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wierd cooling problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by POWERMAD, Oct 26, 2001.

  1. POWERMAD

    POWERMAD 1/2 ton status

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    Well it isn't overheating it is the opposite.
    It won't build heat like it should.
    I had a 180 stat in it and going down the road it would only get to 160*
    So I put in a 195* stat thinking that the old one was hung open.
    Now on start up it will go to 195 and then drop to 180 and stay there.
    Yes the gage is reading right I have an infra red heat gun that showed that the gage is correct. (Auto Meter)
    I let it sit at idle when I got home and it took almost 20 minutes get it to 195.
    but as soon as I brought the RPM's up it went back down to 180.
    Not that this is a problem but I have never had a rig that did not run at what the stat was.
    I am begining to wonder if the return for the heater going into the Radiator is letting to much water by-pass.
    But my 2 other rigs both with a 454 are routed this way and they operate at 195.
    Tommorrow before I leave for work I am gonna pinch off the return hose and see if the temp goes up.



    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  2. Itali83

    Itali83 1/2 ton status

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    Well, I have a 195 stat in my truck, and a brand new autometer mechanical guage, and my truck only runs at 185. In the head thats what it reads. I'm thinking that by the time the 185 water gets to the stat, it is now up to 195 and thats why it opens, and the guage only reads 185. I'm just thinking here. maybe I'm wrong, I don't know. But mine DOES NOT go up to 195, then jump down to 185 or so, so maybe you have something different.
    Ben 87 Jimmy
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  3. Burbinator

    Burbinator 1/2 ton status

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    Sounds like you just have a really efficient cooling system. Interesting phenomenom in Phoenix when the temp gets warm outside is the amount of cars on the side of the road with open hoods and billowing steam. I would consider myself blessed!

    The learning curve is a toll road...ride with someone who has already paid!
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  4. Crunchy Metal

    Crunchy Metal Newbie

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    My '88 has the same problem. It'll idle all day in a forest fire and just barely hit 195, and drop down as soon as I move. Good in summer but in New York winters It wont break 150 which sucks for heat. My ice sraper is for the inside of the windshield.
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    My temp is always around 205-215. I do live in Phoenix though. I wouldn't worry about it if its not overheating. Beside, from what I have always heard engines perform better if they are cooler. I wish I had your problem.

    My Chevy isn't broken, its just out of gas.
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    My truck runs nice and cool too. Does it still put out heat? You could always get an aftermarket fan setup that doesn't kick on till like 195 or... I believe Jet makes one that is adjustable.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  7. POWERMAD

    POWERMAD 1/2 ton status

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    Yeah it puts out heat but only after driving for 20 minutes.
    And if the inside is all fogged up then forget it I have to sit for a half hour or so.
    And when I took a little road trip across Eastern WA. it was 110-115 in some spots and the rig was not running cool.
    Flat spots at 65 it running 220 and going up big grades it got up to 250. With a 4 core radiator too.
    So I went out and pinched off the return hose that dumps into the radiator and fired it up.
    10 minutes later it hit 190 then dropped to 180.
    I ran it down the road after that and it fluctuated between 190 and 180 then settled down to 180.
    I stopped and turned around and nailed it banging gears at 4 grand and the temp shot up to 190 then dropped back to 180.
    So I am going to dump the return from the heater core back into the block instead of the radiator.
    My thinking on this is that on start up the entire cooling system is getting heated instead of just the block.
    And afterwards running down the road the coolant doesn't have enough time to stay in the radiator to cool off.
    I can't remember where does the return go to on the block.
    I seem to remember it going to the water pump.
    Both of my other rigs have a 454 and the return goes to the radiator.
    Weird thing is that I don't have any cooling issues with them.




    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  8. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    The smaller feed hose (5/8") goes on top the intake and the larger return hose goes to a fitting on top the water pump. Should have a plug in it right now, you'll need a fitting so you can put the 3/4" hose on it

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  9. POWERMAD

    POWERMAD 1/2 ton status

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    that's what I figgured. Now I just have to find that fitting.
    I have several of them but I can never find what I need when I need it .
    I actualy found a 3/4" bolt to plug off the return on the radiator.
    I know if I go buy the fitting that I will find a half dozen of them when I go searching for something else.

    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  10. CaptCrunch

    CaptCrunch 1/2 ton status

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    Sounds like you got her nailed down [​IMG]. Your garage sounds exactly like my garage... toolbox... toolbox @ work... back shed... storage area... [​IMG] So much stuff... but never seem to have what yuou need or can find it it even if you do have it LOL.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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