Strange hevac problem

gfromleeds · Dec 19, 2013

Download youself rave and look up the wiring diagram check theres power to the wires that should have it also whilst in there check for contact problems in the plug (corrosion, loose wire ect..)

Rachelkgr · Dec 19, 2013

There are two versions of the HEVAC unit, but that only affects whether an AC relay is required or not, based on year of car and all that.

gfromleeds · Dec 19, 2013

The absolute bottom of the range dont have a lcd display it works by twist knobs and I think it pulls wires to move the flaps

P38crazy · Dec 19, 2013

Cheers i will find it and download it tonight and check the wiring tomorrow cheers for your help

P38crazy · Dec 24, 2013

So I found the wire that was to blame it was the auxiliary power supply one no1 on block c244 so now every think on the hevac works but now my fans still won't work all the blend motors are working because you can hear them justs no actual fans????

Datatek · Dec 24, 2013

P38crazy said:
So I found the wire that was to blame it was the auxiliary power supply one no1 on block c244 so now every think on the hevac works but now my fans still won't work all the blend motors are working because you can hear them justs no actual fans????

Check the fan fuses and relays.

P38crazy · Dec 24, 2013

Datatek said:
Check the fan fuses and relays.

Yeah Iv checked all fuses and relays and there's power at all the fuses an relays

Datatek · Dec 25, 2013

P38crazy said:
Yeah Iv checked all fuses and relays and there's power at all the fuses an relays

Duff fans then or corroded connectors.

gfromleeds · Dec 25, 2013

What was wrong with the power feed?
If it was a duff connection maybe the fan connection is faulty too?

P38crazy · Dec 25, 2013

gfromleeds said:
What was wrong with the power feed?
If it was a duff connection maybe the fan connection is faulty too?

There was just no power feed to that connector for some reason but there was to the other to, the fans work if you put a direct feed to them but there isn't any power getting to them otherwise

Datatek · Dec 26, 2013

P38crazy said:
There was just no power feed to that connector for some reason but there was to the other to, the fans work if you put a direct feed to them but there isn't any power getting to them otherwise

So, it's the HEVAC or the connectors and wiring. Or duff relays/fuse box.

gfromleeds · Dec 26, 2013

If you use all the existing wiring and put power in from the hevac plug?
That would rule out the wireing

P38crazy · Dec 26, 2013

gfromleeds said:
If you use all the existing wiring and put power in from the hevac plug?
That would rule out the wireing

Yeah I will try that tomorrow but I'm unsure which wires to put power to for the fans because I couldn't download rave as I'm on a iPad

Grit Valve · Dec 26, 2013

P38crazy said:
Yeah I will try that tomorrow but I'm unsure which wires to put power to for the fans because I couldn't download rave as I'm on a iPad

Here no need to download on your iPad online version

Land Rover Workshop Manuals > Range Rover P38 > Range Rover Workshop Manual - Eng

P38crazy · Jan 10, 2014

So I've still now luck with my fans I got the hevac to work by putting a direct feed to the auxiliary power supply wire but not the fans I've tried different fans that I no work but my question is the auxiliary power feed from the loom to the hevac is showing minus rather than positive? And so is the blower control output wires? :frown:

Strange hevac problem

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Grit Valve

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