ok my car was running fine with no overheating problems it. my car is turbo and the dp is right near the rad. im useing a koyo rad with 1.3bar cap and a jackson racing thermo. now for some reason i get out of no where over heating and it just dont cool down unless i turn the car off and let it sit. then i open the cap and fill ti and it takes alot like im loosing it. but im not leaking, not burning and my headgasket isnt shot cuz i got no smoke and the car runs perfect and starts perfect. no real time. if im driving it will over heat after a few days of adding coolant and if i get on it quick it does it too . i bled the system out a ton of times and it seems like i have air cuz if im overheating and i wait and open the bleeder i get burst of air like i had a pocket. i always have a hint of coolant smell and my buddy with a koyo said the same thing. any ideas how or what is going

cliff notes: car overheats with it seems to be low fluid or airpockets even after filling and bleeding. but no leaks or burning it. mind you the dp is close and i have a leak in my manifold that kinda shoots at the rad.

can it get so hot that it evaps? whats evap point of coolant?

any ideas of whats going on would be awesome thanks

 

Best thing to do is pressure test your coolant system to check for leaks. It sounds like you may have a hidden leak somewhere.

 

blown headgasket. boost pressure venting into the water jacket. pretty simple really..

 

we pressure tested it and t held good that was before i blew a rad hose, and wuldnt a blown headgasket smoke and not run right?

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Weq &raquo;</TD></TR><TR><TD CLASS="quote">blown headgasket. boost pressure venting into the water jacket. pretty simple really..

</TD></TR></TABLE>

That's more like a simple blind guess... pfft. There are so many factors with overheating it could be anything.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb_one &raquo;</TD></TR><TR><TD CLASS="quote">Best thing to do is pressure test your coolant system to check for leaks. It sounds like you may have a hidden leak somewhere. </TD></TR></TABLE>

The original poster stated that he's not burning OR leaking and IS loosing coolant. Since he is needs to fill up the radiator we know he's loosing coolant. That means he HAS to either leak or burn or both...

Is the overflow tank filling up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr. HYDE &raquo;</TD></TR><TR><TD CLASS="quote"> wuldnt a blown headgasket smoke and not run right?
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only if the gasket was leaking ALL the time. yours only leaks when you pressurize the compustion chamber and the boost pressure is venting into the water jacket causing air pockets witch cause overheating

 

Ive had many headgaskets blow on me. On every occasion the system held pressure perfectly, TK tests came up negative and comp was good. When u blow coolant under boost its the extra combustion pressure which breaches the seal.

Also Is he running a cat? because cats will hide alot of smoke produced by the engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Weq &raquo;</TD></TR><TR><TD CLASS="quote">Ive had many headgaskets blow on me. On every occasion the system held pressure perfectly, TK tests came up negative and comp was good. When u blow coolant under boost its the extra combustion pressure which breaches the seal.

Also Is he running a cat? because cats will hide alot of smoke produced by the engine.</TD></TR></TABLE>

Correction, sounds to me like an educated guess rather then a blind one...

Did your overflow tank fill every time you blew a HG or were there times when it remained normal?

I'm not firmilure with a "TK test". Is that some way to test carbons in the coolant?
My understanding is when under boost, exhaust gas from the cylinder gets pushed into the coolant system. Hot gas heats up your coolant quickly, there could be signs of oil in coolant, but a sure sign is when your overflow tank is always full after boosting. There's also a hydro-carbon tester you can use to see if there are signs of exhaust gas in you coolant, although I have never tried this personally.

I'm not sure if coolant will leak into the cylinders in this case because the exaust gas pressure is always higher then coolant pressure. Can anyone confirm this statement?



Modified by turbosi03 at 9:51 PM 7/13/2006

 

i have a billet overflow and it dumps out if it overflows and it hasnt yet. it looses coolant somewhere. can my headgasket be blown and i only notice it when the car is at its warmest running temps. cuz like today it was hot about 90 out and i drove home kinda hard here and there and everytime i came to a stop it overheated. also theres a very strong smell of coolant here and there and i think its ususally after i boost but it also happens just driveing it. if i go out to my car now after getting home i know ill need to put fluid in it and then it wont over heat for a day or 2 then start.

im running a 84mm cometic headgasket. are these known to go after a few months? where can i get an oem gsr headgasket that fits 84mm

also 2 days ago i was overheating good i opend the bleeder to have a burst of steam come out before fluid. then a few air pockets it seemd. i filled it and waitied till it came out steady. but this has happened a few times

 

so overflow isn't filling up at all?

