I recently replaced my orig. cast impeller WP with a new GMB (smaller dia. BTW) stamped steel impeller WP during a timing belt change. Purposely did not change out the t-stat to run a little experiment. Currently the experiment shows little change in engine tendency to overheat. Engine runs same displayed temp as before, and has not risen during high load, also as before.
I kept the cast impeller WP with the idea to eventually rebuild it w/ new bearing and seal.
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1985 744 gle d24t
1985 745 gle d24t
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