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Thread: lower radiator hose is cold

          
   
  1. #1
    Club Guest brgjr123's Avatar
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    lower radiator hose is cold

    Hey guys,

    So Im running an aluminum radiator in my sr. The car says it comes up to temp, but the lower hose is still cold.. I bled the coolant, I put in a new waterpump and nismo thermostat in, and refilled and bled the system when done. When I had the hoses off, I ran water through the radiator fill, and it came out the lower hose, so the radiator doesn't seem to be clogged. When I pulled the water pump and thermostat, the passages seemed clean and unobstructed. I start my car again, and it warms up and water reaches proper temp on my gauge, but he lower hose is still not warm. I can feel that the top hose and top of the radiator is hot, and the middle of the radiator is warm, and the bottom is cold... I'm running stock clutch fan... Is this ok? Doesn't seem normal, doesn't seem like this aluminum radiator can cool the coolant that cold. lol Is the thermostat just opening periodically to barely keep the motor in the perfect temp range?

    thanks,

  2. #2
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    Dude. Its supposed to be cold. That means its working.

    Hot top, Cold bottom

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    Dude. Its supposed to be cold. That means its working.

    Hot top, Cold bottom

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    On Vacation Demasoni's Avatar
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    lol...

  5. #5
    aka jdm_Lucy
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    thats what i thought when i first read the title lol t

  6. #6
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    Cold lower hose? Bad news.

    Replace the water pump. New radiator, Thermostat, rad hoses. Get a front mount while your at it. Three, in fact. and your going to want fans. A LOT of fans. A good half dozen in front of the radiator, a couple surronding the motor, hell your gonna need one for the steering wheel.

    If that dosent work, consider your car totaled.

    Good luck, and Godspeed.

  7. #7
    Club Guest uhothepopo's Avatar
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    =] love this thread.

    Temp check. Also, pull your radiator and do a thorough flush. Check if the new pieces are in working order because it sounds like you replaced everything.

    Edit: IF anything is wrong. If it can sustain a normal operating temp leave it alone.

  8. #8
    Club Guest brgjr123's Avatar
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    i just rebled it and now its better. there was air in the lower hose

  9. #9
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    SR/KA has the little 10mm air bleeder in the upper water neck. Pop that open and fill up.
    What I usually do is hold the clutch fan until the thermostat opens up Best stuff for doing coolant I don't trust the gauges, so do that til the air bubbles burp from the system.

    And Towlie......really?

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    Look at that diagram. Now, the hot water enters in to the radiator (referring to the upper hose, INLET) FROM the engine, then gets through the radiator for COOLING, then exits out the LOWER hose (outlet, to cool the engine) what do you think will happen to the coolant/lower hose? Deedeedee! Of course the lower hose will ALWAYS be cold unless your thermostat won't open, your fans aren't working or you have a bad radiator which results to overheating.
    Last edited by Johannes; 01-12-2011 at 09:33 PM. Reason: Thermostat

  11. #11
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    Quote Originally Posted by Johannes View Post
    Of course the lower hose will ALWAYS be cold unless your fans aren't working or you have a bad radiator which results to overheating.
    How do you know when your thermostat has opened?

  12. #12
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    Quote Originally Posted by Broke_Drifter View Post
    How do you know when your thermostat has opened?
    "when" ? You won't actually know when it will open, but a way to tell if thermostat does not open is if the car is overheating. In his case, the temp. seem to be in normal condition which means his thermostat valve is working.

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    omg... hahaha (:

  14. #14
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    Quote Originally Posted by Johannes View Post
    "when" ? You won't actually know when it will open, but a way to tell if thermostat does not open is if the car is overheating. In his case, the temp. seem to be in normal condition which means his thermostat valve is working.
    So there is no "sure fire" way to tell if it is open?

  15. #15
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    Quote Originally Posted by Broke_Drifter View Post
    So there is no "sure fire" way to tell if it is open?
    You can remove it off of the car, get a pot of water, heat it up, drop it in there and wait for the water to boil. Usually, the thermostat will open before it reaches boiling point. If it doesn't open at all, then you have a bad thermostat.

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