Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Losing Coolant

Tom_1569

Ecotech Power
Joined
Nov 19, 2006
Messages
2,236
Reaction score
47
Points
48
Location
Gippsland - VIC
Members Ride
'14 SR5 Pusslux
VT V6 Series 1.

After turning the car off, a couple of minutes later its leaking coolant, its wet the bonnet mat, and sitting on top of the radiator near the top hose and a puddle under the car. The coolant is definitly due for a change, now a browny green colour.

Should I be checking anything else of why its leaking? I only do long trips so not sure if its doing it on short trips, but it does seem to heat quicker in traffic, but not overheating.

How many litres of coolant do I need for a full flush, and what percentage water? Im on bore water so should I be buying demineralised water?

Do I need to bleed the system afterwards, if so how?
 

Tom_1569

Ecotech Power
Joined
Nov 19, 2006
Messages
2,236
Reaction score
47
Points
48
Location
Gippsland - VIC
Members Ride
'14 SR5 Pusslux
Answering my own question sort of lol.

On the way home I bought new rad hoses and clamps in prep for flushing. Get home notice that its spraying out the heater hose, bugger, rad hoses were 45 bux :(
Ill go down shortly and buy heater hoses and coolant.

Reading the holden manual it says to remove the knock sensors to flush the system? Do I need to do this?
 

Tom_1569

Ecotech Power
Joined
Nov 19, 2006
Messages
2,236
Reaction score
47
Points
48
Location
Gippsland - VIC
Members Ride
'14 SR5 Pusslux
I dominate this thread lol.

Spoke to Holden, they said theres no need to remove knock sensors, and would be pretty hard to do without a hoist anyway.

Im just going to do the whole lot, all hoses, full flush, new thermostat, even bought Genuine Coolant and the tablets lol. Just want to get it all out of the way, this cart does 1000Km's a week and cant afford to be off the road.
 

accentstencil

Well-Known Member
Joined
Jun 30, 2005
Messages
8,164
Reaction score
374
Points
83
Age
68
Location
Eschol Park, Sydney
Members Ride
WH II Caprice, 5.7 2017 Captiva.
I've never removed the knock sensors to do a flush because it is a difficult job which is not really worth the effort. The only problem with not removing the knock sensors is that there will still be some clean water in the system after flushing. To combat this I make sure I put 6 litres of coolant concentrate in first then top up with water. The system holds 12 litres.
 

Tom_1569

Ecotech Power
Joined
Nov 19, 2006
Messages
2,236
Reaction score
47
Points
48
Location
Gippsland - VIC
Members Ride
'14 SR5 Pusslux
Yeah, They recon you cant do it without a hoist, and honestly I cbf'd to get it on the hoist. I havent slept and needed a resolution but didnt wanna be doing it all again next week either. I used 5 litres of holdens coolant, because thats all they gave me and said it was enough, then I read cooling system is 12 or 13 litres. It'll be right anyway, its mainly highway K's and doesnt get hot.
All done, all up cost $146.16 for those interested in how much it costs to do a cooling system flush on a VT V6.

Prices for futurue reference:
Hose - Water pump to Heater Tap $17.94 (Holden)
Hose - Water pump to Heater tap $10.49 (Repco) There is two different hoses needed and holden didnt have the second one.
Hose - Rad to Water pump bottom $14.72 (R&E Autos, smaller local auto parts store)
Hose - Rad to Water pump top $25.50 (R&E again)
Holden Genuine longer life coolant 5L $44.85 (Holden)
Thermostat Gasket $3.05 (Holden)
Thermostat $10.87 (Holden)
3 Genuine Sealing pellets $10.06 (Holden)

On a side note what do the Pellets actually do, Holden said I really should use them, but my mate whos been a mechanic for 10 years has never heard of anyone ever using them, and looked at me strange when I said about putting them in.
 

accentstencil

Well-Known Member
Joined
Jun 30, 2005
Messages
8,164
Reaction score
374
Points
83
Age
68
Location
Eschol Park, Sydney
Members Ride
WH II Caprice, 5.7 2017 Captiva.
I believe the pellets block small leaks. I never use them though.
 

nicko

Carbon Positive - DO IT!!
Joined
Sep 29, 2007
Messages
1,435
Reaction score
34
Points
0
Location
sa
Members Ride
75 cruiser ute
i just bought HEAPS of distilled water. pulled my bottom rad hose off and then put it back on, Filled it up with distilled water, ran the car with the heater on. Dumped all that water again. then filled it up with coolant and distilled water.
 

WAGON MAN

Gas Sleeper
Joined
Jun 7, 2006
Messages
1,059
Reaction score
11
Points
38
Location
North Coast , NSW
Members Ride
VX S2 Berlina Wagon with Phreddied bits.
The pellets are actually crushed walnut shells,

the bits flow around with the coolant.

They chip any buildup away from the back of the water pump seal helping to stop leaks.
 

pablo

Donating member
Joined
May 29, 2006
Messages
760
Reaction score
8
Points
0
Location
Adelaide
Members Ride
Was a 1997 vt v6 wagon
nicko, pulling the bottom hose off only releases about half the water in the block. When I once did it that way, I measured what drained out, and it was only 6 liters, half of the system contents. So if you then filled it with 50/50 coolant on top of what was left behind, that would mean you only have a 25% concentration, way too low for corrosion protection on the radiator and welch plugs.
 
Top