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AKIS

Member Since: 23 Apr 2009
Location: GREECE
Posts: 186

HEATING PROBLEM WITH NO CURE

Hi to all.Unfo trying to solve heating problems in my TD6 long time now but still nothing and worse is that cannot be found what is going wrong.Problem stands as follows:
Heating is properly working as long as the car is running upto 3000rpm.By the time exceeding this nr of rpm the warm/hot air stops and instead cold air is coming out of the ventilators.
-RR workshop can find nothing as whenever they plugged car the computer has shown not any malfuctions.
As a precaution they have checked the flaps motors which are normally working.
Also changed both temperature and air quality sensors but not any result.

Any ideas what to look for??????

8th Nov 2011 4:39pm

stan
Site Moderator

Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35246

check your coolant level and the coolant temp sensor... ... - .- -.

Y. O. L. O.
.

8th Nov 2011 4:45pm

AKIS

Member Since: 23 Apr 2009
Location: GREECE
Posts: 186

Scarey thanks for your suggestion.Have checked coolant/sensor and seems to be ok.

16th Nov 2011 3:07pm

stan
Site Moderator

Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35246

i dont think you would go over 3000rpm on a normal run, but its worth finding out the reason why though.. ... - .- -.

Y. O. L. O.
.

16th Nov 2011 3:32pm

Rob2529

Member Since: 22 Nov 2010
Location: Wirral, uk
Posts: 1470

Do the TD6's have a blend motor? Could this be the issue? [img]http://www.fuelly.com/driver/rob2529/range-rover[img/]
04, 4.4V8, Vogue Oslo Blue with LPG.
"You can sleep in your car, BUT you can't race your house!!!!"

If something can't be fixed with a hammer....... You have yourself an electrical fault!

16th Nov 2011 9:26pm

rayc

Member Since: 13 Sep 2011
Location: deal, kent
Posts: 105

2007 Range Rover Vogue SE TDV8 Rimini Red

Sounds like it could be a sticky thermostat.

Not closing and therefore all OK whilst engines revving. Loses warmth at low revs. Poss accompanied by using more diesel than usual 08 model TDV8 Vogue SE Rimini Red/ parchment. 04 TD6 Vogue Oslo Blue / parchment
99 Model 2.5 DSE Rioja Red / lightstone
97 BMW M3 Evo Convertible
plus a few more!

16th Nov 2011 10:58pm

stan
Site Moderator

Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35246

OP has problem over 3000 rpm ray... ... - .- -.

Y. O. L. O.
.

17th Nov 2011 8:06am

rayc

Member Since: 13 Sep 2011
Location: deal, kent
Posts: 105

Ha!

That's what happens trying to read it on the iphone without me glasses on!

Water pump? 08 model TDV8 Vogue SE Rimini Red/ parchment. 04 TD6 Vogue Oslo Blue / parchment
99 Model 2.5 DSE Rioja Red / lightstone
97 BMW M3 Evo Convertible
plus a few more!

17th Nov 2011 8:24am

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1345

2015 Range Rover Autobiography SDV8 Aruba

Does it do this even when you have the temp set all the way to 28°C ( Max )

From the RAVE manual:

Quote:
Temperature Control
To determine the amount of heat required, in the form of coolant flow through the heater, the ATC ECU compares the
reference value with the heater matrix temperature and incorporates a correction factor to compensate for changes
of coolant flow rate with engine speed. From the resultant value the ATC ECU determines the open duration of the
coolant valve and outputs the appropriate control signal. On the high line system, separate values and output signals
are generated for each coolant valve to produce the individual temperature control for the LH and RH sides of the
passenger compartment.
When the temperature setting on the control panel is set to maximum, the ATC ECU signals the coolant valve to
remain open. When the temperature setting on the control panel is set to minimum, the ATC ECU signals the coolant
valve to remain closed.
On the high line system, the minimum setting is over-ridden when the defrost programme, maximum A/C, rest heating
or FBH functions are selected.

