Another Water Leak! (but Different)

[Guest TaxiBill]

Hi everyone

 

I'm new here, just found this site. Wondering if anyone has come across this problem.....

 

I have a Citroen C5 with water leaking from the expansion tank under the cap. I have changed the thermostat, also put in a new cap. When the water boils it leaks about a litre of water per 100 miles, from under the cap. Temperature guage in the car stays normal, but after 100 miles the computer says to top up water coolant level.

 

Any ideas as to what it might be? No other leaks anywhere.

 

(engine is a 2.2 Peugeot, diesel)

 

Thanks for any thoughts! :-)

[techbod]

it sounds like a water pressure problem ensure the fan cuts in and the air in the car is hot if not then suspect air in the cooling system

[coastline taxis]

it sounds like a water pressure problem ensure the fan cuts in and the air in the car is hot if not then suspect air in the cooling system

Hi have you had anything done to the cooling system recently or drained it to put any antifreeze or summer coolant in as c5 have to be bled properly. is it using any oil and whats the milage on it

[coastline taxis]

Hi have you had anything done to the cooling system recently or drained it to put any antifreeze or summer coolant in as c5 have to be bled properly. is it using any oil and whats the milage on it

Just notice that youve changed thermostat how did you bleed the system as they have to be done properly

top system up with water Then go to where the heater hose goes through through the bulkhead to the matrix youl see a bleed screw open it till all water comes out. then go to the top hose that comes from the radiator in that order then open that the bleed screw till water comes out. Now start engine up and let it run wait until the cooling fan has done 3 cycles (switched on and off ) then open the bleed screw on the top radiator hose a little bit to let any air out once its all water coming out close it. NEVER NEVER OPEN THE MATRIX ONE AS ITL BLOW ALL OVER WHEN HOT

[Guest TaxiBill]

Just notice that youve changed thermostat how did you bleed the system as they have to be done properly

top system up with water Then go to where the heater hose goes through through the bulkhead to the matrix youl see a bleed screw open it till all water comes out. then go to the top hose that comes from the radiator in that order then open that the bleed screw till water comes out. Now start engine up and let it run wait until the cooling fan has done 3 cycles (switched on and off ) then open the bleed screw on the top radiator hose a little bit to let any air out once its all water coming out close it. NEVER NEVER OPEN THE MATRIX ONE AS ITL BLOW ALL OVER WHEN HOT

 

Techbod and Coastline Taxi's, thanks very much for your posts! I've been tied up with decorating the last day or so, but i am going to make the checks you've suggested tomorrow.

 

I don't usually post on forums, so i will keep this brief, not used to it...lol....but thanks again and i will report back.

[stringman]

Hi all

 

I also have a leak in the cooling system.

I have regularly been topping up the system and, until I read this great forum, had no clue about bleeding the system.

does it sound likely that i have air in the system?

 

also i have looked at the previous post and then looked in my engine bay 2.2 hdi sx auto estate

but cant, for the life of me, fathom out where these bleeding bleed screws are.

 

Can anyone offer me any help or (dare I say Pics)

 

many many thanks in advance

 

Andy

[techbod]

I cant help there because the C5 is newer than my software but as a guide to bleeding you always look for the highest point in the cooling system and that's not the expansion tank even though it is higher so we are looking at a pressure thing and normally found where the thermostat housing is

[coastline taxis]

Hi all

 

I also have a leak in the cooling system.

I have regularly been topping up the system and, until I read this great forum, had no clue about bleeding the system.

does it sound likely that i have air in the system?

 

also i have looked at the previous post and then looked in my engine bay 2.2 hdi sx auto estate

but cant, for the life of me, fathom out where these bleeding bleed screws are.

 

Can anyone offer me any help or (dare I say Pics)

 

many many thanks in advance

 

Andy

hi if you look at the back of the engine where it mates with the gearbox you will see 2 black rubber pipes going toward the bulkhead of the car(towards the dashboard) where they disapear into the bulkhead the left hand side one has what appears to be a dust cap on it. unscrew this till its just water comming out then retighten. making sure that the header tank is kept full all the time Next one is on the top hose that comes from the radiator and goes to the thermostate this one just looks like a black plastic screw in the pipe again slacken till just water then tighten' now check water level is up to max and replace the cap fire engine up and allow to idle till the cooling fan has cut in and out 3 times. then slacken the bleed screw on radiator hose and any air left in system will come out. never never never open the back bleeder on a hot engine system is now bled

[stringman]

hi if you look at the back of the engine where it mates with the gearbox you will see 2 black rubber pipes going toward the bulkhead of the car(towards the dashboard) where they disapear into the bulkhead the left hand side one has what appears to be a dust cap on it. unscrew this till its just water comming out then retighten. making sure that the header tank is kept full all the time Next one is on the top hose that comes from the radiator and goes to the thermostate this one just looks like a black plastic screw in the pipe again slacken till just water then tighten' now check water level is up to max and replace the cap fire engine up and allow to idle till the cooling fan has cut in and out 3 times. then slacken the bleed screw on radiator hose and any air left in system will come out. never never never open the back bleeder on a hot engine system is now bled

 

 

Thanks very much for that. Can I confirm a few things please

the two black hoses that go through the bulkhead, are they on the left or right of the engine? top or bottom?

 

the radiator hose- is this the top one onthe left hnd side of the rad? it has a large cap wih a cross on it (could be a large bleed screw)

 

sorry for being so thick

 

 

thanks

[coastline taxis]

Thanks very much for that. Can I confirm a few things please

the two black hoses that go through the bulkhead, are they on the left or right of the engine? top or bottom?

 

the radiator hose- is this the top one onthe left hnd side of the rad? it has a large cap wih a cross on it (could be a large bleed screw)

 

sorry for being so thick

thanks

If you stand in front of the engine youve got the alternator on your left now look to the right of the coil pack and youl see two rubber hoses comming from the thermostat going toward the bulk head on the left hand hose at the elbow where it goes into heater matrix youl see the bleed nipple. and the rad hose bleed nipple the one youve described. Might i suggest you let car stand overnight then open these screws when engine is cold so your a bit familiar with them as when hot its a high pressure system that could scald you badly. Then once your confident with them do it when hot

[stringman]

If you stand in front of the engine youve got the alternator on your left now look to the right of the coil pack and youl see two rubber hoses comming from the thermostat going toward the bulk head on the left hand hose at the elbow where it goes into heater matrix youl see the bleed nipple. and the rad hose bleed nipple the one youve described. Might i suggest you let car stand overnight then open these screws when engine is cold so your a bit familiar with them as when hot its a high pressure system that could scald you badly. Then once your confident with them do it when hot

[stringman]

If you stand in front of the engine youve got the alternator on your left now look to the right of the coil pack and youl see two rubber hoses comming from the thermostat going toward the bulk head on the left hand hose at the elbow where it goes into heater matrix youl see the bleed nipple. and the rad hose bleed nipple the one youve described. Might i suggest you let car stand overnight then open these screws when engine is cold so your a bit familiar with them as when hot its a high pressure system that could scald you badly. Then once your confident with them do it when hot

[stringman]

thanks for that

I had a look at the engine (before I read your post)

I found a blue covered bleed cap to the right of the engine ( had to take the plastic engine cover off to gain access)

also found a dust cap thing on a pipe down at the bottom unscrewed that and it wa a valve like a tyre valve. pressed that and then realised that i really should leave it to the experts ( or at least get a manual!!!)

 

thanks

 

andy