Defender heater

Hi All
wonder if anybody can help . On way home from work tonight my Y plate defender 130 heater decided not to work , checked and topped up water level ,heater runs warm for about 30 seconds and gets progresivly colder until its blowing cold air again , switch blower off for a while and it will repeat ,warm getting cold fast.any thoughts apreciated .

wanderer02 said:

Hi All
wonder if anybody can help . On way home from work tonight my Y plate defender 130 heater decided not to work , checked and topped up water level ,heater runs warm for about 30 seconds and gets progresivly colder until its blowing cold air again , switch blower off for a while and it will repeat ,warm getting cold fast.any thoughts apreciated .

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sounds like an air lock in the coolant system. Did you bleed the air out when you topped it up? How much did you have to top it up by?

I'm genuinely surprised heaters work in Landy's at all, the design of it all is terrible, more holes in the heater box than the fookin titanic!

Have you checked the hot/cold flap ( yes there's bound to be a correct word for it somewhere ) in the heater box?, if it's starting warm then going cold it could be moving out of position.

wanderer02 said:

Hi All
wonder if anybody can help . On way home from work tonight my Y plate defender 130 heater decided not to work , checked and topped up water level ,heater runs warm for about 30 seconds and gets progresivly colder until its blowing cold air again , switch blower off for a while and it will repeat ,warm getting cold fast.any thoughts apreciated .

Click to expand...

Hi mate, I had this prob a while back cured by adjusting the cable for the heat control flap and back flushing the heater matrix. It was full o ****. I adjusted it by moving the cotrol slide to full open, then undo the nut that holds the cable to the linkage move linkage by hand ensure it is full open then retighten the nut. Even the Doris says the car gets too warm. It still take 15 mins to blow hot, but it will do it.

may i ask how do you back flush think mine needs it to as its cold