Evaporator - any magical fix?

[packmule1911]

Over the last year I've replaced the condensor, compressor, orifice tube, pressure lines, drier, and flushed solvent through the evaporator in order to get some semblance of decent factory air. No luck. Giving up. Not interested in taking out the dash, or paying someone to do it in order to put in a new evaporator.

Is there anything else to try?


Sent from my iPhone using Tapatalk

[4.3LXJ]

It is not leaking?

[packmule1911]

Nope. No leaks. If I remember the Tech correctly, I have 18 degrees going in and 70-ish at the dash. Pressures are all within spec. There's cold, but it's cooling.


Sent from my iPhone using Tapatalk

[4.3LXJ]

If it is charged properly, then check your blend door. Also is this temp measured when the cabin air is at 100?

[packmule1911]

I have a new blend door actuator motor, but no picture of how to get at the door and make a diagnosis or repair.

Not sure of cabin temp at the time.

Essentially, everything is new forward of the firewall.


Sent from my iPhone using Tapatalk

[4.3LXJ]

OK, here is a basic thing most people don't know. An AC system will only lower the temp of air about 30°. So if you put 100° air in to the coil, it will spit out 70° air. House systems only lower the air 20°. You should use the recirculation function on very hot days so you can cool that air additionally once it starts coming down. If a system was capable of lowering the air more than that, you would end up freezing the coil and have a block of ice, then it would feel like it quit working. That is why on your house system for instance your thermostat will not go below 55°. Below that and you get a block of ice

[packmule1911]

Yes, we've had our home HVAC lock up as a block of ice before.

Readings:

Static pressures 80psi @ 70 degrees.
Low side around 20psi.
High side 170psi.

The blend door was tested and had full articulation.

[4.3LXJ]

I don't have gauges for R134A. Do yoiu have the corresponding temps for those pressures?

[packmule1911]

I don't have gauges for R134A. Do yoiu have the corresponding temps for those pressures?


Those are the readings that the shop collected on their machine.

[4.3LXJ]

I am old school. I charge fixed orifice systems by measuring superheat. That is the theoretical temp measured by pressure inside the coil minus the actual temp of the suction line.

[packmule1911]

I am old school. I charge fixed orifice systems by measuring superheat. That is the theoretical temp measured by pressure inside the coil minus the actual temp of the suction line.

I'm all for old-school. Don't imagine you're in NC are you? Thanks for your thoughts on this issue.

[4.3LXJ]

No, I am at the other end of the country