Auto Climate Control Fan Speed - Not accounting for engine temp

[riccnick]

There's a difference between cold air, and comfortable air. It's an important one. For those of you who are sitting in the truck and remote starting it, what still feels like cold air will be "warm" enough to make a difference when defrosting the windshield and warming up the cabin without occupants. As soon as the engine starts, there is temperature change happening in the heating circuit that the blower motor moves air past. It may not be warm enough to feel comfortable when sitting in front of the vents, but it's warm enough to use for cabin warming.

Coolant temp should only need to be around 100° for the fans to start moving "comfortable" air throughout the cabin AFTER the remote start takeover happens and the truck thinks occupants are inside. Before that, any coolant temp higher than ambient temp will work. And just moving the cold air around in the truck is enough to de-fog the windshield and glass, regardless of temp.

 

[Rich]

Not when you need to de-ice a windshield.

It needs to warm the glass.

And when auto-starting, the defrost function shuts off and the air is diverted from the windshield to the floor before any warmer air starts to flow at all.

 

[speedracernc]

Yes I know this is an old thread. Has there been a fix for this yet? Mine is blowing cold air but I don't remember it doing that last winter.

 

[hunter1234]

I'll double check today but I know on remote start the fan is on full and then comes down when I get in and push the start button, I do not believe the fan is on full with a regular start as I have noticed it kicks up when the coolant temp get above about 110 degrees. I have 2020 Laramie purchased in July of 2020, I leave the climate control on auto.

 

[ScottsRAM]

2019 limited. When I start the truck (not remote), the fan blower goes straight to high in the auto mode. When it's 20 degrees outside, its very annoying to have to shut it off until the engine warms up, then put it back into auto. Dealer checked it and has no idea what to do, so they called Ram and started a "star" case. After several days in the shop, Ram nor the dealership have a clue on how to fix it. My dad just got his 2021 limited (exactly like mine) and his works perfectly. Take the programing for the '21 and flash mine to it. Its in the programing.

 

[speedracernc]

2019 limited. When I start the truck (not remote), the fan blower goes straight to high in the auto mode. When it's 20 degrees outside, its very annoying to have to shut it off until the engine warms up, then put it back into auto. Dealer checked it and has no idea what to do, so they called Ram and started a "star" case. After several days in the shop, Ram nor the dealership have a clue on how to fix it. My dad just got his 2021 limited (exactly like mine) and his works perfectly. Take the programing for the '21 and flash mine to it. Its in the programing.

Strange thing for me is last winter mine was fine and didn't do this. Now this winter it is. Something went wrong with the last update? Surprised more people are not having this problem. I am thinking of disconnecting battery and seeing if that resets things.

 

[ScottsRAM]

Strange thing for me is last winter mine was fine and didn't do this. Now this winter it is. Something went wrong with the last update? Surprised more people are not having this problem. I am thinking of disconnecting battery and seeing if that resets things.

As far as I know, I've not had any updates. Are you experiencing the vibration (58-64mph) also?

 

[speedracernc]

As far as I know, I've not had any updates. Are you experiencing the vibration (58-64mph) also?

I don't have any vibration. The only complaints I have with this truck are:
Heater blowing full blast
Grinding of the steering wheel when turning right
Rear passenger sounds weird when closing

Other than those I couldn't be happier with it.

 

[ScottsRAM]

I don't have any vibration. The only complaints I have with this truck are:
Heater blowing full blast
Grinding of the steering wheel when turning right
Rear passenger sounds weird when closing

Other than those I couldn't be happier with it.

I have the same problem with the rear drivers side door. When its cold out, the "auto" climate control turns the fans on high at start up. Dealer doesnt know how to fix it, nor does Ram. "They haven't heard of this problem". Ya, right.

 

[speedracernc]

I have the same problem with the rear drivers side door. When its cold out, the "auto" climate control turns the fans on high at start up. Dealer doesnt know how to fix it, nor does Ram. "They haven't heard of this problem". Ya, right.

come to think of it... its the rear driver door that sounds weird. wonder what it is.

