d9 aircon dead

406silverhdi · Post by **406silverhdi** » Sun Mar 22, 2009 7:30 pm

Hi

My aircon has died

whats the best way to fault find this

whats the common things to go, can i test any of the electrcical sides of it manually

i have replaced my ignition barrell recentley (it was working after i replaced it), dont think its linked but worth mentioning

I tried to manually regas it, the pressure is at the correct level

Post by **Welly** » Mon Mar 23, 2009 7:54 am

The condenser (radiator) at the front is favourite, these fail with reliable accuracy at 7/8 years also check the pipework as it comes up under the battery and also in front of the condenser - check for green oil at the bracket positions.

Oh hang on, you said the pressure is fine.....erm, you could check the wiring to the low pressure switch on top of the condenser left hand side, this can be a bad connection and disables the compressor clutch.

The BSi unit decides whether or not to allow the a/c to run but lets look at other, simpler, stuff first eh?

Some people frigg up a wire to engage the compressor clutch manually (to check it works) but I cannot advise how to actually do this I'm affraid.

puggy · Post by **puggy** » Mon Mar 23, 2009 8:10 am

As welly says check compressor is engaging when you turn on a/c also
check the relay thingy whatever they are called at front of radiator

Post by **Welly** » Mon Mar 23, 2009 8:18 am

it early for you Puggy - have you had your Coco Pops yet?

puggy · Post by **puggy** » Mon Mar 23, 2009 9:12 am

no but just had a piece of lightly toasted wholemeal spread
with marmelade , but thankyou for asking welly

406silverhdi · Post by **406silverhdi** » Mon Mar 23, 2009 9:07 pm

thanks for the replies guys, some things to try when i get a minute

The compressor is not engaging, i tried fiddling with it at the weekend

kebab22 · Post by **kebab22** » Mon Mar 23, 2009 9:43 pm

poss the pressure switch on the side of the aircon rad

406silverhdi · Post by **406silverhdi** » Mon Mar 23, 2009 9:53 pm

kebab22 wrote:poss the pressure switch on the side of the aircon rad

can i bypass it qucikly for a test?

kebab22 · Post by **kebab22** » Tue Mar 24, 2009 7:58 pm

im not sure mate sorry. i think there about £27 from the dealer
i have had loads of probs with my aircon. cost me a small fortune to put right

406silverhdi · Post by **406silverhdi** » Wed Jun 03, 2009 11:33 pm

any other tips?

Post by **teamster1975** » Thu Jun 04, 2009 12:48 pm

If the pressure is good then it's either a wiring fault or compressor/pressure switch/relay.
I've just got mine back from an aircon service, turns out the gas was leaking from the filler valve, the system was completely empty!!
Still, nice icy cold air again

Rog21 · Post by **Rog21** » Fri Jun 05, 2009 2:45 pm

Worth checking your temp gauge is working, the aircon uses this to decide to engage,

If not then temp sender is faulty or plugs under drivers carpet maybe corroded

Rog

406silverhdi · Post by **406silverhdi** » Fri Jun 05, 2009 8:25 pm

where is the aircon temp sensor?

Surely it would be overridden if i just put the aircon on manual rather than auto?

cheers

Rog21 · Post by **Rog21** » Mon Jun 08, 2009 10:17 am

The temp sensor I am talking about is the water temp which is used for the temp gauge on the dash and ECU

Its on the side of the thermostat housing above the gearbox. Removing the airfilter helps to see it

A green sensor with two wires

Roger

406oc.co.uk

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