Phil,

A buddy of my ordered the radiator fitting for me with his order from some place in California but I do see it for the 92 400E in FASTLANE under "COOLING".
...somehow I cannot get the link to transplant correctly...so search for it in FASTLANE under your car and model year as "radiator fitting"

As for changing it this is what I did ( these are not meant to be instructions just an outline of the procedure that I used)

With a COLD engine:

1. Drained radiator by opening red drain "stopper" on the bottom left of the radiator
2. Loosened & drained from lower radiator hose (connects to radiator behind the "stopper" area i.e. on the engine side)
3. Loosened & drained hose from waterpump to radiator.
4. Loosened & drained the hose that goes from this radiator fitting (elbow) to
expansion tank
5. Finally VERY VERY gently tried to pry out the fitting...It broke in half at that
point...then used a very small pair of needlenose pliers to pick out the
rest of the remaining piece(s) of the fitting....lost a couple of tiny (a couple
of millimeter square) plastic fragments into the innards of the radiator but there
was no way to retrieve them. Hopefully, they want gung something up inside.
6. The new fitting pops in (make sure it has a rubber gasket on it...the original
had it and so did the replacement)
7. Then went on to take off the t-stat (this sits in the t-stat housing on the
waterpump and will require taking off a rubber hose that has one bolt that is
somewhat hard to get to ...add filtered tap water, sew it up...drive
the thing around for a while...let it cool, drain again and refill with water...
Did that about three times (with heater on FULL to ensure everything diluted out)
over a weekend.
7. Finally, added a new t-stat back in filled with 50/50 coolant/water mix and the
car has been driven about 700 miles since then without any apparent symptoms of coolant loss.

One could save oneself time by skipping step 6 and actually draining the engine
block through drains that are located near the motor mounts on each
side...I looked at that and decided it was too much trouble for me to get at those and
went the longer route as outlined in step 6.

__________________
Matt
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92 400E 128K
99 GMC YUKON 88K