Thread: Random air con

Originally Posted by DiscoJeffster

Feedback is the gauges aren’t a good indicator. Well worth getting it dumped, weighed and refilled.

Gauges are a decent indicator of "is it running or not". ie. If the displacement valve is stuck you'll have a low high side and high low side (ie it's not moving much gas). You won't get a reliable indicator of charge level though.

I've never played with a dual evaporator unit, but it would be worth checking the pressures when it's working well (ie the rear is running flat out) vs not working well (or at all).
If the symptoms are reproducible it should be a doddle.

Given the described symptoms, have a think about this as a scenario.

A sensor is keeping the displacement valve wide open. With the front evap only the thing gets so cold it ices up. Requires a manual off/on cycle to defrost it. With the rear evap on the extra demand is enough to keep the suction temp above freezing and everything is peachy.

If you can manually turn it off then it won't be a physically jammed valve. Cabin temp sensor telling the controller it's always too hot? Do you have a scan tool?

If the evap is icing you'll see that on the gauges anyway.

All fixed now,

Was just a partially blocked pollen filter, I'm pretty pleased to say the least...

Mine was fixed last week - new compressor.
Regas last summer and pollen filter didn't help. Compressor fault diagnosed I don't know what exactly.
Happily covered by my extended warranty/insurance.