HeVAC issues......help please

Milesg · Feb 5, 2006

Hi chaps and chapesses,

I am the proud new owner of a 1999 S reg DHSE in Epsom with Lightstone, its done over 120k now but is pretty clean.

On the test drive nothing showed, but when I was driving it back I noticed that a book and exclaimation mark had come up on the HeVac. Aaaaahhhhhhhhhhhhhhh!

It all seems to work fine, as it did on the test, the only thing I can think of is that it is showing that the heated seats do not heat, the lights come on but no action. It does not create the book and exlaimation mark when pressed but could it be? If not, what should I be looking out for.

Without pluggin it into a Testbook, is there any other way I can test it?

Help appreciated!

eightinavee · Feb 5, 2006

Hvac is the fussiest system to deal with on LP RR's,Testbook ( or similar ) is pretty much the only way to find out what has upset it.The most common faults are loss of gas from the A/C - which is on unless you press the A/C off button.Leaking condensors or compressor seals generally.Failed blend motors or sticking distribution flaps are another.Heater core temp and evaporator temp sensors can give false or open circuit fault codes.
The only saving grace is that the fault codes are usually quite accurate, ( unlike air suspension ) clear whatever is recorded and see what comes back.Then having the ability to force outputs with Testbook,and watch live data displays usually make it easy enough to find the problem.Fixing it is another matter - blend motors are no problem,sticking distribution flaps are becoming more and more common and can be a pain to fix.( Can mean removal of the dash to do horrible things to the heater box )

Milesg · Feb 5, 2006

eightinavee said:
Hvac is the fussiest system to deal with on LP RR's,Testbook ( or similar ) is pretty much the only way to find out what has upset it.The most common faults are loss of gas from the A/C - which is on unless you press the A/C off button.Leaking condensors or compressor seals generally.Failed blend motors or sticking distribution flaps are another.Heater core temp and evaporator temp sensors can give false or open circuit fault codes.
The only saving grace is that the fault codes are usually quite accurate, ( unlike air suspension ) clear whatever is recorded and see what comes back.Then having the ability to force outputs with Testbook,and watch live data displays usually make it easy enough to find the problem.Fixing it is another matter - blend motors are no problem,sticking distribution flaps are becoming more and more common and can be a pain to fix.( Can mean removal of the dash to do horrible things to the heater box )

Thank you very very much for this prompt reply.

I am going to book it in to have it given the once over in a couple of weeks so will get it all checked out then.

Any ideas on the heated seats?!

martyn gadgetman002 · Feb 5, 2006

i had the same problem. first turn off the a/c with the engine running wait 5 mins if it clears its the a/c sysytem needs checking and maybe regas and leak tested i'm a a/c enginner so it was very simple to test this where are you based as im just about to start doing mobile a/c system test and regasing on cars and four wheel drives

Milesg · Feb 5, 2006

martyn gadgetman002 said:
i had the same problem. first turn off the a/c with the engine running wait 5 mins if it clears its the a/c sysytem needs checking and maybe regas and leak tested i'm a a/c enginner so it was very simple to test this where are you based as im just about to start doing mobile a/c system test and regasing on cars and four wheel drives

Cheers Martyn, I live in Cheltenham, but work in Manchester, Birmingham and MK. Will check this out in the morning. Thanks matey

AVRO · Feb 5, 2006

Milesg said:
Thank you very very much for this prompt reply.

I am going to book it in to have it given the once over in a couple of weeks so will get it all checked out then.

Any ideas on the heated seats?!

Most likely broken heater element on seat cushion, or connector loose under seat. You can check elements by multimeter, if found "open loop", your element (or termostat) is broken.
Connector(s) easily reachable under seat.

Is there some airbags in seats? Just check right connectors.

martyn gadgetman002 · Feb 5, 2006

i'm based in north oxforshire just off the m 40 junction 11 if you need it tested im around tomorrow and have the full workshop manual

Milesg · Feb 5, 2006

martyn gadgetman002 said:
i'm based in north oxforshire just off the m 40 junction 11 if you need it tested im around tomorrow and have the full workshop manual

Thanks for the offer bud but its my Birthday tomorrow and the wife has a day planned, I will be in touch though.

Thanks again.

Miles

HeVAC issues......help please

Milesg

New Member

eightinavee

Well-Known Member

Milesg

New Member

martyn gadgetman002

New Member

Milesg

New Member

AVRO

New Member

martyn gadgetman002

New Member

Milesg

New Member

Similar threads