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[DynoDave]

Yeah, I've known that stuff was under there, but since it wasn't creating a problem, I decided to leave it be (until now).

[DynoDave]

Great question! I don't know specifically. My guess would be yes, the ECM will know. Even on my OBD1 '88, there is a diverter valve that is ECM controlled....

[DynoDave]

Boy, it's been a bad month for working on the car.

That JET switch was not going to work (wrong diameter), so the search for a suitable (3/8"...

[DynoDave]

Boy, have not been able to find the shop time that I need of late.

Wasn't going to mess with it, but figured since I'm switching the thermostat...

[DynoDave]

Listened to the replay of the Tigers/Yankees game while I pulled the upper rad hose, thermostat housing and thermostat. Nice and clean inside. Adding...

[DynoDave]

A different heater core. It's an original I bought used, and had Superior Radiator test.

[DynoDave]

Strap acid dipped, cleaned, etch primed and painted. Way overkill for a piece that would not rot through in 3 lifetimes, or ever be seen. But I feel better....

[DynoDave]

Removed the heater core from the core support plate and baffle. This spring steel strap is pretty rusty. Soaking it in some acid for a few hours to clean...

[DynoDave]

I wondered why I didn't have to fight with that famously hard-to-get-to 5th fastener. My predecessor took care of that fastener for me.

...

[DynoDave]

The FSM is amazingly lacking in detail. Just do it!

Got the pipe cleaned up. A touch of surface rust under the hose, but still very solid....

[DynoDave]

I tried all of the tools that I had that might reach that clamp behind the cylinder head, but I just could not reach it. Looking online, HF had this tool...thin...