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View Full Version : Heat & A/C What is a good vent temp on a 100 degree day?


rothsean
08-06-2014, 04:19 PM
Driving around at 55mph I am getting anywhere between 55 and 62 coming out of the vents. This is in MAX Ac mode.


Is that a normal temp?
Bitsyncmaster
08-06-2014, 04:48 PM
This summer has not had many really hot days. When we get one I will check what I get but on MAX where it recirculates the air a lot depends on the sun heating the cabin and how long you have had it running on MAX
NightFlyer
08-06-2014, 06:11 PM
Driving around at 55mph I am getting anywhere between 55 and 62 coming out of the vents. This is in MAX Ac mode.


Is that a normal temp?

Depends - what type of refrigerant are you running in your system and how do you have your low pressure switch adjusted?
gamerguy51
08-06-2014, 09:42 PM
anything under 100 degrees is great!
jawn101
08-07-2014, 09:49 PM
Where's Ron when you need him?

In reality, you're seeing a 40-50 degree drop there in vent temperature from outside ambient. That sounds about right to me.
rothsean
08-11-2014, 01:44 AM
Depends - what type of refrigerant are you running in your system and how do you have your low pressure switch adjusted?

I am running r12. It seems to cycle off around 20psi.
NightFlyer
08-11-2014, 11:03 AM
I am running r12. It seems to cycle off around 20psi.

Mid 40Fs to low 50Fs would be the target range for R-12 in 100F.

So you are running about 10F higher than normal.

You may be freezing up the evaporator slightly running the LPS at a 20psi cutoff, which would hinder the performance of your system. I'd try bumping up the LPS cut-off to somewhere around 25psi, which was the stock/OEM setting for R-12.

If that doesn't improve performance, then you may have less than a full charge in your system.
Ron
08-11-2014, 06:01 PM
Where's Ron when you need him?

In reality, you're seeing a 40-50 degree drop there in vent temperature from outside ambient. That sounds about right to me.

LOL

At 100F ambient, the output should be 38-42F. [IDEAL]
At 100F- Reset your cycle switch to 28.5psi (25-32). If output temp doesn't come down, see if high side is 190-230psi and go from there. (Measurements taken when the clutch cuts out; WS-N:09:01)