<strong>Yahoo Message Number: 11990</strong>John: I assume that your Coach has the Hydronic Heating system with Two separate Coolant Circuits. So you can put on a Higher Pressure Cap. On earlier posts it was stated that, on 'older models, pre-'02, a low (7 Lb.) pressure cap was because of the Engine Coolant and Hydronic System are All One circuit (a BAD thing for the length of coolant...