Rizo
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Overheating Mr2 Turbo
Hey Guys. Got a bit of an issue with overheating on a GT Turbo Mr2. The previous owner had the radiator removed and flushed, new coolant and system bled properly. I drove the car for most of the day without any problems and then all of a sudden when I got home after a drive from the city the temperature was almost in the red. The coolant reservoir bottle had popped its lid and coolant was all over the back of the car. Not happy to say the least. But here is where it gets strange. The Next day i topped up the radiator spout with water and went for 30 min drive and.......nothing, held normal temp just fine. Any suggestions as to what caused it to overheat originally and be fine the next day? The only thing i can think of would be a sticking thermostat, but I'm no expert with these cars (its all backwards and new to me)
Any help is much appreciated
Thanks Guys
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WIDEMR
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Re:Overheating Mr2 Turbo
2012/04/07 17:35:43
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If it lost a bit of water and you toped it up, i would bleed it again, and to rule out that it wasnt bleed properly by the previous owners mechanic which is very common.
Do a search if you dont know how to bleed it properly, with the clear bleed hoses under the front bonnet on the radiator and the heater plus rad cap.
Could be thermostat, there not expensive or that hard to get to so maybe do that first, again to rule it out, then bleed of course.
Were you driving most of the time or start stop trafic or lots of idle'n? if driving then shouldnt be the thermo fans not turning on ect.
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WIDEMR
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Re:Overheating Mr2 Turbo
2012/04/07 17:38:45
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Also the factory temp gauge isnt liner, as in it wont move up and down exactly as the water temp does, it will up to a set point in the middle, as the temp increases a bit it will still stay in the middle, untill it goes up past a set temp then seems to spike up to near hot.
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Rizo
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Re:Overheating Mr2 Turbo
2012/04/07 20:34:25
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Thanks for your help, much appreciated. I took the car out for a run just now and it didnt overheat even though I was giving it a bit of stick. But.... when I got home I could hear a bubbling noise coming from the top radiator pipe under the engine cover. Its also dropping coolant from somewhere at the back of the car. Im confused by all this, but the car is going to Al Palmers workshop on Tuesday with a long **** list of things to do. hopefully they can sort it out.
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WIDEMR
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Re:Overheating Mr2 Turbo
2012/04/07 20:49:54
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loosing coolant from the back of the car? from the coolant reservoir?
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nick12
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Re:Overheating Mr2 Turbo
2012/04/07 20:51:17
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any white/grey coolant marks on the neck of the radiator filler, as it turns the first corner (the neck, not the MR2). That is a common place for a crack allowing coolant to get out and air to get in.. Naturally, once air can get into the system, the MR2 (having the most complicated fluid mechanics ever invented for a car) has problems deciding how to tell you what is wrong. Otherwise it could easily be a head gasket. good luck
post edited by nick12 - 2012/04/07 20:57:14
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Rizo
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Re:Overheating Mr2 Turbo
2012/04/07 21:10:16
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the water isnt coming from the overflow, its more towards the centre of the enginebay. Ill check the Radiator neck tomorrow. I dont think its a headgasket, I cant see any water in the oil (going off the dipstick and oil filler cap). The bubbling noise in the top radiator pipe is a bit of a worry though. Hopefully the lads at the workshop can sort it out on tuesday
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nick12
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Re:Overheating Mr2 Turbo
2012/04/07 21:14:00
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Regrettably I didn't see any water in the oil either, but when the car quickly thereafter started to exhaust coolant and and in fact inhaled so much of the stuff that it wouldn't start in the mechanic's driveway, we started to suspect that something was getting past the head gasket..
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EssDub
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Re:Overheating Mr2 Turbo
2012/04/07 21:14:58
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Whereabouts are you located?
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EssDub
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Re:Overheating Mr2 Turbo
2012/04/07 21:17:34
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If the thing is leaking from a central position, Check your top heater hoses, they are a known issue and can fatigue and crack. They are visible right up against your exhaust heat shield on the front firewall and they go to the water jacket, right where the sensors are.
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Rizo
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Re:Overheating Mr2 Turbo
2012/04/07 21:19:43
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I only got this car a few days ago but I cant understand why the previous owner would treat the car like **** and not look after it? Its not a common car and even though I have only had it for a few days I think its quite a special little car. I have had skylines, supras and rx7s in the past and they were all not as special as the Mr2. The thing goes around corners like nothing I have experienced before and for a 23 year old design looks better than anything being mass produced since. I'll get this car fixed and running like it should regardless of the cost. I think its important to keep as many of these cars on the road as we can because I hardly see any on the road anymore in Sydney. Also as a final ***k you to the previous owners who didnt have the sense to appreciate the car like it should be, I'll keep the car on the road and running as long as I can.
Thanks for your help Lads, much appreciated
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Rizo
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Re:Overheating Mr2 Turbo
2012/04/07 21:21:51
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Located in Western Sydney EssDub
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robk
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Re:Overheating Mr2 Turbo
2012/04/07 21:27:01
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Rizo
Its not a common car and even though I have only had it for a few days I think its quite a special little car. I have had skylines, supras and rx7s in the past and they were all not as special as the Mr2. The thing goes around corners like nothing I have experienced before and for a 23 year old design looks better than anything being mass produced since.
I love hearing people say things like this about the MR2 
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nick12
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Re:Overheating Mr2 Turbo
2012/04/07 21:35:05
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I agree with the sentiment.
The car is an absolute cracker, stunning styling and wonderful performance.
If your ambition is to attract sympathetic owners and the occasional geek (inevitably male) this is the car for you.
If you want to attract the sympathetic eye of sixty something women and everyone else with a beard, you should try my loud blue '62 mini..
Both are considered road biscuits by the majority of 4wd and Volvo fanatics (if that is the best way to describe them..)
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DVSTurbo2
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Re:Overheating Mr2 Turbo
2012/04/07 21:36:18
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I feel your pain Rizo,
My overheating issues started after I had Mr T (Toyota) service my sdub. Needless to say they failed to change the coolant correctly. 1.5 years later (and a lot of cash spent) i just swapped out the engine with a Gen 3.
Would have preferred spending that cash on a project like Robk's :) but I wasn't going to give up on my MR2.
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