Xantia HDI Volume of Coolant

thorter · Post by **thorter** » 19 Aug 2010, 21:38

Does anyone know the proper amount of coolant for a Xantia HDI 110 with aircon? According to the Citroen 2001 Xantia-XM-Synergie book, Revue Technique, and the BOL, it is 8.5 litres without aircon and 11 litres with aircon.

Seems clear enough, but that means an extra half gallon of coolant when there is aircon. Now as far as I can determine the radiator, heater matrix, and engine block are the same with and without aircon, so what would account for 2.5 litres extra? Is it just a mistake, and the correct volume is 8.5 litres for both?

Fred

Toby_HDi · Post by **Toby_HDi** » 19 Aug 2010, 21:43

11 litres is correct.

Unless you're flushing through then you may find it won't take the full 11 litres. Though flushing through isn't a bad idea.

falling-out-with-my-car · Post by **falling-out-with-my-car** » 20 Aug 2010, 02:14

isnt there an extra rad for the air-con?

Toby_HDi · Post by **Toby_HDi** » 20 Aug 2010, 02:37

falling-out-with-my-car wrote:isnt there an extra rad for the air-con?

Yes, also known as the condenser. Don't think any coolant runs through it though. Just relies on air cooling the refrigerant down. Could be wrong though.

Post by **RichardW** » 20 Aug 2010, 07:50

Toby_HDi wrote: Just relies on air cooling the refrigerant down. Could be wrong though.

Yes, you're (almost!) right - the extra radiator just condenses the refrigerant back into liquid and is air cooled only. Not sure where the extra coolant is required when AC is fitted - perhaps the rad itself is bigger?

thorter · Post by **thorter** » 20 Aug 2010, 09:55

Thanks Toby, I'll allow for 11 litres.

Its still not obvious where the extra half gallon is needed. The radiator end connections have minimal volume, and it is only the sump that has clearance for the aircon compressor (hence the reduced oil content).

Fred