what could keep my car from fully warming up?

HISSIN50 said:

The point was that for someone who doesn't want to install a dedicated temp gauge, this is a simple way to get a decent idea of temps (without the risk of getting burned, and while having the system under pressure).

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Maryland Stang said:

Yeah, I know what you were thinking but my fluid drops over 40° across my Granatelli aluminum rad. It's not a very good indicator of what's coming out of the engine.

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HISSIN50 said:

You won't see a differential near that magnitude from the inlet to the cap.

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Maryland Stang said:

Take it up with my radiator. The 195 t-stat opened up and the fluid never got over 160 at the filler.

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