.
Hell... this might even be worth trying even if you weren't changing the evap.