My temperature gauge reads fine, less than half, after warm up and during normal driving. If i drive around to do errands, when i jump back in to start it the gauge reads well past half, but not pinned on hot. As soon as the engine runs a few seconds or i start moving,the gauge comes back down to less than half way. Could this be the sending unit? this problem seemed to coincide with the new heater core i installed. There is plenty of coolant by the way.

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1982 W150 225 SL6 4X4 4 SPD

That is normal-the engine"heats up" when it is off because the water stop circulating. But as soon as it runs it cools down.

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50 chrysler,54 Plymouth, 64 Valiant conv 4 speed, 66 Valiant V8 wagon, 70 Challenger R/T 440+6 conv 4 speed,80 Colt, 98 Neon ACR,84 Honda V45 Magna
Taking care of 57 300C conv,48 T&C conv. Missing my 67 GTX and 36 Ply coupe

To some degree, that's normal heat soak. You could put in an electric fan which would also free up a few HP.

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck

That is normal. I do run an electric fan and 100 plus degree days it may come on more than once after shut off especially on hot black top. It cools down though and hot starts are instant and very explosive....no cranking!

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

it just had me a little concerned b/c it didn't used to do it at all. Thanks all!

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1982 W150 225 SL6 4X4 4 SPD