Coolant Flush 5.7L

[hobbsy4]

Hi all,

Tried to save some money the other day and replace my coolant in the VZ 05 Calais v8. Stuffed it up a bit, put Nulon Long life green in, and only drained the radiator without doing a full flush. I haven't driven it since as it had the red stuff (which you can't buy in Blackwater).

To do a flush, other than opening the heater, flushing through heater hose, lower radiator hose etc, do I need to disconnnect/remove the thermostat and how is this done? Anything else that I should look out for when doing this? I can't see a bleed valve either but I think it should be right, with the lid at the highest point in the circuit. I have a Gregory's on the way but will take a while to arrive.

Thanks,
Hobbsy4

[wortus]

dump the coolant by removing the bottom radiator hose, remove a heater hose and flush out the heater core. Put it all back together and fill with clean water, take it for a drive, let it cool and drain it again, do this 2 or 3 times until the water coming out is clean and it should be OK. You can try a bottle of radiator flush if you want to as well.
I don't think removing the thermostat is nessecary if you do it this way however if you want to hose it out in one go without runing it then maybe?

[hobbsy4]

Thanks wortus, I had an idea that's the way I'd have to do it, and I dont urgently need the car right now luckily.

I gave it a flush last night and got it up to temperature before it turned green again, so thought I'd better ask.

[heyitsEnricoPallazzo]

Shoud be coolant drain plugs on each cylinder bank. Although not entirely sure.

[wortus]

Not sure about the V8 but with a V6 it's easier to dump the coolant a few times than it is to remove the drain plugs/knock sensors.

[vz ss l76]

hi i am a radiator repairer what u need to do is take the themostat out turn the heater on hot flush though the system u really need a flush gun u best off taking it to a radiator shop dont mix coolants u will get a chemical reaction and will start corroding things out