The right thermostat?

Discussion in 'General Chevy & GM Tech Questions' started by erikshunn44, Jul 9, 2009.

  1. erikshunn44

    erikshunn44 New Member

    Hey all,

    Simple question I hope. I'm going to do a coolant flush on the truck and I need to know what temperature thermostat to use. I know its basic...but I am getting conflicting stories on my end on which to use. What (if any) advantages are there to using different temp thermostats? I'm about to make a long haul up to Sequoia, so i need to get this one right.

    It's a 1989 Suburban, 5.7L with less than 100K miles.I've never had any overheating issues in the past, but the coolant is looking pretty gross.


  2. bob13

    bob13 Epic Member 5+ Years 1000 Posts

    Someone more knowledgeable should chime in here but, I always ran a lower temp thermo for vehicles I used for long trips. 160 or so
  3. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Use the thermostat the book calls for. If you use a cooler one your heater will run cooler and in cold conditions your PCM may keep your system in open loop longer resulting in poor gas mileage. Your Powertrain is designed to run at 200+ degrees for optimum engine and emmission performance. jmo
  4. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    x2 what he said

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