Guest Thumbs Posted February 3, 2016 Share Posted February 3, 2016 I can't seem to get any heat out of my mk4 cab heater, it is warm if you put your hand close to air vents but not enough to warm up the cabin. Water pipes into and out of the heater matrix are hot but the rather wimpy flow of air coming out of the vents is only just warm. Anyone got any idea how to improve things? Quote Link to comment Share on other sites More sharing options...
Stephen Bearded Minky Hill Posted February 4, 2016 Share Posted February 4, 2016 Sounds like the heater matrix is blocked up. Take the two pipes off and attach the garden hose and flush it through. Quote Link to comment Share on other sites More sharing options...
Ian71 Posted February 4, 2016 Share Posted February 4, 2016 Also have you checked your water header tank,if its low needs topping up to the right level. Quote Link to comment Share on other sites More sharing options...
Guest Thumbs Posted March 1, 2016 Share Posted March 1, 2016 Update time. After checking water pipes in and out of the matrix were hot... Ouch! Yes they were both hot lol. I then started poking around inside the car to try an figure out how the heater distribution box works For those who don't know (I didn't know until today) the box behind the stereo which distributes the heat to the various outlets in the cabin is controlled by two cables, these cables are attached to the dials above the stereo. The right hand dial is connected to the lever on the passenger side of the heater box, this lever controls the flaps in the box that distribute the air to the top middle or bottom air outlets. On my car the outer part of the control cable was not connected to the appropriate retaining clip so the flaps were not operating fully (1 fault found) The second cable connected to the left hand dial loops round to the drivers side of the heater box and connects to a lever on the box (which is hidden behind an air duct, you need to stick your head into the footwell to see this lever) this lever operates a flap inside the box that controls whether the air streaming through the box passes around the matrix (cold air) or goes over the matrix (hot air) on my car the clip that connects the control cable to the lever had come off (fault 2) Now I have hot air YAY! But.... I cannot turn the hot air back to cold. So I take out the heater controls to find that the outer part of the control cable is sliding back and forth in and out of the heater control panel. The cable outer should be retained by a plastic clip that pinches 2 fingers together to retain the cable outer, I eventually found this clip snapped in half on the floor of the car so I fasioned a new clip from a piece of aluminium and resolved the 3rd and final fault. Hopefully this will help someone somewhere, but for now I will bask in my lovely warm heated cabby Quote Link to comment Share on other sites More sharing options...
Guest Ben Calverley Posted March 2, 2016 Share Posted March 2, 2016 I'm having the same problem. I just wanna get hot air constantly. I will try find them cables Quote Link to comment Share on other sites More sharing options...
Ian71 Posted March 2, 2016 Share Posted March 2, 2016 Well done ,good info for other peeps. Quote Link to comment Share on other sites More sharing options...
jinks Posted March 2, 2016 Share Posted March 2, 2016 you young ones in the old days every thing was run on cables lol I just read the thread Quote Link to comment Share on other sites More sharing options...
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