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Thread: weird cooling problem

  1. 19th November 2009, 09:27 PM #1
    Sprint
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    weird cooling problem

    not a landrover question, but anyway....

    recently gave the cooling system on the falcon a birthday, replaced all the hoses, thermostat and changed the radiator for one i had spare after i found a few dried coolant tracks on the core ends

    now, running at 110, the temp normally sits halfway on the gauge all the time, but since the changes, the gauge reads a couple of degrees cooler untill i've been driving for 20 minutes, rising to the 3/4 mark unless i turn the heater on.....

    the radiator i dropped in is an adrad rebuild of unknown vintage with about a dozen of the tubes crimped and soldered off, which would explain the higher temperatures, but whats got me stumped is:

    1: why the sudden rise afer 20 minutes
    2: as soon as i drop down from highway speeds getting into town, the temp will drop approx 10 degrees in 2-3 minutes.....
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  2. 19th November 2009, 09:35 PM #2
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    your making more heat than the existing radiator can deal with and you may also have a dodgy thermostat.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  3. 19th November 2009, 09:43 PM #3
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    i figured out the underachieving radiator thing, but its just wierd how it does it pretty much on cue, temp goes up give or take a couple of k's, and how the temp goes down as soon as i get into town and drop down from highway speeds.....
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  4. 20th November 2009, 12:59 AM #4
    forget
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    radiator probably need a good fush,rip it out and take it to the rad shop and have them rod it for you maybe.
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  5. 20th November 2009, 05:31 AM #5
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    not really, its repeatable so thats good

    it takes X amount of heat for y time to generate enough heat to warm everything up to the point where the radiator looses the battle.

    if you ease up on the power levels (ie slow down) you make less heat so the radiator has a chance to offload what it couldnt before if you turn on the heater you're pulling extra heat out of the system.

    give it the beans and it'll warm up faster
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  6. 20th November 2009, 06:49 AM #6
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    just concerns me a little that more or less in the time it takes me to coast down to 60 from 110, it'll drop ~5deg......

    should add that i've got a new 3 core rad here waiting to go in on sat afternoon (once its cooled down from coming home from work lol) im just concerned there might be a problem that would be masked by fitting the new radiator.....
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  7. 20th November 2009, 10:03 AM #7
    mike 90 RR Guest
    ..... Just install the new radiator .....
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  8. 20th November 2009, 08:57 PM #8
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    Quote Originally Posted by mike 90 RR View Post
    ..... Just install the new radiator .....
    which, if there are pre-existing parts, will simply mask the problem untill something fails.....
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  9. 20th November 2009, 09:25 PM #9
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    so do all the normal checks

    pressure test it cold
    pressure test it hot
    check the flow rate
    check the thermostat opening temperature
    check it for bubbles

    if you only changed one component and the performance changed...........
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  10. 20th November 2009, 09:33 PM #10
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    Quote Originally Posted by Blknight.aus View Post
    pressure test it cold - havent tried it
    pressure test it hot - passed
    check the flow rate - how?
    check the thermostat opening temperature - going by the gauge, the thermostat opens around the same temp as the original one used to
    check it for bubbles - none apparent - did a exhaust gas test too - checked out fine

    if you only changed one component and the performance changed...........
    changed radiator and thermostat..... might get up early and chuck the new radiator in it before work tomorrow.....
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