I may have answered my own question. Should have thought of this earlier, but I will be cleaning off that stain and see if it comes back.
Leaking on top of thermostat housing. 1.8l
So about 8 weeks ago I did a coolant change using the Valvoline Dexcool. Flushed using lots of distilled water
Now there is obvious leaking on top of the housing and from the build up on one spot, to me looks like plastic plug that connects to some pipe or electrical harness which itself goes somewhere behind the engine past the fuel injector rail.
See image...that base of that thing standing in the middle, thicker build up.
![286243]()
In the last week, checking daily I have not observed wet spots. The coolant has dried up earlier and left the brownish red Dexcool ingredients behind. The coolant premixed in the bottle is very strong in red colour.
No coolant smell, ever and the reserviour is half full and has stayed like that for over a month.
Shortly after the coolant change, I added the another dose of a stop leak product that uses Liquid Glass and Kevlar because of coolant dripping after I parked the car, which I added to the previous green coolant also to treat a leak from the water pump. I never noticed dried up green coolant in this area before but maybe it is because it does not stain like the Dexcool does.
If the stop leak fails and the problem returns, do I have to install new thermostat housing or can that vertical plug thing be replaced alone?
Now there is obvious leaking on top of the housing and from the build up on one spot, to me looks like plastic plug that connects to some pipe or electrical harness which itself goes somewhere behind the engine past the fuel injector rail.
See image...that base of that thing standing in the middle, thicker build up.
In the last week, checking daily I have not observed wet spots. The coolant has dried up earlier and left the brownish red Dexcool ingredients behind. The coolant premixed in the bottle is very strong in red colour.
No coolant smell, ever and the reserviour is half full and has stayed like that for over a month.
Shortly after the coolant change, I added the another dose of a stop leak product that uses Liquid Glass and Kevlar because of coolant dripping after I parked the car, which I added to the previous green coolant also to treat a leak from the water pump. I never noticed dried up green coolant in this area before but maybe it is because it does not stain like the Dexcool does.
If the stop leak fails and the problem returns, do I have to install new thermostat housing or can that vertical plug thing be replaced alone?
