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Replaced blown rad but can't get the temp down and water gushes out of top of rad!


SilverMachine

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I recently bought a replacement rad after turning up for work like a steam train the other morning. Once fitted and filled, I ran the car up to temp and took it around the block to release any trapped air in the system. Within a minute I had steam gushing out of the top of the rad. After several hours, I went back to the car, took the cap off the rad and turned the key. The water gushed up and out of the rad like a 6ft fountain. Not sure why this happens now.

I hope I haven't blown the head. No water in the oil. I have changed the thermostat thinking it was cooked.

Any help would be grateful.

Thanks,

Gaz

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Just now, evinX said:

Take the thermostat out and see if its stuck using 1 boiling cup of water and 1 cup of cold water. I THINK tbe hot water will open it and the cold will close it. 

Thanks evinX,

I removed the brand new thermostat from the housing and 'doctored' the old one (took the guts out of it, just leaving the seal) and put this in. Still did the same thing. When I turned the key before, it would idle normally with bubbles and whisps of steam from the top of the rad. Now it's a torrent of water straight up!

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1 minute ago, SilverMachine said:

Thanks evinX,

I removed the brand new thermostat from the housing and 'doctored' the old one (took the guts out of it, just leaving the seal) and put this in. Still did the same thing. When I turned the key before, it would idle normally with bubbles and whisps of steam from the top of the rad. Now it's a torrent of water straight up!

Honestly never heard of those symptoms before mate. Even with head gaskets going. Seems lile somethings blocked...really a scratch head moment this one is. Any ideas through the night and ill post back

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3 minutes ago, evinX said:

Honestly never heard of those symptoms before mate. Even with head gaskets going. Seems lile somethings blocked...really a scratch head moment this one is. Any ideas through the night and ill post back

Thanks. It's got me baffled too, that's why I've come on here to the 'font of knowledge' 😎

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25 minutes ago, evinX said:

If anyone has seen it before its probably Keron, hes the go to man when it comes to...'please help me'

 

Worth giving him a call

Yes he is. Top bloke. Already spoken to him earlier. He says just keep flushing the system 3-4 times to see if this sorts it. Thought I'd see if anyone else on here had a similar issue.

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