Question about Chevrolet Silverado 1500

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Condition: says "coolant hot" on display temp gauge wavers from 190 to near red and back to 190 during 30-min drive at 60-73mph temp goes to near red after 1 min running from cold start m oil dipstick reads at hole #3 [the fill line has worn away but there's 4 holes from dip stick tip going up the stick.. #3 hole is about 2 inches up stick added 1/4 gal coolant/water mix -- symptoms persist

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  • paul409 Apr 24, 2009

    i figured coolant cant change temp by 20% in a few minutes or go to hot in 1 min. 1 more reply, please then i'll accept. will be a few days before i can get it fixed, anyway.

    QUESTION: just in case: what's the next likely cause, thanx. BTW - this is great. i'm a busy exec on 100% commission sales so i do this on the fly - great unbiased feedback lets me go straight to the problem without 2nd-guessing the mechanics.

  • paul409 Apr 24, 2009

    yes answer showed all possible problems

  • paul409 Apr 24, 2009

    yes answer showed all possible problems



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Sounds like the thermostat may be getting bad and needs to be replaced. When was the last time this was done? They are generally fairly cheap and can be bought from any autoparts store and I would buy a Chilton or a Haynes manual so you have a diagram and full directions at hand on how to replace it and then if you plan on doing other repairs, you will already have the manual. Let me know if you need anything else. If the problem persists after replacing that, we can see what else may be causing the problem you have but go with the most likely source of the problem first.


Posted on Apr 24, 2009

  • Benjamin Patri
    Benjamin Patri Apr 24, 2009

    There could be a clog somewhere in the radiator. Since it happens at high speeds, then the the fans on the radiator aren't the problem. Also the water pump could be failing. Depending on how many miles are on this car, then you should get both the water pump and the timing belt replaced since they both wear out after so many miles. I would also check the temperature sensor and relay. If you go to Autozone, they can read for error codes for free generally and maybe one will pop up otherwise one of the above suggestions should be the problem but I can't be sure which one, I can only tell you what the most likely problem is. good luck



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