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That makes no sense if you are actually not seeing 24V at the temp switch

You have a bad connection in the other direction, you should see 24V. You need to start looking at circuit 435, does the high and low speed work on the front evap? You can also look at 435 C/D trying both the low and high fan position.

Just for giggles touch the heater core (carefully) it is accessible on the left side of the evap between the evap and the tunnel and make sure it is not hot. It should be making some cold air, the numbers are not that far off. What are the numbers at around 1800 rpm?

According to the chart I looked at for 134A those numbers would be about right for 100F but IIRC that would be with an engine speed of 1800-2000RPM not at idle.

Do you have the schematic? Start at wire 435 at the temp switch mounted to the evap, if you have power there continue with 438, 436 etc. if not back up towards the AC switch.

Sorry, I see you addressed the water valve, are you sure you had it blocked?

If a dealer says "replacement" then unfortunately it is usually a cheap knockoff even though it may not be "cheap" :(

So you need to check 415A at the relay and the feed 445A, if you have 24V at both of those then ether the relay is bad or the relay ground is bad.

AH, OK I am the one confused, nothing unusual about that :)

I am also interested as this is not the first time I have heard that. Where did you buy the turn signal switch?

The OP does not have a running compressor at this time so the pressures would be equal, of course it will not look that way because the gauges have different scales.

The power for the rear evap. and left cond. come from the other 30A breaker in the battery box,,, wire #720A, nothing to do with any of the 445(X) circuit at all.

Jump the low pressure switch and find out.

No 437 comes from the cond relay, follow the numbers, 436 controls the relay coming from the low pressure switch.

The gauges should read the same when "off" as the system will equalize.

Do you have a schematic of the rear evap? The first thing I would do is see if there is power at 720A at the rear evap, should be hot all the time.

The power for the left side cond fans gets its power from the rear evap, not the rear cond relay, follow 416A

If you can post the schematic you are using so we can all see the same thing.

If both sets of fans are powered by the same relay and you have power to one but not the other than you must have a wiring issue.

The buss bar will be the most covenant