 

[ScottsRAM]

come to think of it... its the rear driver door that sounds weird. wonder what it is.

I had the dealership adjust the door, but I don't think it did any good. The door didn't fit flush at the bottom and still sticks out a little. The door closing almost sound hollow to me - at least not like the others.

 

[speedracernc]

I had the dealership adjust the door, but I don't think it did any good. The door didn't fit flush at the bottom and still sticks out a little. The door closing almost sound hollow to me - at least not like the others.

mine is exactly the same

 

[RamCares]

2019 limited. When I start the truck (not remote), the fan blower goes straight to high in the auto mode. When it's 20 degrees outside, its very annoying to have to shut it off until the engine warms up, then put it back into auto. Dealer checked it and has no idea what to do, so they called Ram and started a "star" case. After several days in the shop, Ram nor the dealership have a clue on how to fix it. My dad just got his 2021 limited (exactly like mine) and his works perfectly. Take the programing for the '21 and flash mine to it. Its in the programing.

Hi Scott, we are sorry to hear about the trouble you are facing while addressing this concern with your dealer! Please follow up in a private message with your VIN so that we may look into this further for you. We would be more than willing to escalate this concern to a specialist for additional support if needed.

Kathryn
Ram Cares

 

[djjr50]

It's finally been cold enough for me to notice but I also have this 'change'. I distinctively remember the HVAC not starting until the engine was up to temp. Now, it blows whether I remote-start it or get in the truck and start it.

I understand the argument that the air could be slightly warmer than the outside, but shouldnt it be focused only on front defroster and not on the feet?

 

[speedracernc]

It's finally been cold enough for me to notice but I also have this 'change'. I distinctively remember the HVAC not starting until the engine was up to temp. Now, it blows whether I remote-start it or get in the truck and start it.

I understand the argument that the air could be slightly warmer than the outside, but shouldnt it be focused only on front defroster and not on the feet?

I totally agree. This is a change from last year. It has to be from an update. Wasn't there one over the summer that happened automatically?

 

[djjr50]

I totally agree. This is a change from last year. It has to be from an update. Wasn't there one over the summer that happened automatically?

There was one that trickled out through most of 2020. Dont recall when I got mine.

 

[Rebelguy2020]

I leave mine in auto, set at 23C, In the winter I use the remote start at least twice per day, before going to work and after work, I did notice that the blower will not speed up until the engine warms up, the steering warms up, the driver heated seat warms up, the front defrost goes on and the rear window defrost goes on. Set it and forget it.

This is my first diesel, the engine will rev up automatically until it reaches a certain temp, the diesel does not warm up as fast like my Hemi, I have the winter front and the trip to work is 25 minutes on a highway, the cabin temperature is met after a short period but the engine temperature takes almost the whole 25 minutes to get to 100 C. I don’t think it would make it to 100C during city driving in the winter.

 

[smonska]

I am sending my truck in this week for this, starting the truck up cold (42F this morning) in auto mode the fan starts blasting on high. I'm hoping by this point in 2021 there's a software fix?

Did anyone ever get this successfully resolved by a dealer?

 

[smonska]

I had no luck at the dealership, I left it overnight, but it wasn't a cold morning. Tech said "cannot duplicate problem, no software update performed". I'll be trying again this fall I guess... Pretty disappointed.

 

[scottmoyer]

Just an FYI for you guys. I was complaining about this today in my '21 Rebel. I live in Florida and it's 90* outside. I start the truck in the garage and the fan is on 4 or 5 in the auto setting. I have my AC set to 72* and the fan never slows down. The high speed blowing gets annoying. I couldn't get the fan to slow down until I manually adjusted the interior temp to 79*, and even then, it dropped maybe one fan speed.

My 2006 Silverado had auto temp and when the interior temp was warm, the AC and fan would run on high until the interior temp got to my temp setting. The fan then lowered to just maintain the temp. It would increase or decrease as needed to maintain the temp.

It doesn't look like they ever fixed this!