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Mixing 7.1 and 11s pentosin, and flushing out my mistake
Thanks to Peter, Phil, and others regarding fluid leaks around the bomb on
my car. Today I discoverd a major leak from the front part of the high
pressure hose connecting the hydraulic pump and the rack. Both the pump and
rack appear fine. Before I tested for leaks, I topped up the reservoir with
about 1/4 to 1/3 of a can of Pentosin 7.1--the old stuff. I called
Europarts for the hose (not cheap) and a can or so of Pentosin. He reminded
me that '90 and later Audis are supposed to use the synthetic pentosin, and
it's a bozo no-no to mix them. Later today I found out at one of the
moreless local Audi dealers that they ONLY stock one pentosin. Of course,
they could give no more particulars than that. I looked at the plastic
container and, sure enough, it's 11s. My car, '91 200QW had the hydraulic
pump replaced in June '97 at Graham Automotive, the Audi dealer in Sioux
Falls, SD. I called them a while back and they gave me the impressive that
they'd put 7.1 in it, but they didn't say that. They said they used the
same stuff they've been using.
I suspect I've now mixed two types of Pentosin, and will need to purge the
system. I know there's a fair amount of expertise out there on this.
What's the most efficient (quick and dirty) method for getting rid of what's
in there now. I have not driven the car since topping off the reservoir,
and have only run it at idle for a few minutes. Does it make sense to pull
the high pressure line at the rack, start the car, and let the pump force
out the fluid? Will this do the trick? Or should I purge it from the
reservoir? I'm sure there have been postings on this, and I apologize if
I'm bringing up something that's been covered ad nauseum, but I'm taking the
car on a trip on Friday, and would like to get this resolved.
Much obliged in advance.
- Jim