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TBI thermostat

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mattman, Jun 20, 2001.

  1. mattman

    mattman 1/2 ton status

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    Location:
    Austin, Texas
    Does anybody know how low you can go on your thermostat and not mess up the computer? I just replaced my thermostat with the "recommended" 195 degree replacement. Can a 180 degree be used? I know a 160 degree won't work without a custom chip. Just curious, I live in Texas and with the heat and humidity, the ambient can be well over 100 degrees and a little lower would help when stuck in traffic with the AC going. (We got some of the longest redlights and slowest drivers)

    90 GMC Jimmy, 350 TBI, 700R4, 32's
    84 Bronco II 204,000 miles and counting...........that's 206,000 and counting now
     
  2. Twiz

    Twiz 1/2 ton status

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    Location:
    Clearfield Ut.
    A 185 T-stat in 100 deg heat would keep it in closed loop (reading the O2 sensor for adj to the A/F mix)
    But....
    If you run a 180 stat, That suckers going to be wide open most of the time. The coolent will flow threw the radiator too fast, and the radiator will not have enuff time to do it's job.
    With a 195 stat, the flow should be restricted, and flow slower, so the coolant will stay in the radiator longer, and should be cooler going back into the block. Sounds odd, doesn't it, but there was a post a few weeks back the pretty much confirmed it. (in my opinion)

    Thats realy just my theory on it, I might be wrong, but I might be right. The only way to tell is to run both and see what happens. Personaly, I wouldn't even mess with the 185 though.

    Twiztid
     
  3. coopertwpk

    coopertwpk 1/2 ton status

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    The 180/185 work just fine I have one on my 91s10 and my 88K5 the both rarely hit 210 with the a/c on the stock 195s would hit 220 easy so yanked them oh bye the way my 91 s10 has 228,000 mile 4.3 ,700r4 nothing but starters and alternators been replaced and 1 water pump.Also up grade your coil to a msd if you havent replaced it youll need to soon also at or over 100,000m the pickup in the distributor will start to stick

    88k5 silverado w4"lift soon to have <font color=orange>d44 and corp14ff</font color=orange> with 4.56s
     
  4. BillyBob

    BillyBob 1/2 ton status

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    Dumont, NJ
    My truck's temp never goes over the 160 mark on the temp gauge in my 87. And when it does, the truck is usually low on coolant. Maybe something is wrong with my thermostat?

    <A target="_blank" HREF=http://billybob87k5.50megs.com>Homepage of Porky & Stinky</A>
    Billybob, the REAL <font color=red>Bionic Redneck</font color=red>
     
  5. JF 89K5

    JF 89K5 Registered Member

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    I put a 185 degree on my 89 last summer and it runs just fine. I live in south central Idaho and it gets damn hot here at times. With the 185 thrm. I have not gone over 210 yet and thats with the AC on. With my 195 thrm. I would go over 210 all the time.

    Just my experience with it, hope this helps.

    JF
     
  6. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Nothing wrong with a 180. I use them in all my vehicles. Never a cooling problem.
    My .02

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
     

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