Rear HVAC additional AC condenser

[Madsen203]

Hi all,

Placed an order for a Model X 5 seater. Found out the 5 seater May only rely on passive AC cooling from front HVAC. The 6/7 have a possible second condenser line that allows for added cooling power in the rear.

Can any one confirm this? Having a young kid in the car and often traveling through CA hot summer temps, having the added cooling power helps. In the Y, the rear center console vents work OK but when temps pass the mid-80’s, it’s nearly impossible to maintain temps back there—all while having top of the line tint throughout the car.

Thoughts or knowledge about 2022-3 X’s would be grateful!

 

[kchau]

i browsed through the parts catalog briefly and did not find anything other than additional ducting for the third row.

 

[Madsen203]

i browsed through the parts catalog briefly and did not find anything other than additional ducting for the third row.

Any additional refrigerant or extended evaporator coils?

 

[kchau]

Any additional refrigerant or extended evaporator coils?

No

 

[Madsen203]

No

So the whole rear AC is reliant on the front AC? Poor design decision. I thought pre refreshed models had secondary lines to introduce cooler air and more air flow in the rear.

 

[Big Earl]

No

Actually, yes. The rear A/C system has its own blower and evaporator, and the whole system has a larger refrigerant charge.

In pre heat pump vehicles, it also had a 1.5 kW PTC heater in addition to the primary 6 kW PTC heater for the front system. I don’t know how this is handled on a heat pump equipped Model X.

 

[kchau]

Actually, yes. The rear A/C system has its own blower and evaporator, and the whole system has a larger refrigerant charge.

In pre heat pump vehicles, it also had a 1.5 kW PTC heater in addition to the primary 6 kW PTC heater for the front system. I don’t know how this is handled on a heat pump equipped Model X.

Interesting. this is definitely not in the parts catalog

 

[Big Earl]

Interesting. this is definitely not in the parts catalog

Heat pump, pre heat pump or both?

 

[kchau]

Heat pump, pre heat pump or both?

refresh X. So I think I found it, it's depicted here in blue in the general overview for thermal management. However, if you go to the actual blown-up parts diagram, they only show components for the front. Even if you search for "evap", only one part comes up, the thermistor. There is no mention of rear blower motor or any evaporator part number in the epc. Only the front blower motor shows up in a search for "blower"

What does this mean? I don't know.

 

[kchau]

Actually wait, this is the same image used for the pre-refresh X, this is not representative of the Refresh X.

looking through the parts catalog for the pre-refresh X, there is definitely rear hvac components.

 

[kchau]

Here is the break down of the ducts. It could be number 8 as that is an assembly, but that doesn't make any sense to put it there where it's only on one side.

 

[kchau]

Ok, I'm still not convinced that it's there. @Big Earl where is it mentioned that the Refresh X has its own rear HVAC components?

 

[kchau]

So the whole rear AC is reliant on the front AC? Poor design decision. I thought pre refreshed models had secondary lines to introduce cooler air and more air flow in the rear.

If it works, it’s not a poor design decision.

 

[Big Earl]

Sorry, I missed the part about this for the refresh. The last diagram you posted looks like they’ve eliminated the rear unit and are feeding the rear vents from the center console. Interesting!

Honestly, it’s probably better this way. The rear unit was pretty anemic, especially in heat mode. Also fewer parts to break.

 

[kchau]

Sorry, I missed the part about this for the refresh. The last diagram you posted looks like they’ve eliminated the rear unit and are feeding the rear vents from the center console. Interesting!

Aw man you made me dig through the parts catalog for nothing

 

[Big Earl]

Aw man you made me dig through the parts catalog for nothing

Not at all! This was very informative. Thank you for saving me the time, because I had just gotten out my laptop to have a look for myself.

 

[kchau]

Ok, for continuity's sake, Here is the parts diagram for the HVAC assembly, and the center console:

#6 on the center console is the rear airwave unit, which probably has actuators for the third row vents.

 

[mikebev]

If it works, it’s not a poor design decision.

Agreed -- but the problem is, it doesn't work. See this thread for how ineffective third row cooling is on the 7-seater: Model X Plaid Third Row Climate

 

[bballshinobi]

Hi all,

Placed an order for a Model X 5 seater. Found out the 5 seater May only rely on passive AC cooling from front HVAC. The 6/7 have a possible second condenser line that allows for added cooling power in the rear.

Can any one confirm this? Having a young kid in the car and often traveling through CA hot summer temps, having the added cooling power helps. In the Y, the rear center console vents work OK but when temps pass the mid-80’s, it’s nearly impossible to maintain temps back there—all while having top of the line tint throughout the car.

Thoughts or knowledge about 2022-3 X’s would be grateful!

Did you get an answer to this? I read the entire thread but didn’t see a concrete answer. Does the 22 Model X 5-seater have dual AC for the rear? I am thinking about replacing my 21MX 5-seater which doesn’t have dual AC.

 

[kchau]

Did you get an answer to this? I read the entire thread but didn’t see a concrete answer. Does the 22 Model X 5-seater have dual AC for the rear? I am thinking about replacing my 21MX 5-seater which doesn’t have dual AC.

refresh X have a different system altogether. there is no dual AC.