lupy lee Posted March 27, 2008 Report Share Posted March 27, 2008 (edited) Hi there, i am hoping someone will have some ideas for me!!I bought a W reg 1.4 lupo sport 100bhp at the weekend and I got it home and realised that the heaters aren't working properly and blow out cold air. Sometimes i will get hot air blowing out when the revs are high but when the revs are low, cold air blows out even though the temperature gauge says the engine is up to the correct temperature!Have checked the coolant level which appears to be fine and the fan cuts in when the engine gets warm but there does seem to be alot of pressure in the header tank. Would this contribute to the heaters??Does anyone know what the problem could be??? Edited March 27, 2008 by lupy lee Quote Link to comment Share on other sites More sharing options...
Mike_M Posted March 27, 2008 Report Share Posted March 27, 2008 Your heater matrix that is behind the dash on the passengers side sounds like it might be on the way out. Quote Link to comment Share on other sites More sharing options...
Niche Posted March 27, 2008 Report Share Posted March 27, 2008 Either that or the water pump is on its way out. Quote Link to comment Share on other sites More sharing options...
lupy lee Posted March 27, 2008 Author Report Share Posted March 27, 2008 it has had a new waterpump & thermostat fitted iv checked 4 air lock & seems ok il book it in i think dont really want it going pete tong just yet Quote Link to comment Share on other sites More sharing options...
LupoEnvy Posted March 28, 2008 Report Share Posted March 28, 2008 Seen this on another thread (search in this forum 'heater'):"IIRC some water cooled VW's have an emergency 'collapsible valve' in the heater feed pipe from the cylinder head in case the car overheats. Its to stop the heater matrix being overstressed and bursting. If this is the case, replacing this inline valve might cure the problem."Don't know if that helps. Quote Link to comment Share on other sites More sharing options...
lupy lee Posted March 30, 2008 Author Report Share Posted March 30, 2008 Seen this on another thread (search in this forum 'heater'):"IIRC some water cooled VW's have an emergency 'collapsible valve' in the heater feed pipe from the cylinder head in case the car overheats. Its to stop the heater matrix being overstressed and bursting. If this is the case, replacing this inline valve might cure the problem."Don't know if that helps.I took it to the garage and they reckon it is an air lock and are gonna have it in! It is odd as when the revs are hitting 3 ish the heaters blow out hot air but when the revs drop, when i am doing 30mph or when the car is still then it goes back to cold air! I am still not sure!! Quote Link to comment Share on other sites More sharing options...
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