Overheat???

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m90polk

New Member
I recently bought a '00 civic coupe, and just today while sitting in traffic for around 30 minutes the antifreeze started to boil in the reservoir (only about 60 outside). So I pulled over turned the car off an noticed that it boiled for about 5 more minutes until it stopped. I thought maybe the person I bought it from may have put water in the antifreeze an diluted it lowering the boiling point or maybe the fan wasn't cycling on (I don't remember if it turned on I was to annoyed at traffic).
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Anyways the car temp gauge was not even at half way and I normally drive 30 miles a day on the highway and never have a problem and no it's not blowing white smoke. Both the hoses were hot so I know the thermostat works and the hoses are fine. So I'm wondering what do you guys think it is? I'm going to check the fan tomorrow and the relay an fuse to make sure that is cycling on and hopefully the world doesn't end on Saturday :D so I will be able to look at it more thoroughly. Any input is greatly appreciated.
 
I say fan because you were sitting in traffic. But.......you say it was wicked hot and the temp gauge didn't relay such a message??? This puzzles me......:shrug2:

Both hoses are hot......are they hard? Clog......???
 
I say fan because you were sitting in traffic. But.......you say it was wicked hot and the temp gauge didn't relay such a message??? This puzzles me......:shrug2:

Both hoses are hot......are they hard? Clog......???

no they aren't hard or old and they aren't clogged that's one of the first things I checked for.....I'm gonna check the fan tomorrow and it's circuit... I also read elsewhere that bubbles in the coolant means the head gasket could be cracked but I don't think it's that or else it would do it all the time
 
i doubt its a overheating issue, if your ect sensor was showing a raise in temprature from cold then it wouldn't stop (unless theres some rigged street tune). First think i would do is bleed it out. Make sure the coolent is toped off then open the bleeder on the thermostat housing. Cause the bubbles are prob just air escaping. if your lucky
 
see... here's the deal... if it is in fact a busted head gasket... then chances are there wasnt any coolant to read, because the bubbling you heard was air in the system... you should have revved it up and watched the temp gauge to see if it fluctuated, all while having the heater at full blast... before you checking out electricals, check the mechanicals...
 
see... here's the deal... if it is in fact a busted head gasket... then chances are there wasnt any coolant to read, because the bubbling you heard was air in the system... you should have revved it up and watched the temp gauge to see if it fluctuated, all while having the heater at full blast... before you checking out electricals, check the mechanicals...

Well I think there is coolant in the system because the other day I was stuck in stop an go traffic for three hours in Boston an had no problem. Not to mention if there was very little coolant the engine would be very quick to overheat which it hasn't as far as I've noticed. But I will definitely check it out an see if the gauge fluctuates or if there is still air in the system....an then check the electrical to
 
Bad thermostat ?? or low coolant.
 
It has enough coolant an thermostat is good ....I was also thinking maybe the radiator cap may be bad
 
^^^ might be rad cap. I say you bleed it again too......
 
Just my two cents,but is it boosted and is the turbo close to the radiator? because on mine the the turbo is awfully close to the radiator and while sitting in traffic it just cooks the water to boil over. i need to relocate the radiator away from the turbo so if thats not it i say drill out the thermostat and double check the fan.
 
Found out the problem was the temp sensor as soon as I replaced it fan finally turned on an no problems since
 
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