BMW 316i SE is blowing cold air.?

stevel

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The heater is at 32 deg full on - when i first crank the fan up for a second or so there is a little warm air. People have told me it could be the thermostat but i went to a cheap garage and they advised me to bypass the water valve and this should just through out hot air and if it doesnt it must be an electrical prob?..I did this and still the same. Now the car when sitting running for about 20mins is overheating into the red. Can anyone throw some light on this problem for me?

Many Thanx
 
1 thermostate
2 flush heater core
3 check heater core valve
4 check blend doors
 
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