65 plate VRS. It still has DPF issues - which I'll assume are unrelated and we just need to get that replaced when it finally gives up.

We've had the Glow plug with the sensor replaced a few weeks back due to a warning light.

But we've been having a few weird issues lately:

Aircon seems to just stop blowing cold air and has started to blow warm damp air. But if you slow down, say going into a 50 zone, or change down a gear then it seems to kick back in and blow cold again. Maybe it just needs re-gassing?

The rear wiper seems to come on much much more frequently when it's raining.

This weekend the front wiper on auto would ramp up to max speed over a few cycles even though there was only a few drops of rain (no where near enough to be more than a wipe every few seconds). And when I stopped they didn't park themselves.

We have it booked in on Friday, but wondered if anyone had any guesses?

Sounds like multiple and potentially unrelated issues;

1) DPF issues - is your car an oil burner? If its using oil, then you need to get the EGR valve looked at and/or having the possibility of stuck piston rings.

2) Aircon - IMHO - this needs recharging every 2-3 years. If its not been done recently, then go ahead and do it. Sounds like compressor is low on charge and kicking out.

3) Battery voltage - odd voltage/over voltage issues are usually battery related. Typically you will get 8-10 years on a battery before its toast. Check the charging voltage and also do a CCA test on the battery to see what its capacity is like. Replace as necessary. This should hopefully show the odderties with the wipers.