Demister Not Working

[HATTON12]

Hi there, I have a citroen c5 06 reg 1800 petrol. the heater no longer puts out any heat,with the result that on a cool morning I can not demist the front screen,it will blow out cold air,any ideas.

RON

[paul.h]

Is the engine warming up as normal on the temperature gauge ?

 

Are the hoses to/from the heater matrix at the bulkhead both getting hot ?

 

If yes to both then it is likely the warm air flap in the heater box is not moving to the hot position. This could be a problem with the flap motor, the flap shaft (it is common for these to break), the controller.

 

This is from the pinned Common Problems topic:

 

10. The air conditioning only gives cold air at one side or does not cool much.

The evaporator matrix cooling the air on the C5 is long and if the amount of refrigerant is low then there will not be enough to cool all the matrix for both sides of the cabin. First step should be a regass then if that does not work and there are no leaks then look at replacing the air flap control motors. A regass may be about £50, a flap new motor about £60. It could also be damage to the air flap shaft motor fitting - see this post http://www.citroen-o...c5-2002-aircon/ . I had to have both C5s regassed when about 7 years old, on the second one there was a printout that showed there was only 93 g of refrigerant left and that 525 g were put back in yet the air con was working and gas could be heard going through the pressure control valve but the air was not cooling much.

 

Also have a look at this topic for a possible fix to a broken heater flap connection http://www.citroen-o...or-air-bag-ecu/

 

Have a look at this topic for alternative ways to fix the broken flap connection by extending the motor spindle using one from another motor or buying a motor already with an extended spindle http://www.citroen-o...ulation-aircon/

 

Have a look at this topic for a case where a new comms 2000 unit fixed the manual air con not working http://www.citroen-o...-manual-aircon/

 

In the May 2015 Car Mechanics magazine there is an excellent article by Rob Marshall where he dismantles a 2004 to 2008 C5 heating system with climate control to replace broken heater flaps (the shaft on one had broken completely and the other was breaking). This involves removing the dash and then the heater unit from the car and then fitting new flaps from a dealer (6480E3 for dual zone and 6480E4 for mono system, both £58.53). There are 63 photos showing all the steps. This topic has some tips on replacing these flaps http://www.citroen-o...-problem/page-0

[HATTON12]

Hi there,many thanks for the info,and yes both pipes are warm so it looks like a garage job.

Is the engine warming up as normal on the temperature gauge ?

 

Are the hoses to/from the heater matrix at the bulkhead both getting hot ?

 

If yes to both then it is likely the warm air flap in the heater box is not moving to the hot position. This could be a problem with the flap motor, the flap shaft (it is common for these to break), the controller.

 

This is from the pinned Common Problems topic:

 

10. The air conditioning only gives cold air at one side or does not cool much.

The evaporator matrix cooling the air on the C5 is long and if the amount of refrigerant is low then there will not be enough to cool all the matrix for both sides of the cabin. First step should be a regass then if that does not work and there are no leaks then look at replacing the air flap control motors. A regass may be about £50, a flap new motor about £60. It could also be damage to the air flap shaft motor fitting - see this post http://www.citroen-o...c5-2002-aircon/ . I had to have both C5s regassed when about 7 years old, on the second one there was a printout that showed there was only 93 g of refrigerant left and that 525 g were put back in yet the air con was working and gas could be heard going through the pressure control valve but the air was not cooling much.

 

Also have a look at this topic for a possible fix to a broken heater flap connection http://www.citroen-o...or-air-bag-ecu/

 

Have a look at this topic for alternative ways to fix the broken flap connection by extending the motor spindle using one from another motor or buying a motor already with an extended spindle http://www.citroen-o...ulation-aircon/

 

Have a look at this topic for a case where a new comms 2000 unit fixed the manual air con not working http://www.citroen-o...-manual-aircon/

 

In the May 2015 Car Mechanics magazine there is an excellent article by Rob Marshall where he dismantles a 2004 to 2008 C5 heating system with climate control to replace broken heater flaps (the shaft on one had broken completely and the other was breaking). This involves removing the dash and then the heater unit from the car and then fitting new flaps from a dealer (6480E3 for dual zone and 6480E4 for mono system, both £58.53). There are 63 photos showing all the steps. This topic has some tips on replacing these flaps http://www.citroen-o...-problem/page-0

[HATTON12]

I can confirm that the heater will only blow cold air,it is just a bit strange that both sides went off together,are the flap motors fused in some way other than the main fuse box?

[paul.h]

Do you have climate control where both sides are temperature controlled separately ?

Are the other flaps that direct the air still working ?

[HATTON12]

Hi there,it has a dual temparature control one for driver and one for pasenger side,

i have tried the directional controls and they seem to work fine,

so it seems that the only thing not working is to change the temparature from cold to hot.

Many thanks

[paul.h]

Have you got the temperature control set up via the radio menu so that both sides are adjusted together, just in case one side has a problem that is preventing the other side working.

 

If you had access to a Lexia you could probably do a diagnostic to find out what is wrong. On one of the C5 sections there is a pinned topic of members able to help others with diagnostics.