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Author Topic: Overheating  (Read 3992 times)

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laney101

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Overheating
« on: 16 May 2017, 15:51:22 »

Today omega overheated and saw 100 on degrees on needle... never seen it that high normally always half way or just below not matter on condition...  heater got turned on full and still didn't drop so pulled over turned car off.. checked header tank and was empty which is strange as was full yesterday ...

Although hot and pressurised slowly unscrewed cap not fully just enough to let it breathe and all of a sudden tank filled up with coolant?..

Anyone any ideas once coolant in tank I left cap loose and drove home heater on full whack window open and managed to stay about 95 on gauge got home no coolant again ...

Any help be appreciated car running fine in it self
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cam.in.head

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Re: Overheating
« Reply #1 on: 16 May 2017, 17:21:09 »

If you have not done any cooling system work on it recently then an air lock can't appear from nowhere so I would fill tank up again when cold and check around. Any oily residue in tank ? Any signs of water on dipstick or excessive Mayo in filler cap ? .any signs of water leaks from water pump,hoses,plastic radiator sides,heater valve ,inside car ? Hopefully it will be a leak somewhere rather than more serious but have a look around
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TheBoy

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Re: Overheating
« Reply #2 on: 16 May 2017, 17:40:08 »

Will be a leak somewhere, just a case of tracking it down.

HBV always favourite
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mandula

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Re: Overheating
« Reply #3 on: 16 May 2017, 18:25:51 »

"Although hot and pressurised slowly unscrewed cap not fully just enough to let it breathe and all of a sudden tank filled up with coolant?.. "

That doesn't sound like a leak to me, if tank really filled up to it's original level?

Could it just be that due to overheating, coolant liquid boils causing tank to appear empty, and when opening the cap pressure releases and allows coolant to fill tank up again?

Could it be ceased up thermostat or old coolant liquid causing the overheating, or even defected water pump?
« Last Edit: 16 May 2017, 18:37:37 by mandula »
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laney101

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Re: Overheating
« Reply #4 on: 16 May 2017, 21:49:49 »

No coolant on path and no obvious leaks..  I didn't think he airlock as not had work done on it...
No mayo in cap no water on dipstick and tank relatively clean ..

I'm tempted to just swap major components and renew system.. lower stat from Courtney sport.
New temp sensor.. new HBV and new coolant.
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Doctor Gollum

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Re: Overheating
« Reply #5 on: 16 May 2017, 23:05:23 »

No obvious leaks roughly translates to 'not the HBV' rather than no leaks... Plenum and inlet off and pressure test it cold and hot ;)
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TheBoy

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Re: Overheating
« Reply #6 on: 17 May 2017, 14:16:47 »

When cap removed when hot, expansion causes coolant level to rise in a pressurised system like Omega.


To OP, you have a leak if you have to repeatably top up. End of.
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laney101

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Re: Overheating
« Reply #7 on: 17 May 2017, 16:15:43 »

im not having to top up  .. once hot if i release cap header tank fills back up again but after a drive re empties butengine getting hot..

so coolant still in system . but engine getting stinking hot..

and no leaks as nothing in engine bay wet no smell of coolant and nothing under car

shall run it from cold and watch from engine and have a look around.. fans are kicking in but still getting hot.. probs just replace major items as on age will do it good as said low temp thermostat and temp sensor and hbv all new then for not a lot of money .


When cap removed when hot, expansion causes coolant level to rise in a pressurised system like Omega.


To OP, you have a leak if you have to repeatably top up. End of.
« Last Edit: 17 May 2017, 16:19:30 by laney101 »
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TheBoy

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Re: Overheating
« Reply #8 on: 17 May 2017, 17:29:19 »

Ok, let it cool, top up to cold mark with 50:50 antifreeze, then see what happens
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laney101

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Re: Overheating
« Reply #9 on: 17 May 2017, 18:31:44 »


Ok cheers shall do

Ok, let it cool, top up to cold mark with 50:50 antifreeze, then see what happens
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Diamond Black Geezer

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Re: Overheating
« Reply #10 on: 17 May 2017, 21:33:20 »

What age is your V6, please, OP?

In the last 6 months I've gathered enough info to devote at least three chapters of my memoirs to coolant issues on my V6! Take a seat, get a cuppa....  ::) :D


Reasons for my overheating/high temp gauge readings being .... (in approximate order of occurrence)

1 Thermostat + transfer pipe - replaced
2 Coolant flush and associated - Air lock
3 Coolant temp sensor - replaced
4 Header tank cap - Slight leak
5 HBV (possible, changed anyway) -
6 Heater matrix (back flushed) - partially blocked
7 Pipe coming from rear of engine (under scuttle) - split leaking
8 The other pipe coming from rear of engine (under scuttle) - split also leaking
9 Radiator - replaced with brand new (and cleaned old sensors mounted in rad)
10 Leaking main pipe - upon refitting replaced jubilee clip for wrong size (old one broke), following day replaced with correct size.

Each time anything was done to the coolant system that required a coolant dump, recover what I could, refill, and then often airlocks for a few days afterwards because I didn't bleed the system for long enough. You need to make sure the thermostat opens once, or even twice, ideally.

Eventually it was down to two main factors - the leaking pipes (which were a pig to get to, just a warning!) and a 21 yr old silted up rad. The others were probably adding slightly to the problem.

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Doctor Gollum

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Re: Overheating
« Reply #11 on: 17 May 2017, 21:37:24 »

System is self bleeding. Only way to get significant airlocks is to fail to bleed the system with the heater temp set to max. ;)
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Bigron

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Re: Overheating
« Reply #12 on: 17 May 2017, 21:44:44 »

I hope that I'm wrong, but could it possibly be head gasket? That would over-pressurise the coling system and cause the coolant to appear low, only to return to normal level when the pressure is relaeased.  :(

Ron.
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TheBoy

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Re: Overheating
« Reply #13 on: 18 May 2017, 10:31:19 »

I hope that I'm wrong, but could it possibly be head gasket? That would over-pressurise the coling system and cause the coolant to appear low, only to return to normal level when the pressure is relaeased.  :(

Ron.
Unlikely
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Bigron

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Re: Overheating
« Reply #14 on: 18 May 2017, 11:24:12 »

Good, TB - I'm glad to be wrong!  :y

Ron.
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