Over heating

Re:Over heating (EssDub)

Fri, 14 Sep 2012 08:09:34 GMT

nick12

ah, the wonders of the world's most complicated cooling system.

LOL its not that f**king hard! :)
Spent about an hour draining and refilling Josh's SW20 turbo yesterday, as long as you have the car up in the air at the back and you bleed the system correctly (i.e, radiator bleed, HC bleed and filler cap) then you will be fine! Due to the sheer size of the system, burping it every few days for about 2 weeks afterwards is a good idea as it can get rid of the slightest bubble in the system that would get forced around by the water pump.

The worst thing you can do to them is stick cold water in an overheated engine... Then wonder why your car wont start LOL.

Re:Over heating (Deco)

Fri, 14 Sep 2012 01:25:10 GMT

At least this is experience i can now learn from. Mind you the damage was already done before i even realised there was an issue, im just happy it didnt get so hot that it could of siezed the engine.

Thank you everyone for all the help, you all have helped increase the learning curve that much more.

Ill post up the extent of damage once i find out

Re:Over heating (nick12)

Thu, 13 Sep 2012 20:04:04 GMT

ah, the wonders of the world's most complicated cooling system.

Re:Over heating (Deco)

Thu, 13 Sep 2012 19:12:08 GMT

Dudeman

Have you opened the bleed valve behind the spare wheel when filling the coolant?

No i didnt touch it, just filled it up and turned the engine on for it to suck it through and then refill again. My father and i didnt realise there was a bleed valve and that it needed to have the bleed valve open when filling her up. Just thought it was like filling up any other car with a self bleeding system.

Re:Over heating (TIPSIDUECE)

Thu, 13 Sep 2012 18:55:09 GMT

The way i gauged that it was about 2L lost was by how much i put back in before it over flowed.

you may have lost more than 2 liters, as it normally takes a long time to properly fill her up and bled. then u kept driving it with not enough coolant and air pockets in d system. ur lucky u werent driving in d freeway as it will not shut off untill ur head is cooked. i popped one of the cooling system hose once and over heated, shut d motor straight away lost most of the coolant. lucky caltex was round d corner, n lucky i have sum hose in d car that i used to temporarilly rigg her up. i filled and bled the system with tap water for more than 4 hours on d side of hoddle street on a rainy night. (emergency fill and bleed, just so i could safely drive the car home and perform a proper flush and bleed)
blown head gasket is d least of ur problems, blown cooked head is d worst case scenario

Re:Over heating (nick12)

Thu, 13 Sep 2012 18:50:27 GMT

Radiator cap is one thing, but also the plastic filler neck on the cooling system can weather and let air in, usually at the top of the first turn.

Re:Over heating (Dudeman)

Thu, 13 Sep 2012 18:38:14 GMT

Deco

Thanks Rob for such a quick reply.

Thats was my best guess but am unsure as it was just such a sudden issue. I guess its about time i had a mechanical issue in my 10 months of ownership haha.

With this over heating exercise i also found that the oil that i thought was coming from the gearbox that i was talking with you about earlier tonight was in actual fact coming from the purge tank over flow. Not sure if this has something to do with the over heating issue i have.

Have you opened the bleed valve behind the spare wheel when filling the coolant?

Re:Over heating (Deco)

Thu, 13 Sep 2012 13:52:25 GMT

It has a long way to go unfortunately. I have been stripping it down over the last month. Need to get parts and have her machined/rebuilt. Once thats done its down to getting everything else such as exhaust mani, turbo, fuel rail, intercooler etc since all i have is a long block and then i just need all the conversion parts gearbox, drive shafts/hubs and turbo loom.

Re:Over heating (Mr2gtracer)

Thu, 13 Sep 2012 12:46:45 GMT

How much more do you have to do with the 3sgte to get it running?

Re:Over heating (Deco)

Thu, 13 Sep 2012 12:18:52 GMT

Im waiting for my mechanic to get back to me about the extent of what has happend. If it going to need rebuilding, i guess i need to get moving along with rebuilding the GTE thats sitting in the garage and just do the conversion.

Re:Over heating (surok)

Thu, 13 Sep 2012 11:57:12 GMT

time for V6!

Re:Over heating (MR2QIK)

Thu, 13 Sep 2012 11:52:58 GMT

That doesn't sound good. You can try all the normal stuff (cap, thermostat etc), but I'm leaning towards a BHG.

Re:Over heating (MRTurbo)

Thu, 13 Sep 2012 10:29:58 GMT

Well mine overheated the other night (after a hard run mind you) and it was air the in system caused IMO by a faulty radiator cap. Check your radiator caps guys!

Re:Over heating (Deco)

Thu, 13 Sep 2012 09:21:46 GMT

The car hasnt had any cooling issues in the time ive owned it nor with the last previous owner. The way i gauged that it was about 2L lost was by how much i put back in before it over flowed. I am unsure of where the oil is coming from...my mechanic assured me it wasnt coming from where i thought it was. So thats still a mystery, though the oil i found was quite watered down compared to engine oil. This has me wondering was this possibly an early sign of this cooling/leakage issue.

My mechanic has had a look at it and suspects that it was indeed the thermostat that went but has now found that gases are leaking into the cooling system as the coolant was foaming up and continuously over flowing through the in-fluctuation of gasses in the system. So its a warped head gasket " />

Re:Over heating (purple5ive)

Thu, 13 Sep 2012 08:25:52 GMT

sorry to hear this, as the cooling system is sually good on the mr2 unless its been neglected..
you said there was oil coming from the reservoir over flow??? or was it red coolant you though was oil..

boiling coolant will evaporate as soon as it spews out from the engine so saying on 2 litres was lost is a gamble at best. and if its anything like i had the coolant will just boil out the reservoir and dissapear

the radiator isnt warm because theres no coolant in it , so you have lost more than 2 litres i think
and driving 2kms after finding an overheating problem wasnt the best idea either.
in my case i had an headgasket issue, and coolant was coming out the oveflow tank until it got to a point where there want any coolant left in the block and then the temp. gauge would skyrocket, this was taking about 45 mins to happen, so i wasnt aware of it straight away... there ended up being a small crack in the gasket which would slowly leak and eventually cause overheating in my case..

either way make sure the car is filled PROPERLY with coolant (13.6 litres afaik) and then check for issues, i would replace the thermostat as well to rule that out