just bought a 71 vw van a beauty but needs a load of work.payed just 300 euro for it a total bargainbut i cant turn the bleedin hetaer off theres hot air pouring out just in front of the windscreeen and by my feet continuously which in valencia in june is the last thing your after could someone let me know how to sort this out as theres no info on the dash as to what is hot or cold and the valve underneath just changes the direction and power of the flow of air it doesnt turn it off