A/C always way too cold?

Two comments here. Firstly, everybody has the issue that they have to set the temperature higher than they had imagined would be the case to get the temperature they want. Everybody, including people without heat pumps. Whether this is the "Chinese cars" explanation or not, the offset appears to be about five degrees, and you just have to do it. I find that apart from that little foible the HVAC works really well.

Secondly, some people have mentioned an issue with the car being too cold on one setting then too warm only a degree higher. I think I know one explanation. I noticed this just once, just after the car had been "serviced" and wondered if some software update had jemmied things. Then I realised that the vents weren't set to blow anywhere at all. All of them were off. When I fixed that so that at least one set of vents was set to blow, all was well again. So if you find that you're either cold or hot and nothing in between, check your vent settings.
 
I've been to the dealer with this issue numerous times. They say it is a sensir issue and are 'looking for a fix'. The inside temp is offset 5 degrees. So 20 degrees is actually 15, so it will feel cold! I set it to 25/26, then push auto, then turn ac off, which also.takes the heating of auto, but leaves the fan on auto. Hope this makes sense.
 
Rolfe said:
Two comments here. Firstly, everybody has the issue that they have to set the temperature higher than they had imagined would be the case to get the temperature they want. Everybody, including people without heat pumps. Whether this is the "Chinese cars" explanation or not, the offset appears to be about five degrees, and you just have to do it. I find that apart from that little foible the HVAC works really well.

Secondly, some people have mentioned an issue with the car being too cold on one setting then too warm only a degree higher. I think I know one explanation. I noticed this just once, just after the car had been "serviced" and wondered if some software update had jemmied things. Then I realised that the vents weren't set to blow anywhere at all. All of them were off. When I fixed that so that at least one set of vents was set to blow, all was well again. So if you find that you're either cold or hot and nothing in between, check your vent settings.
Click to expand...
I always have my vents open. Usually the ones blowing to the feet and the ones aiming at the windows to prevent the windows from fogging up (in cold and rainy weather). But my problem is not about too hot/too cold.
Four months ago the dealer said they knew about the heatpump system not being able to keep it at a certain temperature. At some point the temp is perfect. Not too hot. The system then shuts off the heating completely, only to continue blowing cold air into the cabin.
It isn't happening with all heatpump systems but both 2022 and 2023 could have it. MG is supposedly looking for a hardware fix in the electronics regulating the pump. In May they tried a software fix but it did not improve at all.
All suggested tricks (eco mode, a/c off, Auto on/off) have no effect. To get it working again, you need to up the temp with 2 degrees (one does not do anything on mine), or you wait until the cabin temp drops enough to somehow trigger the sensors to start heating again. I tested the second option on a cold April day (+4 deg.) It took 20 km's on an 80 km trip before it started heating again.....
 
The vents can be open but still not turned on, so check on the infotainment screen. But you're right, your problem seems more fundamental than that.
 
There's a thread somewhere about how inaccurate the app's reporting of the internal temperature is. I think I even started it.

Does anyone believe this? (Internal/external temperature readings)

This morning. Checked car to make sure he was awake and ready to accept a pre-heat command later. Internal temperature 9°C External temperature -7°C Last driven on Friday afternoon (that's the day before yesterday), and even then not far enough to warm the cabin. Given the frost on my windows...
www.mgevs.com www.mgevs.com
 
OriginalBigAl said:
I went back to normal A/C mode which for reasons unknown worked for me.
Click to expand...
There is something with ecomode in HVAC. You were on to something.

I've been experimenting with it and I'm not 100% sure yet. But somehow it is now working as expected when I cool the car. If I set it to say 22 degrees, it isn't stone cold anymore. I even tried cooling the car with an outside temp of 22 to cool it at 22 without a/c, and it more or less worked with eco mode activated. Mind you, each time you up or lower the temp A/C kicks in.
It looks like ecomode sort of removes the overshoot in heating or cooling.
 
Last edited:
NLMGSAN said:
There is something with ecomode in HVAC. You were on to something.

I've been experimenting with it and I'm not 100% sure yet. But somehow it is now working as expected when I cool the car. If I set it to say 22 degrees, it isn't stone cold anymore. I even tried cooling the car with an outside temp of 22 to cool it at 22 without a/c, and it more or less worked with eco mode activated. Mind you, each time you up or lower the temp A/C kicks in.
It looks like ecomode sort of removes the overshoot in heating or cooling.
Click to expand...
Eco mode halves the a/c power. Unfortunately it doesn’t half the PTC consumption as much. You need to enable ‘energy saving mode’ to affect the PTC heater.

Btw, I also found out my ICE Stonic my25 also has a PTC heater: apparently without it the engine doesn’t reach operating temperature quick enough due to the fuel saving features.

Also, if you go to the mg4 quick guide, you’ll see a picture of the A/C gauge. It shows 22 in the manual where it now shows 25 in the car.

I wonder why they changed the gauge numbers for production.

IMG_3546.jpeg
 
Software fix incoming to realign the temperature control to cabin temperature rather than vent temperature? ?
 
siteguru said:
Software fix incoming to realign the temperature control to cabin temperature rather than vent temperature? ?
Click to expand...
IMHO it was never vent temp. That’s something Bjorn corroborated from his measurements and from his findings on other Chinese cars. But my own measurements tell a different story altogether.
 
Yeah. The key thing is that we've always had to set the control 3-4 degrees higher to get an equivalent cabin temperature to what we've been used to in other cars. It's not really a problem for me, but having the control match actual would be nice. :)
 

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