Xantia cabin heating

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peter306
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Xantia cabin heating

Post by peter306 »

Hi All,
My Xantia cabin heating has decided to stop playing. won't go above blowing ever so slightly warm air. So far i have checked
Both pipes to the matrix are getting hot.
Bled the system, both bleed valves, thermostat housing and heater pipe.
I can hear the stepper motor when i move the temperature slider.
The directional flaps all work.
The ambient/recirculated air flap works.
When i move the temperature slider to cold (blue) i get cold air, as i slide it to the right the air warms a bit then stays the same temperature all the way over to the right (red).
The air temp sensor has a signal, it ranges between 1.96 volts to 2.01 volts.
Cant check the ac computer as i don't have the gear.

So, anyone in the Royal Wootton Bassett area got a Lexia they are willing to put my car on.

Car is a 2000 Xantia 1.8 16 valve

Rgds Pete
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GiveMeABreak
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Re: Xantia cabin heating

Post by GiveMeABreak »

What about the actual matrix itself? It's very possible that the matrix is full of crud and this is limiting circulation and therefore heat dissipation.
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Stickyfinger
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Re: Xantia cabin heating

Post by Stickyfinger »

Is the slider (hot/cold) slightly "Springy" ?
Not unheard that the cables can kink.
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xantia_v6
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Re: Xantia cabin heating

Post by xantia_v6 »

Stickyfinger wrote:
20 Jan 2020, 19:20
Is the slider (hot/cold) slightly "Springy" ?
Not unheard that the cables can kink.
I think that his car has automatic temperature control, so no cable on the temperature selector.

I would advise getting some live data with a Lexia, as it could be a bad reading from one of the temperature sensors.
It would not hurt to change the pollen filter if not done recently.
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Stickyfinger
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Re: Xantia cabin heating

Post by Stickyfinger »

Ahhhh....those modern things :)

?? Is it easy to retro fit the kit ....not that I will :)....I imagine it is a whole new AirBox etc
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Re: Xantia cabin heating

Post by peter306 »

Hello again,
xantia v6 is right, temperature selection is electronic, pollen filter has been done.
I am left with either the cabin temp sensor, the A/C computer or something physical like the flap stuck or the matrix blocked.
that's why i finished with the Lexia request before i start taking more things apart.
Hello Alasdair :)
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Stickyfinger
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Re: Xantia cabin heating

Post by Stickyfinger »

:)
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xantia_v6
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Re: Xantia cabin heating

Post by xantia_v6 »

I think that there is also a temperature sensor on the sir intake and another for the air after the heater matrix. Without diagnostics you are working blind.

Alistair, which system does your car have?, I thought all V6s had automatic temperature and fan control.
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Stickyfinger
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Re: Xantia cabin heating

Post by Stickyfinger »

Mine is Air Con, with cables to heat & intake sliders.
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xantia_v6
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Re: Xantia cabin heating

Post by xantia_v6 »

Stickyfinger wrote:
20 Jan 2020, 22:32
Mine is Air Con, with cables to heat & intake sliders.
I think that yours has 2 mechanical cables, for recirculation and air direction, temperature control being electronic, essentially the same as the system under discussion here (but with an older version of ECU).
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Stickyfinger
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Re: Xantia cabin heating

Post by Stickyfinger »

Ahhh....I did wonder, so 3 systems...
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white exec
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Re: Xantia cabin heating

Post by white exec »

A check with VIN on Parts should show what's there.
peter306
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Re: Xantia cabin heating

Post by peter306 »

Xantia v6, found the other sensor, just after the pollen filter, did you mean the cabin air sensor or another one on the other side of the box.
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Re: Xantia cabin heating

Post by peter306 »

Ignore that, other one is behind the temp control box, bit tight to get out :)
By the way my VIN is VF7**************[VIN obfuscated, can be read by forum staff]
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Re: Xantia cabin heating

Post by peter306 »

got the sensors out, tested and back in, resistance is changing as they are warmed up
Valeo 602588E, cold air in, start cold 8.6 ohms, after 1 minute 6.0 ohms, 5 minutes 4.7 ohms
Valeo 602587D, Warm ! air out, start cold 17.8 ohms, after 1 minute 12.6 ohms, 5 minutes 10.4 ohms
So both working but whether within specs, does anybody know :)
yes, i have PM'd a guy in the area about putting it on a Lexia but haven't heard anything back.

Alasdair are you still doing the Lexia.