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Thread: Thermostat 160 or 195?

  1. #1
    Full Member billk's Avatar
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    Thermostat 160 or 195?

    I am about to leave on an extended trip (1500 miles) and noticed today that my truck has a 160 degree t'stat installed
    Would it not benefit my MPG to change to a 195 degree t'stat?
    The truck is a 88 5.7L C2500 with 148,000 miles.
    I have always believed a hotter coolant temperature improved efficiency?
    T'stats are cheap maybe it would help the mpg?
    Any thoughts?
    Thanks
    Bill

  2. #2
    Senior Member mrjohnwayne's Avatar
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    hmm. from my personal experience with a 160 tstat and a 195 tsat there really wasn't a difference MPG wise. You could always try and see what happens, but I don't think there will be any advantage to it.
    John Wayne

    2000 F-350 7.3L Powerstroke 4x4

  3. #3
    Senior Member 03chevy's Avatar
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    you won't get any better mpg. but the cooler the motor the better. and less likely it will over heat.
    A dirty mind is a terrible thing to waste!

  4. #4
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    bradrhale's Avatar
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    use what the manufacturer put in there. they believe that that temp worked the best.

  5. #5
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    You could go middle of the road and put in a 180 degree thermostat.

    BTW, I have an 87 with the 5.7 L TBI and went from 160 to 180, noticed no change in mileage.
    Dan

  6. #6
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    195 will work best unless your tuned for a cooler stat, hypertech used to sell a 160 "powerstat" and with there tuner it was optimized, from my experience on stock engines 180-195s are key, but with mods an tuning you can go lower and still be effeicient, either way its only a couple of bucks to prove it...
    Gone.

  7. #7
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    you'll need a 195 stat in that truck, and you should see a gain in fuel economy. 160 stat will not allow the motor to go into closed loop very fast, and in open loop the computer runs richer.
    Joe
    89 K2500 Chevy, Wee-Oh-five 294K miles
    1962 Scout 80 parts I guess
    1966 Scout 800 resto job
    2005 Chevy 2500HD Short cab long box DURAMAX
    1996 P30, 6.5 NA Mac Mobile
    whole lot of buicks

  8. #8
    Senior Member gmctrucks's Avatar
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    Truck

    Quote Originally Posted by bradrhale View Post
    use what the manufacturer put in there. they believe that that temp worked the best.
    X 2 he hit right on the head.

  9. #9
    Senior Member smokensteve's Avatar
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    if you have a winter use the 195 and use the cooler 160 in the summer...if you use a 160 in the winter you may not get very much heat ...

  10. #10
    Senior Member Chevy_Finatic79's Avatar
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    for some reason every motor I have ever put in my 85' Chevy truck runs way too hot with a 195* T'stat something like 220* and up. so I bought all the lower temp T'stats and tried them until my operating temp was @ 195* I didnt get to the 195* OP temp until I ran the 160 T'stat which was wierd be cause every motor I put in was running fine in something else with the 195* T'stat
    "She's gonna Freak when she see's my wheels"

    85' Chevy C-10 Longbox (Rat)
    TBI 327 Cu.In./THM350

    90' Chevy Suburban 4x4
    TBI 350 Cu.In./700R4

    http://www.truckforum.org/forums/truck-pictures-176.htm

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