HEVAC Book Symbol is back.

Hi,

After my last issue (me not plugging a cable in), my book symbol is back.

Simple question, will getting the fault codes read tell me exactly what is the problem? And what are the problems that it could be?


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Errrr.....could do....it will only tell you what the ECU has picked up on....

Depending on Faultcode Reader you may need to decypher it's meaning using DTC lists, and even then that can be ambiguous to say the least.

i.e.

The Code could throw up Ambient Temperature Sensor Signal out of range

Is the signal out of range because the senser is shot? or the Connector is broken? or the Wiring is damaged? or is the Senser actually there? or is it because the connector to the rear of the HEVAC unit is faulty, not connected, damaged etc.

It could even be because the HEVAC unit is up the swanny and there is nothing wrong with the ATS, it is just the ECU is indicating such....

So a reader will give you a pretty good idea of where to look, but it won't be a substitute for some further investigative work from yourself....

If you can find an independant with TestBook or autologic then it might be a better idea than just a fault code reader - BUT.
I am lucky in that I have a full TestBook T4 system. My car is a 2000 P38. In September during a 2000 mile holiday in Scotland the air/con on my car started to play up. I would select Lo (on both) but no cooled air until the car had done a few miles then woosh it started working. I put this down to the gas getting low and as the engine bay warmed up the gas in the pipes and compressor expanded a bit, due to the warmth, enough to persuade the pressure switch to work! But on getting back home I found the gas was full so it wasn't that!! T4 connected and the fault showing was Evaporator Temperature Sensor fault (would not clear). Had a spare so changed that and all is well so far!
The T4 is very good and gives plenty of other info that may help find the fault. You can see a real time readout of all the sensors and blend motors

Likely to be a sticking blend motor. Testbook or Faultmate will most likely identify the fault.

Thanks guys.

I'm going with a sticky blend motor on the drivers side just under where my leak is......

Just wanted it confirmed.

Cheers!!

Fixed it!

Well it fixed itself.....one morning all clear....

Then I got a Check Airbag which has since cleared.....strange goings on!!


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jamesblake said:

Fixed it!

Well it fixed itself.....one morning all clear....

Then I got a Check Airbag which has since cleared.....strange goings on!!


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Click to expand...

Water leak = wet electrics = strange problems

I second that! Gonna build a garage it'll be cheaper than fixing it!!


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