71 LHM Suspension
Citroen XM Internet Reference Version 1.0 105
3/3/99
Hydraurinçage
Folks! Hydraurinçage is made by Total, and is sold in an orange coloured 5liter can. The power steering
on my XM is now 200% of what it used to be.
Important is that you change it for normal LHM again within max. 5000kms. A little bit earlier might be
even better.
Before I put Hydroetcetera in my XM the LHM was BLACK and so where the filters.
I think changing LHM in an XM needs to be done every 40,000 kms at least!
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Pleaides in Cambridgeshire sell a fluid called ’Hydroflush’ for cleaning out LHM systems, which I think is
similar.
I tried it last year, and it seemed to improve things a bit. The instructions just say that you should cycle
the suspension a few times, operate brakes and steering, and then leave it overnight. I drove 100 km or
so with it, but no further - perhaps I should have kept it in for as long as Paul suggests.
Leaks
I put the car up high and gently dab around with a white tissue. Sure enough I get tell tale green stains
and see the odd drip. Where is it comming from – we couldnt find an obvious leak.
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I had a XM LHM leak once which entailed replacing the power steering ram. It was a 1992 model and
the guy in the garage said they often go.
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May be from the upper bearing of the power steering control valve, very slow but not self sealing.
Exercise
Good habit is to regularly do some "hight workout". i.e. with engine running alternate between lowest
and highest position. Your neighbours might think you’re a bit loopy but hey, you ought to be, you have a
citroen :-)
This can clear a clogged hight corrector.
From the CX list
I try it on my CX25GTI (serie 1, 1984, 200000 km). It was magic : my CX now gets up in less than 20
sec. It took before more than 2 minutes to ’wake up’ ... Power steering is softer, no more hydraulic noise
at all when I turn it. Suspension is more better : quicker.
You need to throw away old LHM, clean the 2 filters before, just fill with HydroClean (Hydraurinçage ).
Drive with it for at least about 2000km, even if the notice tells you to keep it only 500km. After 500km,
you will see the first effect of the cleaning.
Keep hydroclean about 2000km as far as you can. You will see, after about 2000km, the chemical
caracteristic of hydroclean changes : strange dynamic reaction of the car like you have unpressurized
sphere suspension. Don’t worry : it is just time to put some new real LHM. Don’t forget to clean again the
2 filters which must be dirty ...
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