Hi all,

After some help if anyone is listening.

At the weekend the car took a while to heat up I thought, probably thermostat. I will swap it when I get 5 minutes.

Yesterday the car started overheating, so I let it cool and babied it home (temp gauge was at 1-2 o'clock, never outside the centre zone.)

I swapped the thermostat- it was knackered. All seemed to be going well.

Freezing air from the vents, so I opened the expansion tank and let out the screw, set all temp on hot and centre vents, fan on full. Some puffs of air came out and seemed to subside. Air still freezing.

At this point the IID tool showed the coolant temp as 105-108 and the oil temp rising from 78... I shut the car off when the oil temp got near 100 as it didn't seem to be making any difference. With the bleed screw out there was a constant steam escaping/hissing.

Please help I've no idea where to go with it now

Cheers
Steve Formerly happymadison1978

Looks like the overheating burst a hose- typically it was the hose that runs under the supercharger a la JustinP's thread.

What a faff. I've temporarily repaired it. These engines are a *@)#&%!) to bleed, patience and lots of coolant is the only way.

Anyhow, I am monitoring how the temp fix worked, hopefully it will survive long enough for me to get the money to buy my ex out of the house and recover, otherwise it's a quick stress test of one of the beams in my house.

Anyhow, just wanted to reiterate some of the threads on here about the sheer length of time it takes for air to work around the entire heating system on these things- it's as long as you'd expect + 30%!!

Thanks

 Formerly happymadison1978

They are an ABSOLUTE PIG to bleed the 4.2’s!!! Have taken 3hrs sometimes! Bloody things!

My indy is doing my stat later today, amongst other assorted service items, and mentioned how difficult the 4.2 is to bleed.

3 hours seems a hell of a long time. 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner

Thanks chaps, glad it's not just me!

Well a lengthy test drive (check coolant) then a top up and drive to work and back (12 miles each way in stop-start traffic)

Nice toasty cabin and Temp gauge dead centre the whole trip.

EDIT: I have started researching the supercharger removal for when I have to swap the whole hose.

 Formerly happymadison1978