Xantia heater

Jshodgson · Post by **Jshodgson** » 23 Oct 2005, 09:20

Hi all

now the weather is getting chilly I realise my heater is rather cool when set to the hottest setting. Any ideas?

BernieLugg · Post by **BernieLugg** » 23 Oct 2005, 09:27

The heater matrix may well be gummed up and need flusing or replacing. Are you cerain the heater control is opperating the valve as it should to let hot water into the matrix, sometimes the cables snap/jam.

Use the Search function, as replacing the matrix has been covered in depth before, and i think the controls have also been covered - though are covered in the Haynes book.

Hope that no one has bodged the heater by "bypassing" the water pipes to fix a leaky matrix!

Good Luck

Stempy · Post by **Stempy** » 23 Oct 2005, 10:14

I had a similar problem which turned out to be the a jammed open thermostat, meaning the coolant never actually got hot enough to heat the cabin efficiently.

np · Post by np » 23 Oct 2005, 10:52

I dont know if you have one or not,but do you have a pollen filter?I know that in the summer if these get dirty or clogged the can reduce the efficency/coldness of the a/c.

Post by **Peter.N.** » 23 Oct 2005, 15:31

It could be that the heater needs bleeding, especially if the hoses have been fitted the wrong way round. Disconnect the return pipe, take the filler cap off, run the engine and keep topping the reservoir up until water free from bubles is coming out of the pipe.

caeclyd2 · Post by **caeclyd2** » 23 Oct 2005, 18:39

np wrote:I dont know if you have one or not,but do you have a pollen filter?I know that in the summer if these get dirty or clogged the can reduce the efficency/coldness of the a/c.

Where is the pollen filter located?

citronut · Post by **citronut** » 23 Oct 2005, 18:51

pollen filter is behind the glove box,simple to check,you could also check the coolant level because if its low there wont be enough going up into the matrix,and you dont need to remove heater hoses to bleed the system
regards malcolm

np · Post by np » 23 Oct 2005, 19:11

The pollen filter is under the glovebox.There may be a piece of carpet under there,so remove that,& then on the left hand side will be a plastic cover,held in by 3 screws.Remove the screws & plastic cover & pull out the old filter.I`m not sure if it only fitted to cars with a/c or not.

citronut · Post by **citronut** » 23 Oct 2005, 20:10

the plastic cover slides one way or the other,i think towards the center consel
regards malcolm

Jshodgson · Post by **Jshodgson** » 04 Nov 2005, 22:13

I now realise that the air is warm as opposed to hot at the highest setting. Does this mean anything that hasn't already been mentioned

Post by **Peter.N.** » 04 Nov 2005, 22:20

If the temperature can be varied the flap must be working, so assuming there is some airflow there must be a restriction in the water supply to the matrix.

Clogzz · Post by **Clogzz** » 05 Nov 2005, 12:44

There may be air in the heater, instead of water.
The top heater hose has a bleed screw to let the air out.

Jshodgson · Post by **Jshodgson** » 06 Nov 2005, 18:19

Thanks,

how od I locate the top heater hose? And is the bleed screw one which can be tightened by hand?

Clogzz · Post by **Clogzz** » 07 Nov 2005, 13:13

The hose goes from the thermostat housing into the firewall.
As you look over the engine from the front of the car, it is to the left of the LHM tank, disappearing behind the engine into the firewall.
The hose is over 1 inch thick and is the highest placed hose at the rear of the engine bay, just where you want it to trap air.

The nozzle has a serrated button to turn by hand, and also has a slot in the middle to insert a flat-bladed screwdriver.

There are differences depending on the model and vintage.
It might be an idea to prompt for the opinion of the experts, who know all the variants, even looking the other way.