JMT said he was going to swap in a heater core that was touted to deliver 150 degree air. I said I had no idea where that put things but I'd find out, so I ordered in a Robinair instant read HVAC thermometer to find out. These are the temps from one with known good Mopar stuff in it.
Ambient with the sun heating up the black dash bits. No AC or defrost running.
Very close to actual ambient.
I started it up and while waiting for the engine to get up to temp and open the thermostat, I turned on the AC just to see what it was doing.
It got up to temp, opened the thermostat and the heater started working. Center vents first.
And then the fun one. I was trying to hold the thermometer in the floor vent but it kept roasting my fingers. I had to go get a clamp to do it. When I saw the temp, I understood. Scalding is 150. 164 is toasty.
Oddly, the defrost is a bit less but I suspect that would go up as the ductwork warmed up, this was all cold when I started. I didn't leave it there long since the heat was driving me out of the rig even with the windows down. If it matters, I can do it again to see what happens when I don't mess with the AC first, but the floor vents tell the story.
Ambient with the sun heating up the black dash bits. No AC or defrost running.
Very close to actual ambient.
I started it up and while waiting for the engine to get up to temp and open the thermostat, I turned on the AC just to see what it was doing.
It got up to temp, opened the thermostat and the heater started working. Center vents first.
And then the fun one. I was trying to hold the thermometer in the floor vent but it kept roasting my fingers. I had to go get a clamp to do it. When I saw the temp, I understood. Scalding is 150. 164 is toasty.
Oddly, the defrost is a bit less but I suspect that would go up as the ductwork warmed up, this was all cold when I started. I didn't leave it there long since the heat was driving me out of the rig even with the windows down. If it matters, I can do it again to see what happens when I don't mess with the AC first, but the floor vents tell the story.