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Hi all,

Well it appears that the evaporator in a stock Brumby a/c system has a weird (and long unavailable) TX valve. Anybody had to replace the TX valve before or know of where these might be available from?

At this stage it seems like some fabrication will be required with an aftermarket valve.

Thanks in advance.

what is TX valve? Where is it located? Would a used one be an option? If it is the baby attached to the evap with a knob to adjust things colder with temp bulb right in with evap?

steptoe wrote:what is TX valve? Where is it located? Would a used one be an option? If it is the baby attached to the evap with a knob to adjust things colder with temp bulb right in with evap?

A used one might be an option - but good luck finding an evaporator for one of these systems! It is located inline in the piping from the compressor to the coils (inside the evaporator) and restricts refrigerant flow to effect cooling.

At the moment my system intermittently fails and has the same pressure on both sides of the system, which would indicate a faulty valve.

Try Ashdown Ingram.. and take the old one with you, they may be able to match or make something else work??

a photo may help if you can

If you have the TX valve in your hands it will be easier to match one up. I would be re evaluating your diagnosis of the valve though. Typically a TX valve will either fail in the closed position (showing an extremely low pressure or vacuum on the low side) or fail open, which will allow liquid refridgerant into the compressor causing it to hydraulic. When the AC fails, what are the gauges doing? A high pressure on the low side could mean a faulty valve in the compressor, a rapidly increasing pressure on the high side could signify air in the system. A system that works, the fails, then works again after a short period of time could mean there is moisture in the refridgerant that the receiver drier cannot remove, causing the TX valve to freeze up and effectively become blocked.

The car is being worked on by an a/c shop and that was their diagnosis. They have modified the inside of the evaporator to take a universal TX valve because the Subaru one (and I saw it) was some outlandish thing long since unavailable.

I took it from them today and it is blowing VERY cold, so we will give it some time. The compressor did have a valve problem previously (it's a reman) but that was fixed.

Great to hear.. wish my Brumby had cold A/C