Two common problems with this heater - thermostat not performing properly (even a few degrees too low opening makes a big difference) and air getting round the core without being heated. It may need pulling to bits and renewing the sealing round the the core and on the flap that diverts air through or around the core. Also it may be adjustment of the heat on/off flap - on mine I have found it necessary to add a spring, but from memory this was to try and stop the hot air rather than the cold air, but same principle applies, the flap not moving full travel, due to stiffness in the cable. Cable probably really needs replacing so it moves freely.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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