Shaun3632 Posted October 10, 2020 Share Posted October 10, 2020 Has anyone had any issues with heater not getting hot ? I've fitted a new matrix ,heater control valve , thermostat, water pump and hoses , engine gets up to temperature but no heat from heater box Quote Link to comment Share on other sites More sharing options...
Richard B Posted October 10, 2020 Share Posted October 10, 2020 Do the hoses to the heater get hot? If so, I would suspect a blockage in the inlet manifold if a carb car. Try a loop pipe in place of the heater hoses and see if that gets hot? Quote Link to comment Share on other sites More sharing options...
Phil Townsend Posted October 12, 2020 Share Posted October 12, 2020 I get similar issues, due more to the plastic lever having come off the pivot. I have set the valve manually to hot. The hoses and the matrix get hot but only lukewarm air comes out of the vents. I assume that the pivot on the heater box controls a flap internally that stays in a 'cold' position. Can anyone confirm that? Quote Link to comment Share on other sites More sharing options...
RobPearce Posted October 12, 2020 Share Posted October 12, 2020 I believe the saloons (both 2000 family and Dolomite family) use an airbox with a flap to control the temperature, and only shut the valve if you dial in maximum cold. The Herald derivatives are much simpler and the heater control just operates the valve. Quote Link to comment Share on other sites More sharing options...
Phil Townsend Posted October 12, 2020 Share Posted October 12, 2020 Thanks Rob, I thought that was the case. Stripping out to replace carpet soon, I'll look at the heater box then. Quote Link to comment Share on other sites More sharing options...
nang Posted October 20, 2020 Share Posted October 20, 2020 The 1/2" pipe the the hoses connect to has a 1/4" hole where the short tee piece is welded on. It takes little sludge at this point to block circulation. Tony. Quote Link to comment Share on other sites More sharing options...
Phil Townsend Posted October 21, 2020 Share Posted October 21, 2020 The heater radiator can be felt and this is definitely hot. Must be the internal flap in my case. Quote Link to comment Share on other sites More sharing options...
thescrapman Posted October 21, 2020 Share Posted October 21, 2020 Mk1 and Mk2 2000 use a combination of the flap and the water valve to control Temp. valve on a Mk2 is an Achilles heel. Seizes easily. You can be to it fairly easily in drivers footwell. Mk1 valve is under bonnet obviously Quote Link to comment Share on other sites More sharing options...
Phil Townsend Posted October 22, 2020 Share Posted October 22, 2020 I can turn my tap with pliers, so that is ok. Quote Link to comment Share on other sites More sharing options...
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