Diagnosing Air Con Faults

alistairhurst · Jun 1, 2013

Hi

If you take a P38 to a specialist Land Rover garage with an air con fault, will they be able to diagnose exactly what is wrong with it or is it a case of suck it and see?

I am buying a P38 where the air con is showing the textbook symbol, yet the car has already had new blend motors, air con rad and pump.

Cheers

Alistair

dogsbody · Jun 1, 2013

Why do you think that it's an air con fault?
Have the faults in the Havac been cleared since the motors were replaced?

alistairhurst · Jun 1, 2013

Not sure, seller got the air con re-gassed in readiness for sale that's when the symbol appeared. What do garages charge for resetting fault codes?

Cheers

wammers · Jun 1, 2013

There maybe a list of logged faults. The Hevac does a check each time it is switched on. If it then displays a book symbol it will be a current fault and should show up as such on diag. If you fitted new blend motors but did not free up the flaps, then i am willing to bet it is something to do with distribution flaps. Distribution motor has a lot more work to do than the other two.

alistairhurst · Jun 1, 2013

Cheers for the replies but the bottom line is what's it going to cost me to find out exactly what is wrong with it?

wammers · Jun 1, 2013

alistairhurst said:
Not sure, seller got the air con re-gassed in readiness for sale that's when the symbol appeared. What do garages charge for resetting fault codes?

Cheers

If that is the case odds on a failed pressure switch.

alistairhurst · Jun 1, 2013

If its the pressure switch is it a DIY repair or more involved?

wammers · Jun 1, 2013

alistairhurst said:
Cheers for the replies but the bottom line is what's it going to cost me to find out exactly what is wrong with it?

If there is someone near you with a Nanocom the price of a pint possibly. Only takes a couple of minutes to read and clear the codes.

wammers · Jun 1, 2013

alistairhurst said:
If its the pressure switch is it a DIY repair or more involved?

If it's pressure switch you would have to evacuate the refrigerant. Unless it's just a bad connection.

Lyndasbottom · Jun 1, 2013

I've got a nanocom in Plymouth that I can plug in to your P38 to have a look. PM me if you want.

Datatek · Jun 2, 2013

alistairhurst said:
Hi

If you take a P38 to a specialist Land Rover garage with an air con fault, will they be able to diagnose exactly what is wrong with it or is it a case of suck it and see?

I am buying a P38 where the air con is showing the textbook symbol, yet the car has already had new blend motors, air con rad and pump.

Cheers

Alistair

Depending on year, the book symbol does not show for most aircon faults.
It's most likely blend motors, sticking distribution flaps are common, eightinavee has a mod involving a self tapping screw that stops the flaps sticking.

gfromleeds · Jun 2, 2013

Anyone near leeds that could read mine?
Every thing seams to work albeit the ac not as cold as it should be, but is cooler than outside air so just needs a refill but dint want to do that till i know i dont need to dismantke any part of it

gfromleeds · Jun 2, 2013

Just been out and had a play with it and found the center vent dosent blow at all dnd the windscreen vent blowes all the time
Blend motor? Which one? Ie..were is it?

speedyyellow · Jun 2, 2013

I think blend motors control temperature and the distribution motor controls which vents operate. Sadly I think the distribution motor is the hardest of all to get at.

wammers · Jun 2, 2013

gfromleeds said:
Just been out and had a play with it and found the center vent dosent blow at all dnd the windscreen vent blowes all the time
Blend motor? Which one? Ie..were is it?

Distribution motor. Top one on R/H side of heater. Make sure the quadrant (white thing with gears on) that it drives is free. It can be removed after removing motor to free it off. Note dot on it that must be lined up in either direction on the two gears it drives. To left looking at it, full travel must line up with dot on back gear, right full travel must line up with dot on front gear. Other flap it drives is easy to engage.

alistairhurst · Jun 5, 2013

Hi Shaun

I picking up my hunk of junk tonight, let me know when convenient for you to hook it up to your Nanocom?

I'm in Plymouth loads so can be any time.

Cheers

Alistair

stjohnsmythe · Jun 5, 2013

wammers said:
Distribution motor. Top one on R/H side of heater. Make sure the quadrant (white thing with gears on) that it drives is free. It can be removed after removing motor to free it off. Note dot on it that must be lined up in either direction on the two gears it drives. To left looking at it, full travel must line up with dot on back gear, right full travel must line up with dot on front gear. Other flap it drives is easy to engage.

I need to do my distribution blend motor as it's knackered too. Still, I've done the o rings so I imagine replacing it should be straightforward enough.

gfromleeds · Jun 5, 2013

Is it posable to get to the distribution flap without removing the dash ie remove the speedo

wammers · Jun 5, 2013

gfromleeds said:
Is it posable to get to the distribution flap without removing the dash ie remove the speedo

You don't need to remove dash. Panel under steering wheel, side panel and instrument cluster gives access and a view. You do have a vent conduit in the way but that can be moved around a bit. Awkward but do able.

gazzab79 · Sep 27, 2013

does the distribution motor need to be replaced or can it be repaired. Mine blows air everywhere apart from the front facia ones.

Diagnosing Air Con Faults

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