2019 2500 6.4 AC not very cold

[McBroom]

I have a 2019 RAM 1500 Limited and I am, also, very disappointed with the air temperature I am getting out of my vents. I saw a video on YouTube where a guy put an $8 clamp from Harbor Freight on his heater hose. He saw a temperature drop of about 10 degrees with it in place. I thought that was worth a try, so I did the same thing. Wow what a difference. My temperature on the driver side used to be 51-52 degrees at best. Passenger side was 45 degrees. Now I get 43 degrees on both sides and the AC feels great. I did this just to diagnoses it. I found out Ram does not use a heater control valve any more because they claim the heater core contributes to the cooling of the engine under heavy loads or really hot days. The heat from the heater core is infiltrating the cooling system making the AC less effective. Well, I called Ram and asked them how they were going to fix this bad design. They said it is normal, live with it.

Do you have a link to that video?


The Blue Mule

 

[crash68]

I found out Ram does not use a heater control valve any more because they claim the heater core contributes to the cooling of the engine under heavy loads or really hot days. The heat from the heater core is infiltrating the cooling system making the AC less effective. Well, I called Ram and asked them how they were going to fix this bad design. They said it is normal, live with it.

Sounds like the three way valve is defective but only now it's not throwing codes. It's a three-way that directs the coolant through the transmission TMU if heat is not needed in the cab. It will also direct coolant to the heater core if the truck starts to overheat(the AC is also shut down).

 

[turkeybird56]

Sounds like the three way valve is defective but only now it's not throwing codes. It's a three-way that directs the coolant through the transmission TMU if heat is not needed in the cab. It will also direct coolant to the heater core if the truck starts to overheat(the AC is also shut down).

Crash: I think they changed the way the valve works and the electronic controls of it at the expense of their owners of the vehicles...

 

[turkeybird56]

CRASH HERE IS THE LINK:

https://www.ramforum.com/threads/diy-heater-core-bypass.187/#post-1518

 

[Robert A Knight]

the 2019's in the 2500's are using the 134a
just to give yall an up date on my truck......
its still in the dealership, this is the 9th day its been in the shop, they still cant figured it out.
The last report i got Friday, was they checking on the damper out at the condenser.
to me thats ********* , that dont have anything to do with the evaporator temp being freezing cold.
I agree with some of yall that the hot water coil is mixing with the cold air.
The dealership said they done checked that and it was fine.
I told the dealership Saturday that either they can get the truck fixed or get me another truck.

 

[Robert A Knight]

Hi Robert A Knight,

I’m very sorry to hear of the trouble you are experiencing with your truck. If it would be of interest, I would be happy to have this documented and escalate a case on your behalf so that we can connect you with a case specialist who will be able to work alongside your dealer to find a potential solution. Please follow up with us via PM to proceed in this manner.

Mark
Ram Social Care Specialist

yes mark that would be great
My truck is on day 9 in the shop and they still dont know whats going on with it

 

[lharrell79]

Bases on HVAC issues, and the "AC hack" with a clamp on the heater hose. I think it's same to say there is heat bleeding into the cabin. Which would mean the blend door isn't closing all the way, or something else??? Robert, ask the dealer if they've tried calibrating the blend door actuator. I'm wondering if the actuator isn't calibrated properly from the factory, and the blend door is staying slightly open. Or, maybe there is a physical design flaw, that is keeping the blend door from shutting all the way.

 

[Horsepuller]

Just got a 2019 2500 with the 6.7 last week. I agree. The A/C is kind of weak. My '18 Toyota Rav4 turns the inside to a meat locker. The Ram, not so much.

 

[RamCares]

yes mark that would be great
My truck is on day 9 in the shop and they still dont know whats going on with it

Hi Robert A Knight,

Thank you for following up with me to confirm! Please know that I have sent you a PM regarding this matter. Kindly review my message and follow up with me there when you can.

