HVAC temps in a good working TJ with a good HVAC system

If I were post up some numbers from my OSC heater core how critical would it be that I use the same Robinair thermostat used in previous posts?
I can order one but I do have an instant read meat thermometer, not sure how accurate it is but might give a good enough idea?
 
JMT said:
@P man

Granted my evidence is anecdotal, but don't get the AGILITY heater core I got through Rock Auto. It's not even worth checking the temps. It's obviously not even as warm as body temperature. Piece of crap now inside my HEVAC. I'll have to go back in before next winter or move to southern California.
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UPDATE: I meant to do this earlier. I found a plug unplugged. Plugged it in and now the Agility works well. I’ve yet to order the Robinair to test the heat levels, but I’ll get to it. I’m happy with the heat now. It warms up fast and keeps me plenty warm. Longevity unknown.
 
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James9100 said:
If I were post up some numbers from my OSC heater core how critical would it be that I use the same Robinair thermostat used in previous posts?
I can order one but I do have an instant read meat thermometer, not sure how accurate it is but might give a good enough idea?
Click to expand...

I don't know if it's just me but lately I have trouble trusting anything to tell me what I want to know. Temperatures, torques, you name it, who knows if it was properly calibrated and wasn't dropped from the top shelf while in storage?

And I don't know about Brass Works but I do appreciate them telling everyone how to stay safe wherever they live, including California:

"In short, do not eat metal. For more information, visit www.P65Warnings.ca.gov/product"
 
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JEEPCJTJ said:
I don't know if it's just me but lately I have trouble trusting anything to tell me what I want to know. Temperatures, torques, you name it, who knows if it was properly calibrated and wasn't dropped from the top shelf while in storage?

And I don't know about Brass Works but I do appreciate them telling everyone how to stay safe wherever they live, including California:

"In short, do not eat metal. For more information, visit www.P65Warnings.ca.gov/product"
Click to expand...

Oh c’mon, people are looking out for your best interests! 🤣
 
I replaced my heater core last Thanksgiving and got the AC charged up last week. I should test out my TJ and see the temps for it.
 
JMT said:
UPDATE: I meant to do this earlier. I found a plug unplugged. Plugged it in and now the Agility works well. I’ve yet to order the Robinair to test the heat levels, but I’ll get to it. I’m happy with the heat now. It warms up fast and keeps me plenty warm. Longevity unknown.
Click to expand...

Thanks for the update!

Probably will go Agility with the knowledge that any replacement heater core probably won’t last as long as the OEM Mopar.
 
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James9100 said:
If I were post up some numbers from my OSC heater core how critical would it be that I use the same Robinair thermostat used in previous posts?
I can order one but I do have an instant read meat thermometer, not sure how accurate it is but might give a good enough idea?
Click to expand...

I don't know that it matters. I only picked that one due to be knowing who Robinair is, how long they have been doing HVAC stuff, and my lack of experience with anything else.
 
JMT said:
UPDATE: I meant to do this earlier. I found a plug unplugged. Plugged it in and now the Agility works well. I’ve yet to order the Robinair to test the heat levels, but I’ll get to it. I’m happy with the heat now. It warms up fast and keeps me plenty warm. Longevity unknown.
Click to expand...

That's good news. If you like I can send you my Robinair to do some testing and you can send it back later, just let me know. I would be very curious to see the results from your Agility core.
 
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JMT said:
UPDATE: I meant to do this earlier. I found a plug unplugged. Plugged it in and now the Agility works well. I’ve yet to order the Robinair to test the heat levels, but I’ll get to it. I’m happy with the heat now. It warms up fast and keeps me plenty warm. Longevity unknown.
Click to expand...

I'm curious about what was unplugged.
 
mrblaine said:
I don't know that it matters. I only picked that one due to be knowing who Robinair is, how long they have been doing HVAC stuff, and my lack of experience with anything else.
Click to expand...

williambmac said:
I have a Robinair and a meat thermometer. They both read about the same.
Click to expand...

Okay cool, I’m gonna get some reading for the output from my OSC and post em up (y)
 
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psrivats said:
That's good news. If you like I can send you my Robinair to do some testing and you can send it back later, just let me know. I would be very curious to see the results from your Agility core.
Click to expand...

Thanks so much for the offer Sri. Im ordering one tonight. We’re on vacation in Whitefish enjoying a few last days on the slopes. The results will be interesting. I don’t expect the Agility to perform as well as Mopar (the French unit), but it is fully acceptable to me IRL experience.

Looking at the slopes
IMG_3165.jpeg


Looking from the slopes
IMG_3163.jpeg
 
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dbbd1 said:
I'm curious about what was unplugged.
Click to expand...
Blend door actuator. I swapped out the whole dash harness, and in the process I also swapped out the evap and heater core. I forgot to plug it back in. The good thing is it’s easy to plug back in from the passenger floorboard looking up on the bottom of the HEVAC.
 
JMT said:
Thanks so much for the offer Sri. Im ordering one tonight. We’re on vacation in Whitefish enjoying a few last days on the slopes. The results will be interesting. I don’t expect the Agility to perform as well as Mopar (the French unit), but it is fully acceptable to me IRL experience.

Looking at the slopes
View attachment 512333

Looking from the slopes
View attachment 512331
Click to expand...

Very pretty .. enjoy your vacation! Whitefish is in my bucketlist of places to visit someday.
 
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My results so far. System was already heated up. I used a meat thermometer. If someone wants me to get a Robinair I can do that. I’ll do the other vents later. As you may know I have a broken part in the HEVAC that won’t allow me to change from defrost vents to dash to floor, though it changes randomly. Today the dash vents were blowing 133.6*F at ambient temp of ~48*F at my home.

IMG_3194.jpeg

I don’t fully know the relationship that would enable me to meaningfully compare @mrblaine 157*F at ~ambient temps of 69*F, but his ambient temp is ~21*F warmer than mine, and his temps are 23-24*F warmer than mine.
 
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mrblaine said:
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.
View attachment 500046
Very close to actual ambient.

View attachment 500048

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.

View attachment 500050

It got up to temp, opened the thermostat and the heater started working. Center vents first.
View attachment 500051

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.

View attachment 500052

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.
View attachment 500053
Click to expand...
You can calibrate the thermometer, turn the dial hold the probe.
 
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