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V8 coolant worry - head gasket??

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Baz31

Member Since: 23 Apr 2019
Location: Swadlincote
Posts: 126

2006 Discovery 3 TDV6 SE Auto Unknown Colour

V8 coolant worry - head gasket??

Hi
I have a 2005 4.4 v8, 92k miles, with a potential coolant issue.
When I start it from cold it can take 2 /3 mins to be up to temperature on the gauge and it sits there no worries.
The coolant was low today so topped it up and after running it had gone from the pink colour to a dark brown colour. Obvs I only put about 1/2 litre in so the majority will have been in there previously. It wasn’t changed or mentioned at a service 1000 miles ago.
The passenger side of the heater ( front and back) is cold but assume this to be the blend motor.
When it runs from cold and it’s damp in the air I get a lot of white out of the exhaust and today got left with 2 wet patches on the drive where it was running to sort a suspension issue out.

I am just going to get it booked in for a check but just pondering.

Does this sound like a head gasket or just a water pump / leak issue?
Is there anything I can do to check in the mean time?

Pic below is of the water marks after ticking over for 10 mins.

Click image to enlarge

Thanks
Baz

2nd Nov 2024 4:51 pm

kajtzu

Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6748

2005 Discovery 3 4.4 V8 HSE Auto Cairns Blue

Passenger side heater CAN be blend motor but more likely it'll be the heater core.

I think we can conclude that oil and coolant mix somewhere. The water pump does not pass oil through it, however, but the engine oil cooler does.

2nd Nov 2024 8:13 pm

Baz31

Member Since: 23 Apr 2019
Location: Swadlincote
Posts: 126

Thanks, will get them to check that, is there an easy way to diagnose the oil cooler?

With the heater core is that a flush or replacement? Thinking if the coolant is going to come out for the potential oil cooler then should plan the heater at the same time.
Off to Google!

2nd Nov 2024 8:18 pm

kajtzu

Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6748

Some people have succeeded somewhat by flushing. I did not. Straight up replacement is the best of course. It’s supposed to be easier on the RHD than the LHD. If you need a brand, the original is Nissens.

I have thought that oil in the coolant indicates likelihood of cooler while coolant in the oil indicates gasket. I’m just a master YouTube mechanic so you might take that with a grain of salt. (Ask your real mechanic)

2nd Nov 2024 8:38 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10674

2005 Discovery 3 TDV6 HSE Auto Rimini Red

Very cheap. Too cheap?

https://www.ebay.co.uk/itm/324483088768?mk...media=COPY

I guess if there is oil or majo in the coolant pipe on this, it’s an indication. And easier to to that 2 head gaskets.

I’d change the matrix several weeks after you sorted the other issue

2nd Nov 2024 8:41 pm

kajtzu

Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6748

Jesus, that’s not a cheap part at all is it?

https://www.lrdirect.com/4526544-oil-cooler-asy although I’d be fine with the
4526544.Z8 one since I’ve got a Nissens radiator and core already and they’ve been fine.

2nd Nov 2024 8:46 pm

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