66 Degree Outside Air Becomes 80 Degree Inside Heat!

OldGuy · 05-08-2013, 06:50 PM

During our recent nice weather, I put on the inside fan but turned OFF air conditioner compressor, as it wasn't hot outside. Temp dial was all the way down at 60 degrees and vent arrow causes air to come entirely through the dash grills. Fine, except the outside air today was 66 degrees but the air being blown into the cabin felt like it had been heated to maybe 80 degrees! Is there anyway (short of running the compressor) to avoid having that nice cool, comfortable outside air be warmed on its way into the cabin?

Cmike2780 · 05-08-2013, 07:07 PM

There's a button that lowers the windows. Jk

Nothing wrong with using the compressor. Make sure the air source is set to come from outside and not circulate?

Fountainhead · 05-08-2013, 08:54 PM

I think OP was noticing the effect of no refrigerant flowing to remove heat from the coils, the coils if no refrigerant is flowing are at the same temp as ambient engine air, so when you turn on the vent it's still flowing across the AC evaporator coils which are heated by ambient air around engine, heat from road, many heat sources radiating into those pipes. Beside, the coolant doesn't circulate when the A/C compressor isn't pumping.
I think modern cars don't have a complete bypass for outside air only.

DEpointfive0 · 05-08-2013, 09:00 PM

Quote:

Originally Posted by OldGuy

During our recent nice weather, I put on the inside fan but turned OFF air conditioner compressor, as it wasn't hot outside. Temp dial was all the way down at 60 degrees and vent arrow causes air to come entirely through the dash grills. Fine, except the outside air today was 66 degrees but the air being blown into the cabin felt like it had been heated to maybe 80 degrees! Is there anyway (short of running the compressor) to avoid having that nice cool, comfortable outside air be warmed on its way into the cabin?

In a word, no. Not without some major and/or unique mods
Roll the window down FTW! Lol

SouthArk370Z · 05-09-2013, 01:00 PM

It happens to me only in stop-and-go traffic. Once I get moving for a while the temp drops. I assumed that engine compartment heat was warming up the air ducts, but Fountainhead may be on the right track.

Cmike2780 · 05-09-2013, 02:13 PM

Roof vent mod?

Fountainhead · 05-09-2013, 02:27 PM

Quote:

Originally Posted by Cmike2780

Roof vent mod?

It's called a convertible, as nice as FL is for me it's WAAAYY too hot for a ragtop, not to mention you can't lock the doors, cause they'll cut their way in to find nothing worth stealing, or if you do put a nice head unit in they'll steal that quite easily.

I just roll down the windows, I really like the Z with windows down, usually I'm a windows up kind of guy but with the Z.....it's just different.

05-08-2013, 06:50 PM	#1 (permalink)
OldGuy Base Member Join Date: Dec 2009 Location: Greensburg PA Posts: 899 Drives: '09370Z Red Base A7 Rep Power: 16	66 Degree Outside Air Becomes 80 Degree Inside Heat! During our recent nice weather, I put on the inside fan but turned OFF air conditioner compressor, as it wasn't hot outside. Temp dial was all the way down at 60 degrees and vent arrow causes air to come entirely through the dash grills. Fine, except the outside air today was 66 degrees but the air being blown into the cabin felt like it had been heated to maybe 80 degrees! Is there anyway (short of running the compressor) to avoid having that nice cool, comfortable outside air be warmed on its way into the cabin?

05-08-2013, 07:07 PM	#2 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 28	There's a button that lowers the windows. Jk Nothing wrong with using the compressor. Make sure the air source is set to come from outside and not circulate? Akbubba47 likes this. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

05-08-2013, 08:54 PM	#3 (permalink)
Fountainhead Track Member Join Date: Feb 2013 Location: FL Posts: 834 Drives: 2019 Civic Type R Rep Power: 14	I think OP was noticing the effect of no refrigerant flowing to remove heat from the coils, the coils if no refrigerant is flowing are at the same temp as ambient engine air, so when you turn on the vent it's still flowing across the AC evaporator coils which are heated by ambient air around engine, heat from road, many heat sources radiating into those pipes. Beside, the coolant doesn't circulate when the A/C compressor isn't pumping. I think modern cars don't have a complete bypass for outside air only. Montez and DEpointfive0 like this.

05-09-2013, 01:00 PM	#5 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	It happens to me only in stop-and-go traffic. Once I get moving for a while the temp drops. I assumed that engine compartment heat was warming up the air ducts, but Fountainhead may be on the right track. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

05-09-2013, 02:13 PM	#6 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 28	Roof vent mod? __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

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