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Author Topic: V6 coolant issue?  (Read 1443 times)

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JamesV6CDX

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V6 coolant issue?
« on: 07 January 2014, 22:12:16 »

My 3.0

Engine is as strong as an ox. Starts/runs brilliant and bags of power

It's not losing coolant as I thought it may be, if it is, it's a tiny loss

This is the issue. Every v6 I've known always has good pressure in the coolant system.

This one, even after a long run, take the header cap off, and not even a hiss, hoses totally soft

Done pressure test, it pressures (but not lots, until the cap hisses) and no leaks visible

Tried new cap on tank, known good from my 2.2

No overheating temp gauge does as it should

Anyone had this or got any ideas?
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chrisgixer

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Re: V6 coolant issue?
« Reply #1 on: 07 January 2014, 22:16:38 »

If it was loosing pressure it would boil over no?

What's the temp gauge doing?
« Last Edit: 07 January 2014, 22:28:31 by chrisgixer »
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Entwood

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Re: V6 coolant issue?
« Reply #2 on: 07 January 2014, 22:19:02 »

check around the neck of the expansion bottle .. not unknown for tiny cracks to occur ... use a soap solution to check for pressure loss ??
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Dan282

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Re: V6 coolant issue?
« Reply #3 on: 07 January 2014, 22:29:11 »

I was think similar, either expansion cap seal or a crack in the filler neck.
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JamesV6CDX

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Re: V6 coolant issue?
« Reply #4 on: 07 January 2014, 22:32:18 »

Temp gauge is fine.

Thanks entwood :y
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chrisgixer

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Re: V6 coolant issue?
« Reply #5 on: 07 January 2014, 22:33:57 »

Temp gauge is fine.

Thanks entwood :y

Oi, where's mine and Dans thank you? ;) ;D
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JamesV6CDX

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Re: V6 coolant issue?
« Reply #6 on: 07 January 2014, 22:38:38 »

Temp gauge is fine.

Thanks entwood :y

Oi, where's mine and Dans thank you? ;) ;D

Sorry :( ;D

I'm pondering your point re boiling over..

What you say is true, but its still not holding pressure ...

:y
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Entwood

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Re: V6 coolant issue?
« Reply #7 on: 07 January 2014, 22:43:39 »

Temp gauge is fine.

Thanks entwood :y

Oi, where's mine and Dans thank you? ;) ;D

Sorry :( ;D

I'm pondering your point re boiling over..

What you say is true, but its still not holding pressure ...

:y

If its running at 85 it won't boil over ...although you may get the odd spot of very hot water/steam in the bowels of the engine due to low pressure....   but will lose a little by evaporation

pressure simply increases the boiling point ...  at 85 you've not yet reached it .. :)
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JamesV6CDX

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Re: V6 coolant issue?
« Reply #8 on: 07 January 2014, 22:54:28 »

If left to idle, temp creeps up to just under 100, fan kicks in, then back to mid way

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chrisgixer

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Re: V6 coolant issue?
« Reply #9 on: 07 January 2014, 23:16:11 »

If left to idle, temp creeps up to just under 100, fan kicks in, then back to mid way



So it would boil over if not for the fans. So its loosing pressure, or sounds likely. :)
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AndyStobbs

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Re: V6 coolant issue?
« Reply #10 on: 08 January 2014, 10:41:00 »

You say you've done a pressure test, are we to take from that, that you've proved it wont hold pressure? But that you cannot find the leak?
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Kevin Wood

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Re: V6 coolant issue?
« Reply #11 on: 08 January 2014, 12:14:29 »

The pressure arises because you have a sealed system where the coolant expands as it heats up. It's getting up to temperature so the only reason for not pressurising will be a leak somewhere. If you're sure there are no coolant leaks anywhere, then the leak must be from the air space at the top of the expansion tank.

The cap would be the first suspect. As this has been substituted, my guess would be that the neck of the tank has cracked, as mentioned, or that the cap is not forming a good seal against the neck of the tank. This might be because the lip is cracked or uneven, perhaps?

I would have thought enough coolant leakage to prevent the system pressurising would be very noticeable. Air leakage less so.
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