Mark
Ram Social Care Specialist

 

[Robert A Knight]

OK for the ones thats having the same issues that i was having,,,
this is what the dealership has done ,
Inspected all actuators, checked all calibrations , all was to specs.
The R134a refrigerant for this 2019 { 2500 } , the factory charge is 1.31 lbs,
they were told to add freon, now the freon charge is 1.55 lbs, and at this charge the evaporator
temp was 38 degrees with the out door temp at 100 degrees
at the outlet of the supply grilles on the dash, was reading 46 degrees
They said the factory needs to change the specs on the charge

Just thought i would let yall know
Robert

 

[RainDesert]

Thanks for the report, so I assume you are happy with the performance at 1.55 lbs?

 

[friedb]

I have the same poor cooling issue on my 2019 2500 6.4 . I had it checked 2 weeks after it was purchased and was told its was in spec. I just took the truck in for warm air from vents when system is set on cold vent . 2nd trip to dealer , and they kept it 4 days to tell me this is normal for these trucks .

 

[lharrell79]

It is starting to become evident, that there is a major flaw with the HVAC system, in the 5th gen rams. Many owners complain of poor AC, heat blowing when set to cold, defrost only works on one side, etc. Initially, dealerships and engineers were attempting to diagnose/fix the issues. As of lately, the standard answer is, "Your truck's HVAC is within specs."

I think FCA knows there is a massive design flaw, and they realize the fix would be too costly. Therefore, they're choosing to ignore the issue. Sad!

 

[RainDesert]

I have the same poor cooling issue on my 2019 2500 6.4 . I had it checked 2 weeks after it was purchased and was told its was in spec. I just took the truck in for warm air from vents when system is set on cold vent . 2nd trip to dealer , and they kept it 4 days to tell me this is normal for these trucks .

Same with my truck.
I finally had time to get mine in the for the 2nd time, the dealer added some refrigerent and said I was good to go. Well now it's winter time here so I can't tell if it will actually blow colder when needed. The one thing that has not changed is the consistent warm air coming in through the vents when on cold setting.

 

[dexter]

Anyone else with this issue? I haven't had any time to leave the truck at the dealer. The dealer said they have not had an issue come in yet. I've had many new trucks over the last 10 years, this one is not even close to cold compared to the other Ram/Ford trucks I have had.

Climate change...

 

[Michaelwnagle]

What did you find out,
Just got my Ram 2500 3 weeks now went a trip to Orlando and the AC would only blow cool on max. When the temperature is set to anything less than max it blows hot air. I have an appointment tomorrow at the dealer

 

[Michaelwnagle]

Anyone else with this issue? I haven't had any time to leave the truck at the dealer. The dealer said they have not had an issue come in yet. I've had many new trucks over the last 10 years, this one is not even close to cold compared to the other Ram/Ford trucks I have had.

Just got my Ram 2500 3 weeks now went a trip to Orlando and the AC would only blow cool on max. When the temperature is set to anything less than max it blows hot air.

 

[RamCares]

What did you find out,
Just got my Ram 2500 3 weeks now went a trip to Orlando and the AC would only blow cool on max. When the temperature is set to anything less than max it blows hot air. I have an appointment tomorrow at the dealer

Hi Michaelwnagle,

Sorry to hear that you are experiencing this concern with your truck. Please be sure to keep us updated on your dealer's findings. If our team can be of any extra support as you address this with your dealer, please do not hesitate to send us a private message.

Mark
RamCares

 

[McBroom]

It's the new freon. It really sucks

Blue Mule

 

[Michaelwnagle]

Hi Michaelwnagle,

Sorry to hear that you are experiencing this concern with your truck. Please be sure to keep us updated on your dealer's findings. If our team can be of any extra support as you address this with your dealer, please do not hesitate to send us a private message.

Mark
RamCares

Well got it fixed today, looks like they don’t know how to program the units at the factory. It works perfect now good and cold, Ram needs to get there quality control program together