diesel heater exchange element????

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My Name: MATTHEW LOMAX

Experienced Member
Posts: 45
Joined: Sat Oct 12, 2013 12:01 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Diesel
Mileage: 120000
Trim Level: Rhythm
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Hello i would of put this in diesel engine section as im led to believe by the haynes only the diesels have this secondary heater.
Now the issue arose today on the school run and i was just feeling where the warm air was coming from behind the lower dash passenger side and i caught what i now know as the wiring clamp/cover to the electric heater exchange or as citroen call it the AIR REHEATING RESISTANCE part no 6436a9 and the car started to grumble and moan and chugg so on further investigation the 2nd and 3rd pin on both the element and the plug are quite badly burnt/charred.
now ive had the element out to take a look and the unit itself looks in good condition apart from the connectors being charred.
priced one up on citroen and its £153.05 :o :o :o so i taken a look on ebay and found one for £25.00. so basically before forking out can anyone help me by telling me how to test the unit.
citroen c3 old 53 plate 1.4 hdi lx 118000


Cabin heater on a Citroen C3
Cabin heater on a Citroen C3
the Cabin heater on a Citroen C3 unit circled
the Cabin heater on a Citroen C3 unit circled
Cabin heater on a Citroen C3 has 2nd and 3rd pins charred
Cabin heater on a Citroen C3 has 2nd and 3rd pins charred
Cabin heater on a Citroen C3
Cabin heater on a Citroen C3
Cabin heater on a Citroen C3
Cabin heater on a Citroen C3
User avatar
My Name: C3CAR

Guru
Posts: 2706
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 99 times

Post

MATTHEW LOMAX wrote:can anyone help me by telling me how to test the unit.
I would expect each of the connections to tie up with each of the lengths of metal that run the length of the unit. One extra for an earth. There should be a resistance between each connection and 'earth' (common).

Image

So the test would be for consistent resistance between each heater element connection and the common earth, well that's where I would start ;)
My Name: MATTHEW LOMAX

Experienced Member
Posts: 45
Joined: Sat Oct 12, 2013 12:01 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Diesel
Mileage: 120000
Trim Level: Rhythm
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)

Post

Well its been 2 weeks since the issue, i tested the plug/connector and also tested the heating element cleaned it all up and put it back together.
On doing so discovered that the connector wasn't pushed home correctly. so the only thing i can put it down to is the plug was jiggling about and not contacting the pins properly thus making excessive heat at the pins/plug.
Now we have a blooming warm car. All my wife can say how quick she warms up the cabin now.
so will still be keeping an eye on it but fairly confident its been resolved.
also what puzzled me as there were no securing method for the connector. i.e it doesn't click into place.
User avatar
My Name: C3CAR

Guru
Posts: 2706
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 186 times
Been thanked: 99 times

Post

MATTHEW LOMAX wrote:Well its been 2 weeks since the issue, i tested the plug/connector and also tested the heating element cleaned it all up and put it back together.
On doing so discovered that the connector wasn't pushed home correctly. so the only thing i can put it down to is the plug was jiggling about and not contacting the pins properly thus making excessive heat at the pins/plug.
Now we have a blooming warm car. All my wife can say how quick she warms up the cabin now.
so will still be keeping an eye on it but fairly confident its been resolved.
also what puzzled me as there were no securing method for the connector. i.e it doesn't click into place.
Great news with the warm cabin.

Maybe a blob or more of Hot Melt Glue would help secure the plug to the socket, yet allow removal if necessary :)
User avatar
My Name: C3driver52

Guru
Posts: 1940
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
Has thanked: 114 times
Been thanked: 67 times

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MATTHEW LOMAX wrote:also what puzzled me as there were no securing method for the connector. i.e it doesn't click into place.
I think you are missing the light grey sliding part of the plug.

The slider locks the plug very tightly and needs to be slid back to release the plug from its socket.


Diesel cabin heater plug
Diesel cabin heater plug
The picture shown the plug with its cover missing, but does include the sliding locking part which is light grey in colour.

this is the slider disengaged

remove heater plug cabin heater citroen C3
remove heater plug cabin heater citroen C3


Citroen C3 diesel cabin heater
Citroen C3 diesel cabin heater
Cabin heater on a Citroen C3
Cabin heater on a Citroen C3
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