hi all - still trying to solve the mystery of no heat from heater which given current weather is increasingly important,
have now bled system - have dismantled heater and connected heater matrix to heater pipes separate from heater assembly and eureka - heater matrix does warm up
have been examining heater assembly (pre 94 type) and think I may have found the problem - there are 4 moveable flaps in the heater assembly - one solid one directs the air either to feet/screen or turns off air - seems fine,
second solid one is behind the 2 vents in the middle of the heater (fresh air vents) and simply either opens or closes the airflow to those vents - fine ,
the other 2 flaps are operated by the temperature control lever and one flap is above and one flap is below the heater matrix - both these flaps have 2 large rectangular holes in them and are edged with adhesive foam (like door draught excluder foam ) - to me it seems that with the large holes in each flap - inevitably air goes through the holes as easier to do that than be directed through the heater matrix - my wife's theory is that the holes were originally covered in some kind of mesh so that some air can always pass through the flaps to the fresh air vents which otherwise would be blanked off when these 2 linked heat flaps are forcing air to go through the heater matrix ,
question - please see photos attached -do any of you know if there should be some sort of mesh or screen over these flaps rectangular holes or better still have any photos of yours ?
have searched web and can find no diagrams or photos and currently am tempted to block both flaps rectangular holes so air forced through heater matrix but given the hassle of taking it apart would prefer to do it right once - rather than experiment ,
hope one of you can help
Paul