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A/C Issues? Anyone else

craiggemt said:
2020 2500 6.4L Laramie, no A/C issues.
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LOL @WI weather.

When I grew up there, we had two seasons. Winter and the 4th of July.

FWIW, I had the TSB performed on my Feb build 2020 and it's noticeably better. Still not as good as a Ford or GM system, but better than it was.
 
Lift89 said:
What is this? Please explain and point me in the direction lol.


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I added a shut off valve to the heater hose that feeds the heater core. Keeps the hot coolant out of the cab all together, works real good. I work on road tractors and heavy equipment, owner and operators do this all the time with diesel engines with no side effects just improves a/c cooling.
 
DammitDave said:
I added a shut off valve to the heater hose that feeds the heater core. Keeps the hot coolant out of the cab all together, works real good. I work on road tractors and heavy equipment, owner and operators do this all the time with diesel engines with no side effects just improves a/c cooling.
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Nice. I might have to give that a try next summer.


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DammitDave said:
I added a shut off valve to the heater hose that feeds the heater core. Keeps the hot coolant out of the cab all together, works real good. I work on road tractors and heavy equipment, owner and operators do this all the time with diesel engines with no side effects just improves a/c cooling.
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Also I was just reading that it could affect coolant flow/rerun from the turbo. And on the 6.7s they use coolant to also cool the turbo! So does this mod not effect turbo coolant flow?


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Lift89 said:
Also I was just reading that it could affect coolant flow/rerun from the turbo. And on the 6.7s they use coolant to also cool the turbo! So does this mod not effect turbo coolant flow?

No. Get a flashlight and trace out the lines if you need reassurance. I did this on my own truck AND on a 6.7 crate engine sitting in the service bay at my Dealer. As far as I can tell, cutting off the flow might actually INCREASE the flow of cooling to the turbo.
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Lift89 said:
Also I was just reading that it could affect coolant flow/rerun from the turbo. And on the 6.7s they use coolant to also cool the turbo! So does this mod not effect turbo coolant flow?


I actually did this mod 3 months ago and have not had any side affects.
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Update after receiving the probe thermometer. I have not been driving in any really hot temps since and now the time of year probably means the cabin temps will be OK until next summer. But here is what I have measured so far. Ambient outside temps around 80 degrees and all the dash vents blow air at 47 to 49 degrees when on lowest temp max A/C and various fan speeds. I suspect but have not confirmed that that those temps will be even higher when it is 100 degrees outside.

Another interreacting observation. When the A/C is off and not on recirculated air, the dash vents blow 12 to 15 degrees higher than outside ambient temps. So the air being taken in from outside is being heated 12 to 15 degrees before blowing out the dash vents.

This is all at highway speeds not idling.
 
Will_T said:
Update after receiving the probe thermometer. I have not been driving in any really hot temps since and now the time of year probably means the cabin temps will be OK until next summer. But here is what I have measured so far. Ambient outside temps around 80 degrees and all the dash vents blow air at 47 to 49 degrees when on lowest temp max A/C and various fan speeds. I suspect but have not confirmed that that those temps will be even higher when it is 100 degrees outside.

Another interreacting observation. When the A/C is off and not on recirculated air, the dash vents blow 12 to 15 degrees higher than outside ambient temps. So the air being taken in from outside is being heated 12 to 15 degrees before blowing out the dash vents.

This is all at highway speeds not idling.
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This is exactly what my Truck does. I run around 90% of the time on VENT. So, AC disabled, outside air and the fan running. My Truck heats the outside air even when it is set to the coldest setting and the panel vents. Complete bullCRAP. I absolutely 100% take it to the bank do NOT want hot air blowing in my face! I pinched the heater hose and never looked back. One thing I learned through all my testing : I KNOW my system is capable. I have seen 26 deg in one instance. But it is CONTROLLING to these hotter 53 deg vent temps. Two other interesting things. #1, my system runs in recirc even when in normal AC mode. So, basically I have no normal AC, it's always MAX. #2, even though the WIRE Diagram and SYSTEM DESCRIPTION show a cab tempature sensor, mine is missing. As in , NOT there. Even the dealer admitted they could not find it. There is a blank spot in my Dash where it attaches.

When it came down to it, I told my Dealer they could not take my dash apart to explore. They had to have a plan. Example: Find in cab temp sensor and do whatever it takes to implement it so it controls properly, execute the TSB (does not really apply to my Truck but it sure seems to apply to my truck??????).
 
I'm having TSB #24-001-20 done @ AutoNation - CJDR - Katy... 2 evaporator boxes, both broken in shipping. It's summer time in TX, not the time to have a weak sister AC system.
Love the truck other than that tho.
 
Me too and I still after the dealership fix. I also noticed the fan selector is odd. I have to turn it to high and when I turn it down a notch it seems to turn off. 2019 Laramie 2500
 
That's not something to look forward to... I took mine in 8 days ago, the TSB is basically 12 hours; they broke 2 evaporator housing / boxes in transit. This should have been a drop off on Monday, pick up on Tuesday evening; maybe Wednesday morning... This will be my 5th ram truck, after dealing with AutoNation's people; I'm starting to think this might be my last RAM.
 
I guess people are having really good luck by putting a coolant valve in-line that you can turn off so coolant doesn’t run through the heater core.

People are measuring a pretty good drop in ac temps. I think that are getting around 47-51 degree air coming from the vent when doing that mod.


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Lift89 said:
I guess people are having really good luck by putting a coolant valve in-line that you can turn off so coolant doesn’t run through the heater core.

People are measuring a pretty good drop in ac temps. I think that are getting around 47-51 degree air coming from the vent when doing that mod.


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Fun fact:

In the late 90's, from the factory GM installed a vacuum operated "heater control valve" in their trucks/suburbans/tahoes that would stop coolant from passing through the heater core in the cab of the truck any time the temperature on the panel was set to cold.

They did this for the exact problem we are talking about here.

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