DiscoHere Posted October 26, 2009 Share Posted October 26, 2009 Hi Guys. 90 RR P38 heater has suddenly stopped working (no heat) The rest of the car is working well and there is no overheating or other problem with the cooling system. It has been suggested that the problem might be the blend heater pump. Can anyone one shed any light on the subject. Any suggestions as to what may may cause the sudden loss of heat. If the view is blend pump where might i fiind it and what is involved in repairing or replacing it? Regards Hugh Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted October 26, 2009 Share Posted October 26, 2009 You don't have a '90 RR P38', as the P38a wasn't released until very late in 1994 (in the UK). Which engine? You say there is no overheating, but have you actually checked the coolant level in the expansion tank? Air in the heating matrix does limit the heating. There is no such thing as a 'blend heater pump'. In the 38A there are flaps which control the quantity of heated and unheated air that gets blended together, and thus the temperature. These flaps are controlled by blend motors, which are a known failure point, but when these fail you normally get a book and exclamation mark symbol on the screen of the heater control unit. If you do have a 38A, with no warnings in the heater display, and a full cooling system, the problem could be the heater thermostat clipped to one of the pipes leading to the heater matrix. The clips do fail occasionally and the thermostat falls off. In this circumstance the heater control unit does know the coolant is hot, so doesn't draw a lot of heat from the matrix, as it thinks the engine is still warming up. Are there any other problems you know about but haven't mentioned? How long have you had the vehicle? If you have a 38A and want to pinpoint what facilities do and don't work, follow the procedure in this article: http://www.rangie.com/articles/71/1588 HTH Quote Link to comment Share on other sites More sharing options...
paintman Posted October 27, 2009 Share Posted October 27, 2009 This link shows all generations of Range Rover. http://en.wikipedia.org/wiki/Range_Rover#Second_generation_.281994.E2.80.932002.29 The P38 was not on the market until after 1994. Once you establish what you've got the you might get answer that will help you. Quote Link to comment Share on other sites More sharing options...
vougese39 Posted October 27, 2009 Share Posted October 27, 2009 if it is a p38a then it will need to be pluged in and tested to see what is at fault Quote Link to comment Share on other sites More sharing options...
sheltie50 Posted October 27, 2009 Share Posted October 27, 2009 http://www.rangerovers.net/repairdetails/blendmotor.html Have a look at this link it might give some clue, you will need a copy of rave and quite a bit of knowledge if you plan to go in there. As said it needs to be plugged in to be sure of the fault/s Quote Link to comment Share on other sites More sharing options...
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