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I run an electric water pump and turning the pump off during warm up is never something I would try.
The engine block and cylinder heads need to be warmed up as evenly as possible, you want to keep that delta temperature between the heads and block as low as possible or you will be poping head gaskets.
One thing I do is run the pump at lower speed during the winter months for the first few minutes after start up.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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