Xantia 1.9 TD Radiator Fans

soupy_sam · Unread post by **soupy_sam** » 29 Sep 2005, 19:00

The Radiator fans are constantly running can you tell me what causes this and how to cure it please

James.UK · Unread post by **James.UK** » 29 Sep 2005, 19:06

Sounds like you have a dead short across the terminals in your radiator sender-sensor..

Unread post by **Peter.N.** » 29 Sep 2005, 20:38

Or the relay.

fastandfurryous · Unread post by **fastandfurryous** » 29 Sep 2005, 20:42

Depends if they are permanently running at full-speed or half-speed. If they are permanently running at half-speed, this is likely to be because you have the air-con on, or possibly there is a fault in the bitron box.

soupy_sam · Unread post by **soupy_sam** » 29 Sep 2005, 20:46

Does not have Air Con, Where is the Relay located?
is there a way of checking the sender sensor

Clogzz · Unread post by **Clogzz** » 29 Sep 2005, 20:58

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by fastandfurryous

Depends if they are permanently running at full-speed or half-speed.
<hr height="1" noshade id="quote"></blockquote id="quote">http://www.andyspares.com/discussionfor ... C_ID=15781

Clogzz · Unread post by **Clogzz** » 29 Sep 2005, 21:01

The main cause of indication of overheat and erratic operation of the fans is an intermittency in the wiring from the brown temperature sensor on the thermostat housing to the Bitron input.
In France, this problem has been the object of a recall, but everywhere else, we're on our own: http://xu10j4r.free.fr/xantia/notexantia.pdf

Clogzz · Unread post by **Clogzz** » 29 Sep 2005, 21:06

Copied from Peugeot site:
Symptoms: The cooling fans keep running indefinitely after the ignition is switched off. The problem disappears for a period of time. Usually the fans ran until the battery went flat. It was also noted that the A/C system and rear screen demister was operable with the ignition off.
Possible Cause: Water in the cooling fan connector. This connector is located on the left side of the cooling fan unit and is accessible from the rear of the front panel. Nearby on the left chassis rail are 2 more connectors that should always be checked in the event of a cooling fan malfunction.
The picture on the left shows the connector from the front with the bumper bar removed. It can be accessed from the back, removal of the bumper bar is not required.

Diagnosis: The first item checked was the A/C main relay in the passenger compartment next to the fuse box. The relay was found to be energised with the ignition switched off. The relay coil is normaly supplied with 12V from the ignition switch via fuse number 5. The ignition switch tested ok, no short circuit to positiv between ignition switch and relay. We isolated the engine bay harness by disconnecting the main connector in the plenum chamber. The relay switched off after that.
On this paricular model, fuse number 5 supplies the hight speed fan relays, the control unit for the cooling fans, the compressor cut- off relay and the pressostat. The water inside the connector short circuited the ignition wire to battery +. This activated the cooling fan relays and also provided feed back to the A/C relay.

Clogzz · Unread post by **Clogzz** » 29 Sep 2005, 21:08

http://www.peugeotlogic.com/workshop/ws ... fanop1.htm
Check the wire and connectors from the brown temperature sender on the thermostat housing going to the Bitron.
If it has bad contacts, the fans will spin flat out.

soupy_sam · Unread post by **soupy_sam** » 29 Sep 2005, 23:42

What is a Bitron unit?

soupy_sam · Unread post by **soupy_sam** » 29 Sep 2005, 23:46

Could an air blockage in the cooling system cause this

Clogzz · Unread post by **Clogzz** » 30 Sep 2005, 17:14

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by soupy_sam

What is a Bitron unit?
<hr height="1" noshade id="quote"></blockquote id="quote">
The Bitron is an electronic box with inputs and outputs that controls the operation of the fans.

Clogzz · Unread post by **Clogzz** » 30 Sep 2005, 17:19

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by soupy_sam

Could an air blockage in the cooling system cause this
<hr height="1" noshade id="quote"></blockquote id="quote">
Yes, and it does happen.
When you fill the cooling system, open the nozzle on the heater hose to let the air out.
It is the highest point of the cooling system, and when the fluid starts to come out of that nozzle, close it.
A few days later, check if the header tank needs more coolant, and add as required.

soupy_sam · Unread post by **soupy_sam** » 02 Oct 2005, 15:04

How do I test all of the various components

soupy_sam · Unread post by **soupy_sam** » 02 Oct 2005, 15:05

Is the Bitron unit on all models or just on Air Con Models