Interior Heater Not Working?
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Junior Member
Joined: Feb 2006
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EQS Sedan, W222, W221, W220
Interior Heater Not Working?
Now that it is cold outside, it has become obvious that our car does not put out any hot air. The air coming out of the vent is very cold.
How do other people find the heater? Is your air warm when it is cold outside?
How do other people find the heater? Is your air warm when it is cold outside?
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S580
The mornings and evenings started getting into the 40's recently and I used my heater. It worked as expected. I happened to have the driver screen set to display watts per mile and seen a large number (from memory) about 1000 or more which is much higher then I ever seen from using the air conditioner. Never have any of the accessories (climate, massage, audio) caused enough draw for me to alter my driving habit or charging plan.
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My heating works just fine. It is almost immediate on a cold morning. I generally keep the temp setting on 72-74 for AC in the warm months (ambient temps in the 80s-90s), and reduce that to 70-68 when I need heat. Today it was 45 outside and I had immediate heat and had to reduce the temp setting to 68.
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From: Suburban Philadelphia
2019 G63
Heating and new issue
I discovered the climate settings and have mine set for each weekday morning about the time I leave for work, then again in the afternoon when I expect to go home. Works great and automatically switches from heating to cooling if a warm day outside. I love the feature!
Do have my AMG EQS in for service where the two AMG controls incorporated in the steering wheel went blank and no longer function! Dealer will have had the car a week tomorrow so obviously have difficulty with the service.
Do have my AMG EQS in for service where the two AMG controls incorporated in the steering wheel went blank and no longer function! Dealer will have had the car a week tomorrow so obviously have difficulty with the service.
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2025 EQS580
My heating works just fine. It is almost immediate on a cold morning. I generally keep the temp setting on 72-74 for AC in the warm months (ambient temps in the 80s-90s), and reduce that to 70-68 when I need heat. Today it was 45 outside and I had immediate heat and had to reduce the temp setting to 68.
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EQS Sedan, W222, W221, W220
We have been told that the heater control module has a fault in it. Dealer having to contact Mercedes, as they have no experience with this. Probably will be several days in the shop.
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From: Ontario, CANADA
2008 C63 AMG, 2022 EQS 580, 2019 C300 cabriolet, 2017 E 300
Just before Christmas my EQS heater failed. It's not a good thing in Canada to have no heat. Basically, it's like a hair dryer somewhere under the dash, but alas there are NONE in North America. So I have a loaner until it's fixed. ETA on the part from Germany is February 20.
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Just before Christmas my EQS heater failed. It's not a good thing in Canada to have no heat. Basically, it's like a hair dryer somewhere under the dash, but alas there are NONE in North America. So I have a loaner until it's fixed. ETA on the part from Germany is February 20.
The main heater element on the EQS is a PTC heater in the low temperature coolant circuit. This is a high power resistor, a bit like the one some houses have for hot water heating. In addition the EQS has the heat pump, the HVAC system working in reverse. I guess this is a market area dependent option even in the EQS.
The PTC heater element seems to have failed on other Mercedes EVs more often than reasonable. Perhaps the same issue here.
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No Mercedes yet
I had to look up "PTC"; I think this is what the previous poster was referring to:
https://en.wikipedia.org/wiki/Thermistor#PTC
https://en.wikipedia.org/wiki/Thermistor#PTC
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From: NM
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That plus the fact that the EQE SUV will be the FIRST EQ to have a heat pump. (From what I understand, It is still not a true heat pump)
The lack of a heat pump is why the EQS losses a large percentage of range in cold temps.
It’s definitely in the top 5 of the poor engineering decisions list for this EQS.
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I am 1000% sure that the EQS does not have a heat pump. This was a big debate when the EQS launched. The entire EV industry was wondering why MB would launch such a vehicle without a heat pump.
That plus the fact that the EQE SUV will be the FIRST EQ to have a heat pump. (From what I understand, It is still not a true heat pump)
The lack of a heat pump is why the EQS losses a large percentage of range in cold temps.
It’s definitely in the top 5 of the poor engineering decisions list for this EQS.
That plus the fact that the EQE SUV will be the FIRST EQ to have a heat pump. (From what I understand, It is still not a true heat pump)
The lack of a heat pump is why the EQS losses a large percentage of range in cold temps.
It’s definitely in the top 5 of the poor engineering decisions list for this EQS.
No wonder the EQS has no heat if the PTC heater is broken.
Can you share more details about the EQE SUV heat pump, why is it not a true heat pump?
