[V6-12v] Car repair by braille (changing hoses)
tomchr at ee.washington.edu
Sun Oct 16 02:56:39 EDT 2005
Changing hoses on a 1994 90S (AAH) is not exactly rocket science. But
I do wish to share a few tips & tricks.
All the original hose clamps have 7 mm hex drives on them. Attach
your trusty 7 mm socket to a suitable handle and go to work.
Make sure you get all the hoses!! My car takes nine (9) hoses total:
1) Bottom of radiator to thermostat and water pipe (3-way hose).
2) Top of radiator to manifold.
3 + 4) Heater core.
5) Oil cooler to front water pipe.
6) Front water pipe to pipe that goes under the battery (on the way
to the expansion tank).
7) Bottom of expansion tank to pipe that goes under battery.
8) Top of expansion tank to radiator.
9) Oil cooler to manifold.
I actually didn't replace 8) as Autohaus AZ didn't have it in stock.
I think that would also require the radiator to be unmounted, which
would be a pain... Should that hose rupture, it's readily accessible
and can be wrapped in duct tape until a suitable replacement can be found.
Now for the tricks:
1) It is possible to remove the heater core hoses without having to
remove the throttle body. It involves a fair amount of "car repair by
braille" but it can be done. You will need to remove the intake
plenum (big plastic ductwork), though. Take care not to loose the two
plastic guide pieces holding the plenum onto the throttle body.
2) The short hose with the bleed screw in it was the biggest pain.
The connection between the hose and the water pipe on the engine can
barely be seen from the top while looking past the cruise control
servo on the driver's side.
3) The lower connection for the longer heater core hose (the one
without the bleed) can be reached from underneath the car. Follow the
exhaust pipe and you'll find it. I used a utility knife to make a
slit in the hose end and just pulled the hose out.
4) You will need to remove the oil cooler to replace its hoses. You
can remove the oil filter without having to drain the engine oil.
You'll loose about a quart of oil when you remove the oil filter, but
that's about it. The 27 mm nut on the oil cooler is to be torqued to
30 Nm (22 ft-lb). If you haven't already replaced the rubber gasket
on the oil cooler, now would be a good time to do so.
5) You can probably help yourself out by removing the driver's side
radiator hose (the upper hose) first, then remove the oil cooler
hose. It'll make life easier to have the bigger hose out of the way.
I didn't do this, and had to attack the oil cooler hoses from below,
which is a pain but can be done.
The remaining hoses are pretty easy. Just take care not to get dirt
and coolant in you eyes when you are working under the car. Wear eye
I used a few short (4") extensions on my 7 mm socket. A longer
extension is also handy. At one point I used a total of about 12-14"
of extension to get to some of the hose clamps. A universal joint
(U-joint) is also mighty handy... Nothing out of the ordinary.
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