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Engine temp fluctuates

1903 Views 0 Replies 1 Participant Last post by  Mark Keller
1991 240 auto trans. Replaced thermostat (IPD Parts) flushed cooling system thoroughly. Engine temp ranges from 25% to 75% of gauge range. Shot exterior temp with temp gun. Lower hose 212* plus, upper hose 180*-190*. Water pump not weeping and sounds fine. I am stumped. Grateful for any suggestions.
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