Coolant Control Valve JJB-100240
Removed from bulkhead, is just a sliding coolant regulator, or shut off valve, this had no issues, opening or closing. The cabin heater control dial operated smoothly, along with steel control rod (shown)
With various aspects of servicing, maintenance, including driver assisted features and vehicle monitoring. For our 1996 Rover 200 and the 04 ZR 120+
About features, and driver notifications on our MG-Rover Information Pages
The only problem with the cooling system since getting the one owner ZR in 2010 Was having no heat in the cabin, we had replaced the radiator, that was corroded along the bottom edge, probably due to a long term incorrect coolant mix, top and bottom radiator hoses fitted, then a correct fill of 5.5 litres of OAT coolant, but the heater was not throwing much out.
Using a further trial and elimination process, the cabin heater control dial was set to hot position, radiator bottom hose detached and coolant drained off yet again. The first to check were the heater control valve, the cabin heater control dial, and then the heater matrix..
Removed from bulkhead, is just a sliding coolant regulator, or shut off valve, this had no issues, opening or closing. The cabin heater control dial operated smoothly, along with steel control rod (shown)
Next was a possibility of a blocked heater matrix, with a clean tube attached to the inlet pipe, a light blow through test expelled clean and clear coolant same with doing the outlet pipe, no blockage was evident so attention turned to the matrix valve.
The heater matrix valve is basically a SAAB C900 unit usually comes supplied with 4 new coolant hoses attached, these cars are now old, so this was replaced during a more in depth fault finding procedure.
With heater dial still set to the 'hot' position, commenced on the filling procedure, till free flowing coolant emerged from coolant rail, the 8mm bleed bolt fitted back, then a check on coolant level, hoses etc, a fully working heater all year round, is essential.
Information is referenced only to our 1996 Rover 200 and 2004 ZR 120+