The hot coolant that reaches the heater matrix is controlled by a valve limiting how much hot coolant actually gets into the heater matrix. It also seems to vary on engine speed. I assume that the higher the engine speed, the more it closes down the valve.

I've known mine to be a bit irregular on occasion due the wiring on the connector to the valve needing a little wiggle to re-seat it. As you stand at the front of the engine bay, the valves are bolted to the right hand side section of the engine bay that holds the suspension strut. On a UK car, it would be down below the ABS unit. You should be able to see the coolant pipes run forward to it and back from it again. Its may be worth checking the connector on the valves. I think cause they are so close to the engine ( on a V8 they are anyway ) the heat can degrade them a bit .

( thinking about it it more... )

I wonder if you have a slightly poor connection ... and that its only opening the valve up half as much as it should do ... if the engine speed increases, the valve gets closed down, but cause you're already half closed to a poor connection, the valve is almost completely shutting off .

Beyond that, you really need to see the readings on a diagnosis computer to see that the system is doing at the rev ranges. V8 or else ...

17th Nov 2011 10:43am

AKIS

Member Since: 23 Apr 2009
Location: GREECE
Posts: 186

Yes even by setting temp to max is doing the same and by the way even when warm air is getting out of vents,at low rpm,temp is not stable,u can easily feel the temp variations higher/lower but atleast is not getting completely cold as when u increasing rpm.

21st Nov 2011 4:11pm

AKIS

Member Since: 23 Apr 2009
Location: GREECE
Posts: 186

Hi to all and back to subject again.Checked valves/connections all ok.I have also changed coolant temp sensor just for being on safe side.Unfo nothing has changed.Still same symptoms/there is hot in only whever car decide to do so.

5th Dec 2011 8:56am

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1345

what about the temp sensor in the cabin itself ... I wonder if its a bit duff. If it doesn't think it needs heat in the cabin, it wont open up the valves.

Maybe a wee hoover of the grill area on the centre console to clear it out? A bit random, but hey, any port in a storm ! V8 or else ...

5th Dec 2011 10:52am

AKIS

Member Since: 23 Apr 2009
Location: GREECE
Posts: 186

Fisha,
Tks for spending some time trying to assist.Just to put u completely in picture
Whenever car is plugged not any damage of malfunction is shown
-Internal temp and air quality sensors hv been changed.
-Coolant valves checked and ok
-Flap motors checked and ok
-Coolant temp sensor changed

Unfo seems that i hv already entered in an endless story

5th Dec 2011 3:22pm

nicedayforit

Member Since: 11 Jun 2011
Location: Beside the Solway
Posts: 3969

2004 Range Rover Vogue Td6 Giverny Green

Could your coolant pump be slowing at high engine speed due to drive belt slippage or even the drive pulley on the coolant pump slipping on the shaft?

5th Dec 2011 3:33pm

Diver Bryn

Member Since: 16 Jan 2012
Location: Durham
Posts: 34

Re: HEATING PROBLEM WITH NO CURE

AKIS wrote:
Hi to all.Unfo trying to solve heating problems in my TD6 long time now but still nothing and worse is that cannot be found what is going wrong.Problem stands as follows:
Heating is properly working as long as the car is running upto 3000rpm.By the time exceeding this nr of rpm the warm/hot air stops and instead cold air is coming out of the ventilators.
-RR workshop can find nothing as whenever they plugged car the computer has shown not any malfuctions.
As a precaution they have checked the flaps motors which are normally working.
Also changed both temperature and air quality sensors but not any result. :blub:

Any ideas what to look for??????

I also have a problem with my heater system in my TD6 2005 Vogue. I have just drained the coolant and topped off and had it bled properly (Heater open and bled three valves after engine hot at Temp 1200hrs) hot air comes out at 50% normal heat, but If I press Feet / Windscreen the tempeture is cold??? Diver Bryn

Previous Transport:
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16th Jan 2012 3:21pm

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