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[ronnyd]

I had a similar thing last week, topped up coolant with mixture ( GM anti freeze). Noticed next day had pink staining
on oil filter housing. Level dropped slightly but now appears to have stabilized. Perhaps it doesn,t like being topped to
the max level? Also it happened the very day i forgot to turn air con on and the temp gauge went up higher than
normal too. As said seems ok at moment.

[chrisgixer]

Most leaks in the valley end up running down the back of the engine to on top of or around the gear box bell housing and associated area. Any leak, coolant, oil, ATF, if bad enough always seems to reach the two bolts at the base of the gear box when viewed from underneath.
Stat housing sometimes also gives residue down the front of the block, ime.

[symes]

When mine had stains like that on thermostat housing -it was the small pipe to throttle body causing it to collect there--only found it by pressurizing system

[chrisgixer]

When mine had stains like that on thermostat housing -it was the small pipe to throttle body causing it to collect there--only found it by pressurizing system

So would that be a short plenum? 3.2 being long plenum, so sits forward of the valley.

[SMD]

Thanks for all the replies.

Chris, webby, thanks - the description along with the picture is a big help.

Chris, you are spot on. The coolant collected on the bottom bolts of the gearbox but mine was not a big leak. It started off as a drip and is still a few drips.