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Thread: Overheating Gu 4.5L

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    Overheating Gu 4.5L

    Hi Guys,

    Just bought a 1999 Gu last week and had it at the shop one day later to let it check and they said everything was fine. Today it overheated during a maybe 30 Minute drive. I got home before it reached the H but there was steam coming out around the area around the radiator cap. I left the car for cooling and had a look an hour later. The coolant was nearly empty and there was some of it in the engine room. I refilled the coolant in the reservoir and took the car for a short drive, overheated again. I again let it cool down and then opened the radiator cap and started the engine. There was no coolant in the radiator when I looked where the radiator cap normally sits it only came steam out of it after a few minutes. Any suggestions what it should do? Did I made a fault by refilling?

    Thanks for any help.
    Thilo

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    Legendary jay see's Avatar
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    Start with the cheapest first.

    Go back to the shop and get them to pressure test it.

    If you a bit handy on the tools, I'll be taking the radiator out and give it a good flush and clean, refill with water, replace thermostat and radiator cap. If all good then dump the water and fill with coolant.

    If that's not the problem you could have more serious issues.
    Last edited by jay see; 11th February 2017 at 10:21 PM.
    12/97 GEE YOU
    4.5lt Gas blower. Lots of mods to come.....all in good time.

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    Thanks for reply. That's my plans for Monday but would be good if I could try something tomorrow. I usually try to do most things by myself but it's the first Patrol and the first radiator issue so I'm not to sure what to do. Could the problem be that I only filled up the reservoir and not the radiator itself? Because I think the coolant isn't moving around and can't get from the reservoir into the radiator.

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    Legendary jay see's Avatar
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    Don't think so, the problem was already there. If you want to do something, try filling the radiator up. Park it on the driveway so the front of the car is higher. Start engine, turn on heater and fill. Wait about 10 minutes for all the air to escape, then put on cap.
    I'll let it idle for another 1/2 hour. If still good go for a spin a see what it does.
    12/97 GEE YOU
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    Legendary jay see's Avatar
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    Might wanna pop over to the intros and say a formal hello to everyone as well.
    12/97 GEE YOU
    4.5lt Gas blower. Lots of mods to come.....all in good time.

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    So if there comes steam out of the radiator cap hole its only air which leaves the system? I'm a bit afraid of destroying anything while let it run without a running cooling system or is it okay as long as the temperature isn't high?

    I will say hello to all in a second

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    Patrol God threedogs's Avatar
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    Cut the bottom out of a coke bottle and tape that to your radiator.
    This will lift your fill point so any air can escape you may need to
    "burp" it. Let it come to temp then see how it goes.
    As suggested by others remove and clean the radiator you'll probale
    find the bottom is clogged with mud and dust from over the years.
    How is your viscous fan? give it a spin and let us know what happened.?
    Last edited by threedogs; 12th February 2017 at 04:51 PM.
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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    I will try was you said soon but as I tried something I found out that when I press the big hose that runs to the engine I have a slight noise as when air comes out at the back of the plastic in the area left from the radiator cap. So maybe the plastic top of the radiator is cracked. If it's that can I change that only or do I need to replace the whole radiator?

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    Patrol God threedogs's Avatar
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    You can replace the radiator cap as its just a cap the overflow bottle will be a pressure release style
    @Bob will be able to confirm which cap fits where.

    Does your GU have any warranty from who you brought it off.
    Seems funny you buy it and straight away you have problems
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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    No I mean the plastic part on top of the radiator not the radiator cap itself. Unfortunately not, bought it from private. Had it checked in a shop one day later and they said everything is fine but yeah. Can I load up pictures? Did not found that function. Then you maybe see what I mean.

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