What is a good vent temp on a 100 degree day?

[rothsean]

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]

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]

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]

anything under 100 degrees is great!

[jawn101]

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]

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]

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]

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)