How cold is to cold? - Diesel Bombers



Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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Old 03-15-2013, 08:58 PM
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Default How cold is to cold?

I don't know if this is a problem or not.Most of you wish for it.I just rebuilt engine before I rebuilt it always ran 180/185 now with 4in exhaust and duramax fan 155.I figured maybe just cause its been cold here in indiana.First I thought gage since it dont move but I shot it with electronic thermo gun and no matter were you shoot(engine,manifold or exhaust)152 to 158.Today was 62 degrees outside I ran 60 mile an hour for a hour with heater shut off same thing didn't get warm enough to show on gage.this should not hurt any thing should it.
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Old 03-16-2013, 04:25 PM
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For economy and best power you want as close to a constant 200F as you can get.
Sounds like you used aftermarket T-stats that are notorious for not working in these engines.

AC Delco ONLY.
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Old 03-16-2013, 07:05 PM
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Thank you for the info I will replace them tomorrow.
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Old 03-19-2013, 06:03 PM
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Wrong t-Stat every thing good now.Thanks racer 55
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Old 03-19-2013, 06:13 PM
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Good to hear.
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Old 03-19-2013, 06:33 PM
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I should have known better than to get it from O'reilys never had any luck with anything from there except filters.
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Old 03-19-2013, 07:16 PM
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You can get AC/DELCO T-Stats at Oriely's but they have to order them the only part in AC/Delco I havent been able to get there Is my brake switch
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Old 03-19-2013, 08:06 PM
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I probably need to clarify that.The 2 close to me have good parts but don't have employees that no there a-- from a hole in the ground.Dident want to bad mouth hole outlet.

Last edited by Mase; 03-19-2013 at 08:29 PM.
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Old 03-20-2013, 01:06 AM
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My 6.2/6.5 hybrid motor runs around the same temp. I have never even looked at my t-stats the entire I've had my truck. The only time mine runs warmer than that is when I'm towing. I have never gotten double digits in fuel economy. I get between 4-8 MPG. I will definitely change my t-stats when I rebuild it next month.
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