2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

My turbo ii is over heating

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Old Aug 27, 2009 | 10:37 PM
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BotieRacing954's Avatar
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From: South Florida
FL My turbo ii is over heating

I have a 88 base model rx7 with turbo II s5 drive line it keeps over heating and i cant find out what it is i have a very strong ele fan but it is still over heating and every time i stop it over flows and leaves a pool of boiling water on the ground i need help bad please help me out thanks guys
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Old Aug 28, 2009 | 06:38 AM
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Originally Posted by BotieRacing954
I have a 88 base model rx7 with turbo II s5 drive line it keeps over heating and i cant find out what it is i have a very strong ele fan but it is still over heating and every time i stop it over flows and leaves a pool of boiling water on the ground i need help bad please help me out thanks guys
I am going to say its time to rebuild it.. Might be a bad water pump or thermostat, but that would be about it, besides maybe a clog of rust/slime in the engine cooling system.
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Old Aug 28, 2009 | 07:11 AM
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Originally Posted by BotieRacing954
I have a 88 base model rx7 with turbo II s5 drive line it keeps over heating and i cant find out what it is i have a very strong ele fan but it is still over heating and every time i stop it over flows and leaves a pool of boiling water on the ground i need help bad please help me out thanks guys
Originally Posted by glhs0867
I am going to say its time to rebuild it.. Might be a bad water pump or thermostat, but that would be about it, besides maybe a clog of rust/slime in the engine cooling system.
So, he has a cooling system problem and your first recommendation is to rebuild the engine?
Charter member of the "Go big or go home" club, eh?

It is possible that he has blown coolant seals- although there's no mention of billowing smoke from the tailpipe- but it's more logical (and far cheaper) to look at the cooling subsystem first. Besides, any work to the cooling would still be valid if the engine needed work anyway.

@OP:
You make no mention of the general condition of the car...how long have you had it and what do know about the state of the components?
With drastic results such as yours, I'd be inclined to go through the whole cooling loop since bleeding is a general PITA (not to mention the rising cost of antifreeze makes it a non-trivial expense anymore).
Replace the thermostat, hoses, pressure cap, belt and waterpump.
Rad too, unless you're certain it's in good shape.

This take no prisoners approach may seem like a contradiction to my opening statements but it's actually maximizing your time and effort.
The whole project is an easy afternoon's work and once you're done, you're done and there's no question about the health of the loop.

Might as well get it over with before winter sets in...the irony of watching your car boil over while you freeze your *** off will be totally lost on you.
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Old Aug 28, 2009 | 08:39 AM
  #4  
SUPRAMAN
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Originally Posted by clokker
So, he has a cooling system problem and your first recommendation is to rebuild the engine?
Charter member of the "Go big or go home" club, eh?

It is possible that he has blown coolant seals- although there's no mention of billowing smoke from the tailpipe- but it's more logical (and far cheaper) to look at the cooling subsystem first. Besides, any work to the cooling would still be valid if the engine needed work anyway.

@OP:
You make no mention of the general condition of the car...how long have you had it and what do know about the state of the components?
With drastic results such as yours, I'd be inclined to go through the whole cooling loop since bleeding is a general PITA (not to mention the rising cost of antifreeze makes it a non-trivial expense anymore).
Replace the thermostat, hoses, pressure cap, belt and waterpump.
Rad too, unless you're certain it's in good shape.

This take no prisoners approach may seem like a contradiction to my opening statements but it's actually maximizing your time and effort.
The whole project is an easy afternoon's work and once you're done, you're done and there's no question about the health of the loop.

Might as well get it over with before winter sets in...the irony of watching your car boil over while you freeze your *** off will be totally lost on you.
exactly...... don't just jump to the conclusion that your motor is done and needs a rebuild. How many miles are on the motor? How long does it take to over heat, is it within 5 minutes of driving or an hour?
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Old Aug 28, 2009 | 09:50 AM
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do you have an undertray?
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Old Aug 28, 2009 | 09:50 AM
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I am speaking from experience here. I have never seen an overheated Turbo S5 that didn't need rebuilt. I am sure your coolant system is way under par, hence your overheating. If it is just coolant seals, thats a rebuild to in my book. Why pull the enigne out and not rebuild it, is beyond me..

Besides this I live In Florida too and its been over 96 degrees for a week or two, I am almost 100% sure you toasted the engine.
Just trying to be real. You going to have to rebuild the coolant system anyways after you rebuild, or your new engine will blow too.
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Old Aug 28, 2009 | 01:02 PM
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Check the basics first. Radiator caps, OEM thermostat, clogged radiator. Then move on to more in depth approaches next.
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Old Aug 28, 2009 | 01:12 PM
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Originally Posted by glhs0867
I am speaking from experience here. I have never seen an overheated Turbo S5 that didn't need rebuilt. I am sure your coolant system is way under par, hence your overheating. If it is just coolant seals, thats a rebuild to in my book. Why pull the enigne out and not rebuild it, is beyond me..

Besides this I live In Florida too and its been over 96 degrees for a week or two, I am almost 100% sure you toasted the engine.
Just trying to be real. You going to have to rebuild the coolant system anyways after you rebuild, or your new engine will blow too.
Wow, that's just wrong. It takes a fair amount of heat to cook these things, and if it just got hot enough to fill the overflow tank and you shut it down you should be ok. If it's a consistant overheating issue that's another story however and you should be ever vigilant if not paranoid in keeping an eye on that temp guage, and dont drive the thing until you fix it unless you want to be rebuilding the engine!

What exactly constitutes "rebuilding the coolant system anyways?"

to the OP:

Check that your water pump is not leaking water out of the weep hole, this is a small hole behind the pulley on the pump. If water is leaking from that, then your water pump has failed and needs to be replaced

Check that your thermostat is functioning properly

Check that your radiator cap is sealing and the gasket is in good condition (this is easily overlooked and indeed claimed the life of my last T2)

Check that you have bled all the air out of the coolant system

Finally, get an aftermarket water temp guage in that thing because the s5 temp guage is a P.O.S. and can not be trusted.
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Old Aug 28, 2009 | 03:16 PM
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sounds good and my motor only has 45000 miles on it it only boils some times but most of the time it just dumps water out of the catch can and it is not like boiling but i will lookin in to the parts
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Old Aug 31, 2009 | 06:50 AM
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From: Seminole,Fl
Originally Posted by BotieRacing954
sounds good and my motor only has 45000 miles on it it only boils some times but most of the time it just dumps water out of the catch can and it is not like boiling but i will lookin in to the parts
How fast does this happen."overheat". I can tell you what is wrong with the amount of time it takes till it overheats..


It dumps water all the time, but only boils it sometimes...what?? Its not boiling all the time? It dumps cold coolant?
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