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Anyone know what module controls the HVAC during remote start?

rah7777777

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rah7777777 Enthusiast

rah7777777

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Anyone know what module controls the HVAC during remote start on a 2018 Silverado?

 

Long story short, I hate how the truck automatically turns on the A/C when it is remote started (even if I had the HVAC off when I parked it) and then once the key goes in the ignition, it turns back off. I'm curious what module is sending this command to the HVAC system. 

I'm trying to review all my options on correcting the problem for myself. A problem that I realize most folks don't have any issues with and think i'm stupid for wanting it different. 

 

My last resort will be to wire in a switch to the compressor clutch relay that I can flip on and off from inside and hope that doesn't through some type of codes.

If its above say 90 out, i like the A/C to automatically come on, but since GM has set it up to come on at 59 degrees, it ends up freezing me out and then I roll down the windows (which is how I usually drive) and it fogs my windows up.

If GM would have the remote start look at last known settings, I'd be perfect and happy as can be, but since they got rid of that ability and decided they should always control my comfort i'm forced to look at other options. 

 

Thank you!

xMEATxHAMMERx Enthusiast

xMEATxHAMMERx

Posted
Posted
Anyone know what module controls the HVAC during remote start on a 2018 Silverado?
 
Long story short, I hate how the truck automatically turns on the A/C when it is remote started (even if I had the HVAC off when I parked it) and then once the key goes in the ignition, it turns back off. I'm curious what module is sending this command to the HVAC system. 
I'm trying to review all my options on correcting the problem for myself. A problem that I realize most folks don't have any issues with and think i'm stupid for wanting it different. 
 
My last resort will be to wire in a switch to the compressor clutch relay that I can flip on and off from inside and hope that doesn't through some type of codes.
If its above say 90 out, i like the A/C to automatically come on, but since GM has set it up to come on at 59 degrees, it ends up freezing me out and then I roll down the windows (which is how I usually drive) and it fogs my windows up.
If GM would have the remote start look at last known settings, I'd be perfect and happy as can be, but since they got rid of that ability and decided they should always control my comfort i'm forced to look at other options. 
 
Thank you!
Why use the remote start if not for the temperature benefits?

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rah7777777 Enthusiast

rah7777777

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I like to let my motor warm up a bit before I touch the gas. I drive a lot of short trips and if I didn’t let it warm up a little, it wouldn’t even get hot before I shut her off. 

 

there are no settings for it on my 18. 

 

Ive read you could change it on 14-15, but as of 16+ dealer can’t change it. 

hirdlej Enthusiast

hirdlej

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Posted

I agree with the original poster.  I always remote start my truck before getting in.  Why?  Because of the stupid EPA cat-light-off is why.  I don't want to get in my truck, wait for 2 minutes for the engine to settle down before I put it into gear.  I'm not a fan at shifting into drive or reverse at 1500 rpm's.  If I don't remote start, then I have to listen to the engine roar and sit at high idle until the catalytic converters light off.  I miss the 90's when I could just turn the key and the car would idle at a reasonable RPM.

Snowcamo Senior Enthusiast

Snowcamo

Posted
Posted
I agree with the original poster.  I always remote start my truck before getting in.  Why?  Because of the stupid EPA cat-light-off is why.  I don't want to get in my truck, wait for 2 minutes for the engine to settle down before I put it into gear.  I'm not a fan at shifting into drive or reverse at 1500 rpm's.  If I don't remote start, then I have to listen to the engine roar and sit at high idle until the catalytic converters light off.  I miss the 90's when I could just turn the key and the car would idle at a reasonable RPM.
I always wondered why these engines take a long time to idle down. So cat-light-off?

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HeySkippyDog Senior Enthusiast

HeySkippyDog

Posted
Posted

I live in Florida and having AC on with remote start is amazing.

I have no complaints about it.

Eat more cheeseburgers and be a sweaty bastard like the rest of us and you'll like it too. [emoji23][emoji23]

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CamGTP Senior Enthusiast

CamGTP

Posted
Posted

The first 30 seconds of engine run time are where it will pollute the air the most and the emission standards for that are pretty tough.

 

The idea is to get cylinder temps and exhaust temps as hot as possible. They will run negative timing and the open loop EQ ratio (fuel ratio) is far richer than when warm to make it do what is needed.

rah7777777 Enthusiast

rah7777777

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8 hours ago, HeySkippyDog said:

I live in Florida and having AC on with remote start is amazing.

I have no complaints about it.

Eat more cheeseburgers and be a sweaty bastard like the rest of us and you'll like it too. emoji23.pngemoji23.png

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Im in Texas, it’s hot here too.

But GM decided 59 degrees (literally) and above, the compressor kicks on. When it’s a 60 degree cold morning and still dark out, this makes for a F’n frozen truck when I get in. 

 

But what pisses me off the most... I usually drive with windows down to work in the mornings, usually still dark out. So say it’s 62 out, remote start it and A/C comes on full blast, thanks GM! ?,  get in and put the key in the ignition, it reverts back to how i had it last, now the compressor shuts off and blower motor goes back to 1/2 speed (where I usually keep it for outside air circulation) but now since compressor is off, it starts to really fog up all the windows with all that moisture the evaporator case was building up from when the A/C was actually running. 

Fogs up my windows and makes it harder to see since it’s dark out. 

 

Its 62 degrees, the sun is on the other side of the world, why does GM force me to have the A/C on with remote start? 

 

I know it may sound stupid to some. But I absolutely can’t stand this. I just want it to work like my old 2002 Silverado with aftermarket remote start, it looks at whatever setting it used last. 

HeySkippyDog Senior Enthusiast

HeySkippyDog

Posted
Posted

I'm the guy who will jump in the pool when it's 38 degrees outside, and I'll stay in a solid 20 minutes. My lady loves it, I radiate heat and it keeps her warm, she's a skinny little thing and always wants to turn the thermostat to 78. Our kids radiate half a megawatt of thermal energy too. It's our superpower. I'm loving the frosty truck on cold mornings. It wakes me up.

I get it though, you're right. It should be a setting the user can adjust. Doesn't seem like it would have been difficult to do, it was just overlooked.

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rah7777777 Enthusiast

rah7777777

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Haha! I can deal with the cold, I’m not exactly skinny or close to my high school weight, it’s mainly the foggy windows that piss me off when I’m trying to enjoy the fresh air on my way to work. 

 

And the musty smell that goes with the foggy windows. 

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