JamesD Posted January 24, 2007 Report Share Posted January 24, 2007 The cold weather has revealed a problem on my 1980 DHC. The heater fan operates but only blows cool or cold air. The only time that warm air appears is when the engine temperature is warm enough to cause the electric fan to operate. Cold air comes back once the fan has lowered the temperature. I read somehere that there may be a water valve in or outside the heater that may have stuck? The temperature control slider moves easily between hot and cold. An unrelated query concerns the fuel guage which has gone from functional to non functional...but not completely. Sometimes, usually when at a standstill, it works, but drive off and the guage does a disappearing act for 90% of the time. It flickers into life from time to time but never when cornering ot braking. I guess this may be an earthing or other electrical fault but it only seems to have started since I connected the car to a trickle charger to keep the battery topped up during the winter. Anyone any bright ideas James Duckworth 1980 DHC V8 Quote Link to post Share on other sites
glsmith83 Posted February 12, 2007 Report Share Posted February 12, 2007 Hi James I have the same problem with my fuel gauge. It normally happens when I have just filled up my car with petrol. It will bounce around all over the place and won't settle down. It eventually stops moving around when the petrol runs down a bit. Not sure why this is though . . . Graeme Quote Link to post Share on other sites
Beans Posted February 12, 2007 Report Share Posted February 12, 2007 The cold weather has revealed a problem on my 1980 DHC ... There is no valve in the heater of a TR7. Heater control is through flaps guiding and regulating air flow through the heater matrix. So if there is no warm/hot air coming out off the vents there are a few options; - Your engine doesn't reach it's optimum temperature (wrong thermostat or a sticking one), - Coolant level is to low, so that air gets trapped in the heater. What (and how) does your temperature gauge read under normal conditions ? Quote Link to post Share on other sites
anthonyt Posted February 13, 2007 Report Share Posted February 13, 2007 The fuel guage problem is likely to be that the float in the tank has filled with fuel and needs replacing Quote Link to post Share on other sites
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