only blows warmish air on full blast

Hi all Ive recently got a problem that the dial when turned to heat the car only blows warmish air on full blast Ive bled the coolant at the bleed valve under the bonnet and the coolant is well topped up When driving its as if i can hear a sound like rushing water from the passenger side dash (is this the heater matrix?? ) and still am not getting warm air coming through Both the coolant pipes that go into the bulk head are hot to the touch when car has been running as are all the pipes PLEASE HELP!! Winters coming lol

My c3 is a petrol 2002

many thanks in advance for any advice given

legins wrote:Hi all Ive recently got a problem that the dial when turned to heat the car only blows warmish air on full blast Ive bled the coolant at the bleed valve under the bonnet and the coolant is well topped up When driving its as if i can hear a sound like rushing water from the passenger side dash (is this the heater matrix?? )

Hi legins

The heater matrix is directly behind the centre console.

You can't normally hear any water rushing or moving in the cooling system, so I would imagine this is pointing to your problem.

With winter coming and this problem, it would be worth renewing the coolant and refill the system as Citroen suggest, you can fin out about the right coolant and the right way to fill the system here: Citroen C3 Coolant topping up topic.

Flushing out the system my be useful, particularly if the old coolant drained is not the right colour and may clear any blockage in the heater matrix, if there is one.

Flushed out the coolant and replaced with new coolant removed both pipes into heater matrix (bulk head) and used a hose pipe to flush matrix No air locks anywhere but i am only getting warmish air flowing through vents when heater on full

legins wrote:Flushed out the coolant and replaced with new coolant removed both pipes into heater matrix (bulk head) and used a hose pipe to flush matrix No air locks anywhere but i am only getting warmish air flowing through vents when heater on full

Is it a good blast of air, the right amount of air, just the wrong temperature?

Hi yes the fan and vents all work fine but im only getting warm air from vents when heater on full

legins wrote:i can hear a sound like rushing water from the passenger side dash

Hi legins, after your flushing, has the rushing water sound gone?

Do the heater matrix pipes get hot?

What sort of colour was the coolant you drained from the car?

Hi again The coolant was red and replaced with the same Both pipes are hot going into the matrix at bulk head In the passenger footwell just below matrix the pipes there are also hot but the sound of rushing water from the matrix is still there It has to be an airlock but how do i sort as replacing the coolant ive now done 3 times in 2 weeks and ive bled the system at the point on one of the pipes into matrix (dust cap bleed) is there another bleed point im missing

There are some tips on refilling the coolant in a C3 in this topic


It shows the header tank you can use to make a head of coolant:




You may find an additional bleed point on the coolant housing block, its different to the one on the heater matrix pipe.



Part numbered 3. I am not sure if your engine has it, but worth a look.