P38 hevac

First a big thanks to Irishrover you are a star. It is worth explaining here the problem and solution as it is quite obscure until you know why.
Up to 1999 the HEVAC switched the air con clutch directly. After 99 there was a relay in line. SO if you replace a post 99 HEVAC with a second hand pre 99 unit it will try to switch on the air con clutch but its internal current sensing will see relay current instead of full clutch current (2.5 amps). It shows a fault code for clutch circuit s/c or o/c and does not energise the relay for more than a second.
The remedy is simple remove relay 3 and put a wire jumper between the input from the HEVAC to the output to the clutch.
Ok only another 999 problems to go I will get there in the end

:behindsofa:

Pleasure.
Thanks for the update.

mine also is giving me jip
near side fan on constant at full pelt have removed relay to stop this.
all controls do as they should drivers fan responds to speed control.
also no a/c in cabin but shows working under the bonnet.
got book showing on hevac
and advice appreciated
thanks

Swap the relay that you remove with another of the same colour. If the problem disappears, the relay is faulty and needs replacing. The blower relays tend to burn out or the contacts weld together as they handle the high amperage loads of the motors on a regular basis. Also check for signs of burning around the relay pin receptacles on the fuse box board.

thanks irish
i have already tried swaping rl7 with an identical one and checked fuse box inc wireing for burning or corrosion.all was found very clean and in good order.
im trying to locate a rr workshop near me as i dont want to pay for main dealer (pockets not deep enough)and my uncles machine will not read faults.
will see what happens and will update on progress
thanks again

Maybe someone with the Valeo HEVAC diagnostic module may pop up :behindsofa: locally and check the blower motor function, won't take long to check.