Coolant loss

Teal2008 · Mar 13, 2020

Hi all I have been losing coolant slowly over a couple of weeks. I have has a pressure tester on it for about a hour and holds pressure with no sign of any coolant leak. It runns sweet with no white smoke at all. So I don't think it's going out the back. I have recently replaced the head gasket and had the head checked and skimmed all OK. I can't seem to see any signs. Any ideas on common places to leak apart from the p gasket that has been replaced recently along with water pump

kermit_rr · Mar 13, 2020

Run it up to temp then put the pressure tester on it again. See if it holds pressure when it's hot

steve2286w · Mar 13, 2020

And rev it from engine bay while looking around

Teal2008 · Mar 13, 2020

Thanks I will give it a try hopefully I'll find it.

Teal2008 · Mar 20, 2020

Still no sign of a leak just had it out for a blast run it up to temperature and had the pressure tester on it and had it running with it on with no pressure loss. No sign of a leak or it coming out the back. Any further ideas guys.

kermit_rr · Mar 20, 2020

You mean it's running ok? Not over pressuring? No coolant loss?
Dodgy cap?

currymunster · Jun 18, 2020

Heater matrix?
Remove engine cover and check the heater pipes at the back by the bulkhead.
Pipe at the bottom of resivour can leak without being seen easy.
P gasket is an obvious one
Just keep looking.

tommy_d_mac_1980 · May 26, 2021

Teal2008 said:
Hi all I have been losing coolant slowly over a couple of weeks. I have has a pressure tester on it for about a hour and holds pressure with no sign of any coolant leak. It runns sweet with no white smoke at all. So I don't think it's going out the back. I have recently replaced the head gasket and had the head checked and skimmed all OK. I can't seem to see any signs. Any ideas on common places to leak apart from the p gasket that has been replaced recently along with water pump

Did you find it in the end? I’ve got a similar slow leak.

Firebobby1 · Jun 4, 2021

My 300 was slowly loosing coolant, it was the P gasket. Never dropped anything on the drive.
I could just see the stained on the block

Coolant loss

Teal2008

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kermit_rr

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steve2286w

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Teal2008

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Teal2008

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kermit_rr

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currymunster

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tommy_d_mac_1980

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Firebobby1

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