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my heater only blows warm air?

i have just bought a second hand rover impression the heater blows warm air at first then it goes cold and sometimes it blows hot for a little while. and if you put the engine under a bit of pressure it over heats. Any ideas what could be wrong.
Gary, December 2010
aren`t these bad for head gaskets?

cdc, December 2010
link Click here to see other fixes for Rover Impression.