hxdrt

Ok.. When I get done driving my car my coolant is boiling in the overflow.
I thought it was the headgasket, so I spent 8 hours to change my headgasket, and it still boils in the overflow...... My headgasket was indeed bad, because it burnt oil and coolant, and now it doesn't. But anyway, I flushed my coolant and added fresh and bled the system and filled everything up.

So why is my coolant boiling in the overflow???? What could it be? Thanks. Darrin

1boostedhybrid

Try replacing your WP, I had the same problem it turned out the water pump seal had a pinhole leak , sucking air into the system. HTH

Reason

Does your fan work? Is your thermostat opening?

hahagasdcrx

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hxdrt &raquo;</TD></TR><TR><TD CLASS="quote">Ok.. When I get done driving my car my coolant is boiling in the overflow.
I thought it was the headgasket, so I spent 8 hours to change my headgasket, and it still boils in the overflow...... My headgasket was indeed bad, because it burnt oil and coolant, and now it doesn't. But anyway, I flushed my coolant and added fresh and bled the system and filled everything up.

So why is my coolant boiling in the overflow???? What could it be? Thanks. Darrin</TD></TR></TABLE>

Usually caused by a stuck thermostat. Replace it and see how that goes.

RCautoworks

First off I highly doubt the coolant is actually boiling in the over flow tank so lets try to clear things up

Do you mean the coolant is boiling over into the over flow tank, or does the coolant in the over flow tank look like its boiling but its really just bubbles ?

Or is it actually boiling in the over flow tank ?

You might not have pressure in the coolant system, meaning your boiling point temp is not going up, so it might be a simple solution like the radiator cap.

hxdrt

No, my fan does not kick on. And I think my thermostat is opening because my car doesn't get hot... And yes it is actually boiling.. I made my friend burn his finger Another wierd thing is that when I am driving down the road and give it gas, my temperature gauge goes down (colder)... If I give it enough gas it will drop all the way below the C. Does this have anything to do with it?

RACINTWEEK

if your temp gauge moves like that you prob have air getting stuck on the temp sensor

hxdrt

Wheres my temperature sensor located?

manson

if your fan is not kicking on there is one problem. that is why at a stop your car will over heat...hence making the coolant overflow. once you start moving again the air passing through the radiator will cool the coolant and your temps will go down.

there seems to be a number of solutions for you... i suggest starting with the fan and then if the problem persists move to the thermostat, radiator cap and so on.

RCautoworks

Do you have the right coolant/water mixture in there ? Something is not right with your coolant mixture or your cooling system is not holding pressure

50% water and 50% antifreeze has a boiling point of 256°F* , the normal operating temps of our engines are between 160 to 180.

So check your mixture, and also check your radiator cap, if its not holding pressure it will lower your boiling point. Your suppose to change your radaitor cap about every 3rd oil change.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hxdrt &raquo;</TD></TR><TR><TD CLASS="quote">No, my fan does not kick on. And I think my thermostat is opening because my car doesn't get hot... And yes it is actually boiling.. I made my friend burn his finger </TD></TR></TABLE>

Something does not add up ? You say you coolant is boiling yet your car is not heating up ? And just because your friend burned his finger does not mean its boiling, if you stick you hand in anyones coolant while the car is on its gonna burn.

Reason

Run your fan directly to the ignition and take the thermostat out. If that doesnt help then i dont know what to tell you.

RCautoworks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reason &raquo;</TD></TR><TR><TD CLASS="quote">Run your fan directly to the ignition and take the thermostat out. If that doesnt help then i dont know what to tell you.</TD></TR></TABLE>

Yeah so his engine will run extremely cold and in the long run, ruin the cylinder walls.

l e o h j

if your fan isn't kicking in, or it takes a long time before the temp gauge goes up, it can be a faulty thermostat my fan wasn't kick'n on at all.. so i decided to check my thermostat and here's what i saw




as far as the coolant boiling in overflow goes, im having the same problem but im going to follow the other guys advice to buy a radiator cap. and see what happens

Blue Hybrid

the reason why the overflow tank boils is because the radiator cap is bad, its the only valve (the radiator cap is a spring loaded valve) between the pressurized cooling system and the overflow tank. when the temp of the liquid is 180 deg. fh. then it expands, if the radiator cap leaks or is too old (spring weakend) it leaks into the overflow, causing it to boil. easy fix $10. The Thermostat sticking may cause the overflow to boil, but thats because a faulty, stuck thermostat restricts flow, thereby increasing the temperature of the system, increasing pressure, forcing open the radiator cap, causing the overflow to boil. i would change both : ) (dont forget to get a new thermostat housing gasket)

Reason

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah so his engine will run extremely cold and in the long run, ruin the cylinder walls. </TD></TR></TABLE>

If you take the thermostat out it will run extremely cold. Ive had mine out for a while now and it has been running normal. And if he doesnt want to keep the thermostat out, he could just take it out for a couple of days to see if his temperature is going to stay at 180. At this point he doesnt really have anything to lose.

RCautoworks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Reason &raquo;</TD></TR><TR><TD CLASS="quote">
If you take the thermostat out it will run extremely cold. Ive had mine out for a while now and it has been running normal. And if he doesnt want to keep the thermostat out, he could just take it out for a couple of days to see if his temperature is going to stay at 180. At this point he doesnt really have anything to lose.</TD></TR></TABLE>

Yeah he could ruin the cylinder walls because of all the fuel he will be dumping in because the engine is so cold. Why not just find the real problem and fix it. Honda's and no cars are not ment to run with out a thermostat. Find the problem and fix it right. He should take the thermostat out and put it in some water to see if its working correctly, if it is put it back in. He also needs to pressure test his cap and get the coolant mix right in his system.

Reason

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah he could ruin the cylinder walls because of all the fuel he will be dumping in because the engine is so cold. Why not just find the real problem and fix it. Honda's and no cars are not ment to run with out a thermostat. Find the problem and fix it right. He should take the thermostat out and put it in some water to see if its working correctly, if it is put it back in. He also needs to pressure test his cap and get the coolant mix right in his system. </TD></TR></TABLE>

ok you're right on that.

more than likely its something minor that is making the car run hot, so just try the little things first like thermostat, fan, and radiator cap and go from there.

Blue Hybrid

oh another thing i thought of, your block isnt sleeved is it? cause if it is, youd need to drill 2 little holes in your thermostat to let it bleed, because sleeved blocks run hot, and it could cause heating problems. it happend to me ls vtec : P but now its fine