Land Rover How-To submitted by Land Rover Enthusiast on 30 Jan 2010
HEVAC stands for heating, ventilation, and air conditioning. In Range Rover P38's (4.0/4.6), HEVAC blend motors are electric servos which control the internal vent flap positions to direct hot or cold air where it is needed. John Brabyn's Range Rover site has an excellent how-to article all about what blend motors are, where they are, how to get to them, diagnose problems with them, and get them replaced.
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I think that when you remove the HEVAC unit, one of the 3 connectors disconnected will cause the fan and heater to run and heat without limit. I think that connection could not be sitting properly in its socket. I think this is the problem because once I was removing my HEVAC with the key in the ignition, and as soon as I removed that connector the blowers and Heater went to Max. Check the Connection and ensure its firmly in position.
I own a gold '95 Range Rover P38 HSE 4.6. I run it on LP autogas, which has resolved the large cost of fuel. I kicked out the air suspension and installed coils and shockers. Rides a bit firmer now but without problems/alarms.
One issue I haven't been able to deal with is the climate control (HEVAC.
The main problems are: the air conditioning rarely works although I have been told it is fully gassed. Also quite often when it feels like it, it turns on full heating and I cannot stop this happening except sometimes by turning off the motor and letting the car sit and then when I start it after a few minutes it is again okay, but only sometimes. It is very unpredictable. Now I run with the system turned down and all vents shut which restricts the heat to some degree. When necessary (and when the weather allows)I keep all windows open. Not a good system.
Does anyone have any suggestions to assist me solving this dilemma.
Cheers,
Bryan from Australia
Hi Bryan, i'm from tropical malaysia and the airconditioning on my P38 4.0 works fine after we bypassed the climate control and installed a manual switch.
i've finally decided to switch to coil springs and should i use the British Atlantic set which has an over-ride so that the EAS warnings won't light up like a christmas tree?
merry christmas
Michael Vong
Hi Bryan, I have exactly the same problem with the climate control in my 1999 Range Rover 4.6 HSE and still have not solved the problem. The ECU does not display the manual fault symbol.
Peter,
South Africa
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