The problem

A common problem with Citroens is the heater not working properly.
Vehicles affected include the Citroen C5 Mk III and Xsara Picasso

Owners may experience an intermittent heater blower fan, on one or more of the speed settings, or the fan may not work all, or will only work on full power, or may be stuck on full power.

Two types of controls are used, depending on whether the vehicle has auto air-con or not.
Generally, it is the vehicles without auto air-con (climate control) that have the most common problems with the heater and this is the vehicle we are dealing with here.

The possible causes

There are two common causes of a heater blower fan problem in the Citroen C5 without auto aircon:
Quite frequently, both faults will be present.

A. Faulty Heater Resistor (Otherwise known as the Heater Blower Resistor, Resistor Pack, Heater Rheostat or Blower Motor Resistor, Part No. 6450EP )
Usually, it is the thermal cut-out on it that fails.
Please don't be tempted to re-solder this joint or by-pass it.
This is your safety fuse and protects against potential fires.
Highlighted Thermal trip on Citroen C5 / Xsara Picasso Resistor Pack
An open circuit Heater Resistor Thermal Fuse 

B. Overheated/Burned Heater Resistor Wiring Loom Connector
The connector has a tendency to overheat and damage the loom.
Overheated / burnt  Heater Resistor loom connector
An overheated/burned Heater Resistor Loom Connector

The fixes

A. Faulty Heater Resistor
If it is the resistor has failed, replace the Heater Blower Resistor with new.
This comes complete with a new length of loom.

Citroen C5 Resistor Pack plus loom kit

B. Overheated/Burned Heater Resistor Loom Connector.
Replace the wiring loom connector by fitting a Repair Loom.

Citroen / Peugeot / Zafira B Heater Resistor loom repair tail

C. Other Causes

There can, of course be other causes, like a faulty blower motor, or a blown fuse, but the two main causes above are far and away the most common.

Don't forget to try and determine why the fuse failed in the first place.
usually, its because there has been too much load on the fan motor (or maybe the motor is faulty)
Check that your airways are clear and check/replace the cabin pollen filter.

Replacing the Heater Resistor Loom Connector:
To do this, you need to cut off the old connector, and connect the cables on the new loom kit to the original loom.
For safety, disconnect the battery first and make a note of the radio code.

Eliminate the possibility of making a wiring mistake by cutting and soldering only one cable at a time.


Heater Resistor Pack
Solutions for your vehicle.

Click on one of the links
below for more information
on economical solutions to
Heater Resistor problems
on your vehicle.





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