pete stewart Posted March 9, 2011 Report Share Posted March 9, 2011 Hi Can anyone explain why my heater doers not work on my car a 3A the control knob on the inside of the car works but no heat within the car. Thanks Pete Quote Link to post Share on other sites
alanh Posted March 9, 2011 Report Share Posted March 9, 2011 is the valve on the back of the cylinder head open? often they are closed for the summer to avoid heating the cabin when not required. alan Quote Link to post Share on other sites
TomMull Posted March 9, 2011 Report Share Posted March 9, 2011 Hi Can anyone explain why my heater doers not work on my car a 3A the control knob on the inside of the car works but no heat within the car. Thanks Pete Pete, Yes, in cold weather it’s a bit hard to tell if they are working. (I once nearly froze a girlfriend when I forgot to open the passenger heater door). Does the blower work –just cold air? If so is the valve on the back of the head open? Are both of the heater hoses hot to the touch? Is the cooling system full and free of air. Hope this helps. Tom Quote Link to post Share on other sites
BrianC Posted March 9, 2011 Report Share Posted March 9, 2011 (edited) If the blower works when the knob on the dash is turned, and air of some sort is pushed out when the heater flaps are opened and the scuttle vent is opened to admit fresh air to the heater matrix, then either the heater tap on the cylinder header is closed or blocked, or the heater hoses and/or heater matrix are blocked. The engine block around the rear two liners is notorious for silting up and you will need to try flushing and back-flushing the system. Lots of advice on how best to do this are already on the Forum, so try searching for 'overheating' or 'cooling'. First try removing both the taps and poking with a bent piece of stiff wire to see if any water is in the area. Then systematically flush each part of the cooling system. Edited March 10, 2011 by BrianC Quote Link to post Share on other sites
ians Posted March 9, 2011 Report Share Posted March 9, 2011 I have found that rather than using a piece of wire you should use a large plastic cable tie. It has the advantage of being able to be temporarily pre bent to get round the first corner and then you can rotate it to act as a flexible reamer! Also remove the drain tap on the side of the block and do the same. Quote Link to post Share on other sites
BrianC Posted March 10, 2011 Report Share Posted March 10, 2011 Quite right Ian - I should have said "...try removing both the taps and poking...". I always use a piece of coat hanger wire with a 90 degree bend about 3/4" from the bottom. Quote Link to post Share on other sites
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