Cooling System Bleed Screws 2006 2.0 Hdi Dispatch

[Pratchy]

Hi, I wonder if anyone can tell me where the bleed screws are on the cooling system on a 2.0 hdi 2006 Citroen dispatch? And in what order they should be bled? I have found the one on the thermostat housing, but can't find any others? Anyone??

[paul.h]

Welcome to the forum.

 

Looking at the parts diagrams it appears there is only the bleed screw on the thermostat housing. On other Citroens there is often a second bleed screw on the coolant pipe from the cabin heater matrix at the back of the engine bay. You close the bleed screws separately when coolant starts to come out of each one without any air. The bleed screws can also be opened again once the system is filled in case more air needs removing.

[Pratchy]

Thank you, I am sure you are right, there are no other bleed screws on the hoses that connect to the heater matrix (near bulkhead) or on the radiator. I have bled the system from the thermostat housing screw and run her up to temperature today. This is after changing the thermostat and the temp sender (green one). All seems ok though I'm a little puzzled at the temperature it seems to sit at. I have run the engine until the thermostat opened but the temperature gauge on the instrument cluster is only reading 70-75. Left it ticking over for 45 mins and it climbed no further. Sat in it revving the engine at about 2k for 5-10 mins but still couldn't get it to hit 80, and when returned to tick over soon dropped back to 70-75. I replaced the temp sensor thinking it might not be giving an accurate reading but the gauge still runs the same, also changed the instrument cluster including the temp gauge to eliminate that. Is this low engine temperature normal for these vans?

[paul.h]

Often thermostats have the opening temperature stamped on them and in the parts diagrams they seem to be 83C so you would expect the sensor to be a few degrees higher - maybe the connector pins are a bit dirty giving a bit of resistance which is seen as a cooler engine. If you have access to a code reader that also gives live data you could see what value the sensor is giving rather than relying on the gauge.