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Best thermostat??

This is a discussion on Best thermostat?? within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Demon_Z28 get a stock 185 or a 180 degree thermo, LS1's run better when warmed up. really? ...

  1. #21
    Senior Member M-Ten's Avatar
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    Quote Originally Posted by Demon_Z28 View Post
    get a stock 185 or a 180 degree thermo, LS1's run better when warmed up.
    really? so then why are people getting the aftermarket ones

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    my 05 impala points strait down most of the time and ive had it fixed twice. now that the waranty is out ill put a mechanical guage on it. thats more accurite anyways. at a stand still your fans wont come on until 230 and cut off at 212 factory settings for most gm cars and trucks. a lower thermostat can actualy cause an over heat from not enough time for the water to cool off in the radiator before it goes back into the engine.

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    use the stock one. they are right about the overheating.
    btw, the radiator sensor is just a low coolant indicator...

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    The Demon Demon_Z28's Avatar
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    mine stays at a constant 180 to 189 it never touches 210 only maybe when sitting in traffic... Well my old thermo use to hit 210 all the time, but my new high performance pump and thermostat that came with the pump has kept my engine at optimum running temp.

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    Senior Member M-Ten's Avatar
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    Quote Originally Posted by FORD RECOVERY EXPERT View Post
    use the stock one. they are right about the overheating.
    btw, the radiator sensor is just a low coolant indicator...
    right that's not the one i changed.. but also i think that is messed up too! at random times my low coolant light will come on for a little while and then go off.. even when I had replaced ALL the coolant

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    Quote Originally Posted by 2001NBMZ28 View Post
    Just one sensor. ECT>PCM>gauge.
    Aaahhh, okay thankyou

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by M-Ten View Post
    really? so then why are people getting the aftermarket ones
    A cooler stat allows a more aggressive tune and better octane tollerance. Also with cooler running temps everything else stays cooler such as the air intake setup, which sits in the worst place possible,,,,right on top of the radiator So keeping the inlet air as cool as possible helps as well. Accessories run cooler, the transmission runs cooler, etc...

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by M-Ten View Post
    right that's not the one i changed.. but also i think that is messed up too! at random times my low coolant light will come on for a little while and then go off.. even when I had replaced ALL the coolant
    You might have a guage issue, not sure. But my 02 camaro reads close to the 210 mark. With the stock thermostat the car would run over 200 degrees all the time on the scanner, as hot as 220 alot of the time. And the gauge in the car nearly reflected that, showing 210 or more, sometimes past the middle mark at times. Not accurate by any means but close enough to let me know when things might be wrong.

    When I installed a 160 stat,,,which actually operates in the mid 170's (another story) it tends to keep the car right at the 180 degree mark on the scanner with the fans programmed to start at 185, so the motor never goes above that. The gauge in the dash now reads just slightly below the 210 mark,,,,again without more precise numbers on the gauge, it's hard to tell what the temp is exactly,,,,but it does seem to follow the scanner fairly well.

    My 97 Z does the same thing, gauge seems to follow the scanner to some extent,,,,,,with the stock 195 stat the gauge was up in the middle,,,now that I have a 160 in that car the gauge is very near the bottom and barely moves,,,again the scanner shows this car running in the mid 160 most of the time with fans set to come on at 175 degrees.

    With that said,,,,,it would seem that you do have a gauge problem if your scanner reads 210 degrees and your dash gauge isn't moving much.
    Not sure where to tell you to go from here, maybe a ground????

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    you could probably feel when its over heating. the computer changes the firing order to preserve the engine, but when it gets an acurate reading, so if the sensor and sending unit are bad, i dont think that it will be able to tell. i suggest you take it to an electrical shop. theyll get it going.

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    Quote Originally Posted by M-Ten View Post
    right that's not the one i changed.. but also i think that is messed up too! at random times my low coolant light will come on for a little while and then go off.. even when I had replaced ALL the coolant
    This is a pretty common problem. all 5 of my F-bodies did this at one time or another... had to replace it in every one of em...

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