Hot air

187 Views 7 Replies 4 Participants Last post by cutlea01, 5 d ago

Pegasus

Discussion Starter · 6 d ago

Hi All, was on a journey in evening (no sun) and got stuck in about a mile of slow moving stop/start traffic (road works). The outside temp was 18C and the temp control was set at 17C with both S/S and A/C off. Whilst in this tailback the air coming from the vents just got warmer and warmer 🥵. Is this just an(other) annoying JLR idiosyncrasy or indication that something isn't quite right? Never experienced this with any other car.

Turning the A/C finally produced cool air. And I still get/have pending codes P2B61(73) or P26CB(72) popping up even though the PCM has been updated (as in a previous post last September).

Paul

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cutlea01

· #2 · 6 d ago

Erm, isn't that what air conditioning, or rather climate control is for? To supply air in the cabin at a comfortable temperature. Why turn it off? I don't think I've ever turned mine off in any car in decades. Cool in the summer and dry mist free air in the winter.

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Pegasus

Discussion Starter · #3 · 6 d ago

cutlea01 said:
Erm, isn't that what air conditioning, or rather climate control is for? To supply air in the cabin at a comfortable temperature. Why turn it off? I don't think I've ever turned mine off in any car in decades. Cool in the summer and dry mist free air in the winter.

Yes - but I didn't expect to get hot air out of the vents when the CC was set to a temp lower than ambient. I'd have thought that I'd be getting air at ambient rather than being heated up.

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TheStig

· #4 · 6 d ago

There is a lot of additional ducting for the air to travel through when a car is fitted with climate control as well as the condenser to navigate. That provides plenty of opportunity for the air to be heated especially with the car stationary & the heat sink from the engine.

Also, if you don't run the ac, the compressor seals will dry out & you'll start needing regular regasses.

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cutlea01

· #5 · 6 d ago

Also the heater element inside the dash is at full engine heat at all time, this is blended with air drawn over the cold condenser to provide the desired air temperature. A bit more complicated as there's also an electrically heated element too for fast winter air warm up.

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Pegasus

Discussion Starter · #6 · 6 d ago

Thanks for info. Agree re A/C - it's normally on but must've hit it off at some point and didn't notice until it was getting a bit warm.

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OBC John

· #7 · 6 d ago

Adopting pedantic mode.

It's the evaporator that cools the air down, not the condenser.

But I agree that you should never turn off the AC.

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cutlea01

· #8 · 5 d ago

Thanks John, my bad. I get them muddled up. Happy as always to stand corrected.

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