CrAzY overheating problem. . . opinoins? help?

99CivicSiBrian

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Word.
So lets see. I jsut got the car done yesterday and it seems to be pretty solid. I drove it around slow for a while to check things out and would give maybe 50% throttle to see if it flies apart or does anything weird. A-OK.
So today I jump in with some luggage and people and we are going to drive the thing to South Carolina. We get on 30 and roll at like 70mph. In like 4 or 5 miles, the temp starts to climb above the normal level. I panic and turn on the heat to help control it. The running heater does the trick but obviously this will not make for a pleasant 700 mile ride. I take it back to work to ask for advice.
At the shop, we determined that perhaps we weren't getting enough air flow through the FMIC and then over the radiator. I took off the one air diverter shield that blocked air from going to the engine/turbo and manifold area.
We started off again. Car ran perfect to 30, but 5 miles down 30 it started to get hot again! Ok so. . . thermostat? fan switch? Neither seem like they are definitely the reason, but we got to York and I let the car cool off while washing it (not spraying the engine). I changed the thermostat and fan switch in the parking lot, bled the system twice and idled until the fan ran twice. Good!?
NOPE
Drove down 30 in York through the lights and it was fine. Once on 83 for about 10 minutes it started to get hot again! I am not trying to do anything other than drive the car and maintain speed - definitely not boosting.
For reference, car is a 95 Civic EX w/ SOHC VTEC and stock single core radiator. Infront of that is the 28" x 7" FMIC. Turbo has tubular manifold and is heat wrapped.

Any ideas on anything crazy to try?
 

Destroy

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Head gasket.
 


99CivicSiBrian

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:word:
is your resavore (sp?) tank getting full?? is it getting empty??
It has varied but never filled. It has gone below and above max but never predictibly. Also, when I run with the cap off I don't get the normal air bubbles. Actually, if I remove the cap when the system is hot it doesn't squirt out all over the place either. . . weird or what?
B
 


civic98turbo

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dude i have the same problem....execpt my resovoir tank is getting empty...you guys think its a head gasket?
 

jason_guy_yeah

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I would have to agree with the headgasket. Is your oil white? Is your exhaust white? coolant oily? low compression on any cylinders? coolant in cylinders?...
 

civic98turbo

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i haven't done a leakdown test...but was told that when my car was on the dyno...it should be putting better numbers down...and that i should test the compression....maybe i'll have to do that...
 

99CivicSiBrian

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I would have to agree with the headgasket. Is your oil white? Is your exhaust white? coolant oily? low compression on any cylinders? coolant in cylinders?...
The oil is 100% normal, light caramel colored.
The exhaust is invisible at idle, and black under 20% or greater throttle, so normal for a cat-less car.
Coolant seems to be normal and not oily although I wasn't very careful with the funnel I used last time and I may have washed about a 1/2 teaspoon of some oily substance into the system. My bad. I've got Water Wetter in there along with a good 50/50 mix.
Compression seems normal but I haven't checked.
Does not seem to be coolant in any cylinders.

We have concluded that it is an airflow issue. The radiator is still the stock single core, so it's approximately 13"x15"x.75" and the FMIC is like 28x7x2.5 and obviously sits infront of the radiator blocking the air from getting to teh radiator properly.
So, I am first going to try an all-aluminum radiator that is about 13"x15"x2" and a stronger fan. If that provides the desired effect but still isn't quite enough, then I may run 1 or 2 6" puller fans on the FMIC to get more air into the engine compartment.
I've also considered a reverse-scoop hood or something with some vents to let the heat out and just rock the stocker in the winter since the heater will be on to help with additional cooling.
If that still doesn't work, then we must conclude the headgasket or something weird, but atleast I will have an upgraded cooling system. Then I can just strap on the head on my bench with a thicker gasket and roll with it.
Word.
 

mike@synapse

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yeah i would suggest an aluminum radiator, and try running all water with water wetter, no antifreeze it does wonders. obviously if you drive the car in the winter switch to antifreeze.
 

99CivicSiBrian

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yeah i would suggest an aluminum radiator, and try running all water with water wetter, no antifreeze it does wonders. obviously if you drive the car in the winter switch to antifreeze.
Word.
I just ordered the aluminum radiator so until then I just will have to keep it under 100mile trips and under 70mph. I'm also working on getting GSR injectors and a better fuel pump. I'll install the Vortech FMU this afternoon or tomorrow. I only mention that because it will most likely prevent me from running lean on the highway atleast.
Word.
B
 
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BIGblockEJ7

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it is def. the radiator... i was having the same issues with my turbo setup the intercooler is blocking to much air flow from the rad. your best bet for the price is get a dual core rad. out of a automatic ex, geta jacksonracing or mugen thermostat and a 10-12 inch slim fan this should do the trick. also the qoute above about using water and water wetter will also help, use distilled water no coolant and a water wetter to lubricate. should take care of it!
 

mike@synapse

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Word.
I just ordered the aluminum radiator so until then I just will have to keep it under 100mile trips and under 70mph. I'm also working on getting GSR injectors and a better fuel pump. I'll install the Vortech FMU this afternoon or tomorrow. I only mention that because it will most likely prevent me from running lean on the highway atleast.
Word.
B
wait what were you using to tune before?
 

slowhatch

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it is also the dead of summer right now and all the extra heat from your turbo could be causing problems too. my brother is the only one i know if that encounters problems from the heat but i would have to say its your headgasket. is the top of the reservoir wet when you start noticing you're overheating?

edit: just saw that you still have a single core radiator, get a stock dual core and you'll be fine.
 

99CivicSiBrian

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New radiator installed, bled, burped, and ready for repeat conditions testing. Will get back to you in a few hours.
B
 

99CivicSiBrian

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After running more-than-hard enough to over work the stock radiator, I can confirm that it was the issue. The temp needle did not move at all and I exceeded the 70mph mark for long enough.
Word.
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