Hi all, need some guidance please. The direction control buttons on my heater panel don't work, the heater is stuck on demist mode so only get air to the windscreen. If I press the button to select face or footwell distribution nothing happens, the heater continues to blow the air on the windscreen despite the panel light showing I have selected face/footwell. Does anyone know what the problem could be? If it makes a difference my P38 has the manual heater control panel with rotary knobs to control temperature and fan speed and has no air con. Thank you
P38A Heater problem - stuck on demist
- Thread starter tank93
- Start date
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Datatek
Well-Known Member
- Posts
- 45,080
- Location
- Near Poitiers SW France
The blend motor has failed is the most likely cause. The manual control still uses the blend motors. could just be the distribution flap has become too stiff for the motor to move it.
- Posts
- 12,673
- Location
- Sud ouest France !
Ooer, dashboard diving
- Posts
- 16,579
- Location
- Benfleet, Essex
Another fine piece of LR design is that heating/vent system.Ooer, dashboard diving
Datatek
Well-Known Member
- Posts
- 45,080
- Location
- Near Poitiers SW France
Access is not that easy, the distribution bend motor is on the RH side where there are 2, I can't remember if it's the top one or the bottom one, the drawing does not make it clear.
- Posts
- 4,691
- Location
- Rotherham
Tis the top one
- Posts
- 12,673
- Location
- Sud ouest France !
The number nine on mine is obstructed by a tube that goes to the rear vents... I wish mine was like that one
- Posts
- 3,981
- Location
- Near Heathrow.
Only a small job !!
I am seriously tempted to buy some of these universal cable operated knobs and doing away with the blend motors.
If anyone has a broken manual dial HVAC head unit they want to sell cheap, I'd like to have an experiment with one.
On eBay they are over £100.
Rotary Heater Control knob - Bowden Operated, Heater Valve Cable Switch Kit Car | eBay
Valve Compatibility Will only work with push to close valves. Material High Strength ABS. Other Notes Clockwise rotation pulls wire.
www.ebay.co.uk
On eBay they are over £100.
- Posts
- 12,673
- Location
- Sud ouest France !
Feeling like that right now also I tell you
Datatek
Well-Known Member
- Posts
- 45,080
- Location
- Near Poitiers SW France
I have a good oneI am seriously tempted to buy some of these universal cable operated knobs and doing away with the blend motors.
If anyone has a broken manual dial HVAC head unit they want to sell cheap, I'd like to have an experiment with one.Rotary Heater Control knob - Bowden Operated, Heater Valve Cable Switch Kit Car | eBay
Valve Compatibility Will only work with push to close valves. Material High Strength ABS. Other Notes Clockwise rotation pulls wire.www.ebay.co.uk
On eBay they are over £100.
Flossie
Well-Known Member
- Posts
- 11,072
- Location
- Shropshire
The ducting can be cut through the speedo aperture , i fixed it back using push bike inner tube glued so it was tight to slide up, motors can be got at then. Not done motors myself but a friend has , i cut the ducting to do the matrix seals.
- Posts
- 12,673
- Location
- Sud ouest France !
I'm doing the same on the passenger side
Flossie
Well-Known Member
- Posts
- 11,072
- Location
- Shropshire
I haven't patented the 'acme fasty fix duct repair' yet but I'm seriously considering it.I'm doing the same on the passenger side
Duct tape is soooo yesterday.
- Posts
- 12,673
- Location
- Sud ouest France !
Nah,... Silver Gaffa tape so it can be seen from a good few feet away and the pain suffered doing the bloody job will recognised
- Posts
- 68,532
- Location
- The Wooly Witch
Think of all the things you'll find ...
It'll be like an Indiana Jones adventure ... maybe ...
Is it a job that can be tackled alone or do you need two people to get the dash out? Never attempted anything like this before but willing to give it a go over the next few weeks if the weather improves!! It will probably take me a long time to do because I am no mechanic but hey its got to be done. Is there anything in particular I need to look out for, any real difficult parts of the job or is it pretty straightforward if you take your time? Is there anything else I should be doing whilst the dash, i.e. should I replace the other two blend motors or just the dodgy one? I see lots of posts about heater matrix leaks and o'ring leaks, I don't have those issues (at the moment) so is it better to leave well alone if no leaks or better to replace whilst dash is out? Thanks
jimmacD
Well-Known Member
- Posts
- 381
- Location
- Lincolnshire
I have the same issue on my project P38, lovely hot air on the screen only, seem to remember from my last P38 there was always a "clunk" as the direction motor switched the vents. Not sure if I can be bothered to fix it at the moment, especially as the weather is getting warmer and still have a long list of mechanicals and MOT work? Lots of info on blend motors but nothing on the distribution side. I think my blend motor might be OK if I can change the temp but not direction, so might just be stuck flap?
- Posts
- 3,981
- Location
- Near Heathrow.
Read through this: https://paulp38a.com/range-rover-p38/dash-removal/