 

its billet aluim so i cant tell unless it over flows but theres no coolant coming out the top hose

 

Check your heater core too, specially if your smelling coolant in your car. But, i would say head gasket too. Had two go like that.

 

how do u check the heater core. i mean it isnt leaking into the car and it still blows hot air.

 

I have had the little plastic heater valve at the front of the firewall crap out on me once before as well and leak from the little arm that opens and closes it.

It smelled strongly of coolant in the car as well.


I have also blown about 6 headgaskets over the years with nitrous and turbos and had similar symptoms. I would start simple though, when it's running and the heater is on, look at the valve and see if it's leaking.

Then check the carpet on the passenger side and see if it's damp.

The do an HC test on the water.

 

I had the same problem, and it turned out to be that the slim fans i was running werent covering enough surface area. i put the stock radiator and stock fans WITH the shrouds, and the problem went away.

Pressure tested the system to 19psi (~1.3 bar) and HC tested the steam out of the overflow can. Nothing out of the ordinary, and with no HC's detected.

Look into the fans.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jay_Sensing &raquo;</TD></TR><TR><TD CLASS="quote">I have had the little plastic heater valve at the front of the firewall crap out on me once before as well and leak from the little arm that opens and closes it.

It smelled strongly of coolant in the car as well.


I have also blown about 6 headgaskets over the years with nitrous and turbos and had similar symptoms. I would start simple though, when it's running and the heater is on, look at the valve and see if it's leaking.

Then check the carpet on the passenger side and see if it's damp.

The do an HC test on the water.</TD></TR></TABLE>

hmm u know that valve got pinched and it might have cracked (plastic crap)and i know it was leaking out of there so i double clamped it and it stoped leaking and i dont see any coolant inside the car. how did urs affect u and how was it changing it?

 

ttt cuz this is so arggervating

 

ok i found a leak, it was in my overflow container. now it isnt stock its a summit billet overflow tank it goes from the rad to the bottom with a hose and then the top is left open for overflow i guess. and the fitting on the bottom was loose leaking. could this be why im looseing fluid? when it builds pressure does it still go into the overflow and with the loose fitting it just be leaking and me not notice. cuz i dont remember ever seeing any puddles

 

anybody?

 

How would you go about testing the HC levels in the coolant?

I'm experiencing some similar symptons. I think the fact that my intercooler blocks off almost all the air going to the rad, combined with the fact that I removed the AC condensor and did not seal that side off with a shroud may be causing / contributing to my intermittent overheating, since the rad isn't getting enough air. If I knew the coolant had exhaust in it though, that sure would tell me something

 

ok my buddy says he seen small puffs of white smoke come out my exaust inbetween shifts and when i let off hte gas and got back on it. could this mean my headgaskets going?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr. HYDE &raquo;</TD></TR><TR><TD CLASS="quote">ok my buddy says he seen small puffs of white smoke come out my exaust inbetween shifts and when i let off hte gas and got back on it. could this mean my headgaskets going? </TD></TR></TABLE>

could be the HG on its way out...


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eastbay92cx &raquo;</TD></TR><TR><TD CLASS="quote">How would you go about testing the HC levels in the coolant?

I'm experiencing some similar symptons. I think the fact that my intercooler blocks off almost all the air going to the rad, combined with the fact that I removed the AC condensor and did not seal that side off with a shroud may be causing / contributing to my intermittent overheating, since the rad isn't getting enough air. If I knew the coolant had exhaust in it though, that sure would tell me something </TD></TR></TABLE>

you let the car get real hot, so that the coolant starts to boil over into the overflow tank...u get a tailpipe sniffer and place it in the presence in the boiling steam of the coolant.

 

do headgaskets show signs before going. cuz i thought they basically just blow

 

is your radiator fan turning on and possibly is it wired up correctly? My car was overheating because I had it wired up backwards so it was pushing the air back into the radiator instead of pulling it away. Just an idea...