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From: NM
2023 AMG EQS
Originally Posted by EQE SUV Order Guide
Heat Pump which utilizes waste heat from the e-motor and inverter, to heat the cabin thus improving winter range.
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Mercedes does not use a heat pump, and its not necessary. In really low temperatures a heat pump is useless, thus, cars with heat pumps also use resistive heaters. The Mercedes' EV heating system approches the efficiecy of a heat pump at less extreme temperatures without the complexity or cost of a heat pump. It also has the additional benefit that its ICE inspired radiator type system is equally adept at cooling so power limiting due to excessive battery overheating is almost unheard of.People hear some new term that they don't understand and suddenly every one just walks like a lemming off a cliff.
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A proper heat pump works well below -20 degrees Celsius (decent efficiency). One might claim EQS does not need it because it has a big battery and the range is still sufficient at low temperatures.
Considering how owners at this forum talk about savings with ECO+ modes etc. I'd say many would still like to have the efficiency improvement from a heat pump if they often drive at temperatures below +10 degrees Celsius (50 F).
Heat pump would not cool the battery, might be used for heating the battery but I would not consider that necessary. Just heating the interior makes sense (for some of us).
Considering how owners at this forum talk about savings with ECO+ modes etc. I'd say many would still like to have the efficiency improvement from a heat pump if they often drive at temperatures below +10 degrees Celsius (50 F).
Heat pump would not cool the battery, might be used for heating the battery but I would not consider that necessary. Just heating the interior makes sense (for some of us).
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Absolutely incorrect. We are not talking about a house. A heat pump works by differential in temperature (its an AC compressor in reverse). The pipes on a home installation are buried under the frost line, thus maintaining efficiency at very low temperature, thats nowhere similar to the situation in a vehicle. In an EV, nothing makes significant heat. Thus, as the temp gets colder, the pump has no gradient in temperature to work with. Below 20 degrees in starts to struggle, and below zero its just dead weight.
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Absolutely incorrect. We are not talking about a house. A heat pump works by differential in temperature (its an AC compressor in reverse). The pipes on a home installation are buried under the frost line, thus maintaining efficiency at very low temperature, thats nowhere similar to the situation in a vehicle. In an EV, nothing makes significant heat. Thus, as the temp gets colder, the pump has no gradient in temperature to work with. Below 20 degrees in starts to struggle, and below zero its just dead weight.
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Again, there has to be a temperature differential....My daughter has heatpump AC in Seattle. It works great till around the 20s below that they also have resistive elements. Just like a normal AC cant cool air at low temps! It just turns off the compressor!
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.
Normal AC can cool at low air temps. I cooled a mainframe computer in my garage and the AC kept cooling even when the outside temps were in the 40°F range. At that time I maintained a 65°F temperature year around in the garage. If the AC stopped working the temperature would soar into 3 digit territory within 5 minutes during the overheated shut down. (I didn't have 3 phase battery backup.)
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Normal AC can cool at low air temps. I cooled a mainframe computer in my garage and the AC kept cooling even when the outside temps were in the 40°F range. At that time I maintained a 65°F temperature year around in the garage. If the AC stopped working the temperature would soar into 3 digit territory within 5 minutes during the overheated shut down. (I didn't have 3 phase battery backup.)
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2020 AMG GLC63
I am 1000% sure that the EQS does not have a heat pump. This was a big debate when the EQS launched. The entire EV industry was wondering why MB would launch such a vehicle without a heat pump.
That plus the fact that the EQE SUV will be the FIRST EQ to have a heat pump. (From what I understand, It is still not a true heat pump)
The lack of a heat pump is why the EQS losses a large percentage of range in cold temps.
It’s definitely in the top 5 of the poor engineering decisions list for this EQS.
That plus the fact that the EQE SUV will be the FIRST EQ to have a heat pump. (From what I understand, It is still not a true heat pump)
The lack of a heat pump is why the EQS losses a large percentage of range in cold temps.
It’s definitely in the top 5 of the poor engineering decisions list for this EQS.
https://group-media.mercedes-benz.co...l?oid=51162885
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The example video above shows a heat pump that works (efficiently enough) at -13 F. This pump is intended for house heating but what would prevent the same technology being used in cars? Perhaps these are not common in the US but it does not mean they do not exist or would not be common elsewhere (like northern Europe). My understanding is that the main thing is the type of gas used. The cheap and traditional ones may not work but those are not allowed any more (in Europe). ICE cars run on CO2 even if only for cooling.
