car temp is hot antifreeze boiling over from the overflow tank

Posted in the Chevrolet Cavalier Forum

justin

AOL

#1 May 12, 2008
need help is it the water pump or the thermostat
justin

AOL

#2 May 12, 2008
car temp is hot the antifreeze is boiling out of the overflow tank is it the water pump or the thermostat
robert

Plant City, FL

#3 May 26, 2008
did you relieve all the air out of the system, there`s vent if you ever drain it you must let all the air back out.... bobcat30rg@yahoo.com
chris

Saint Paul, MN

#4 Jun 11, 2008
look around your waterpump from underneath to see if there is any antifreeze around it
Dave

United States

#5 Jul 9, 2008
Make sure the coolant fans are turning on, if the fans aren't cooling the engine, the antifreeze will boil and soon rise over the overflow tank
AliusV2

Madison, AL

#6 Jul 13, 2008
There's a lot of things that can cause overheating. The thermostat could be stuck, the heater core could be gunked up, or the water pump could be going bad or is bad already. If it is overheating very quickly then you need a water pump most likely. The best thing to do is flush the system and look for rust. If you put a water hose in the top of the radiator and run it with the car running then you can see for sure if the the thermostat is stuck. Keep in mind that taking the goose neck off and looking at the thermostat is a more reliable method. If you have flushed your system and the thermostat is okay then you need to look at your heater core. They clog fairly easily if the coolant system hasn't had the right anti-freeze/water ratio.
tony

Corpus Christi, TX

#7 Dec 20, 2010
chris wrote:
look around your waterpump from underneath to see if there is any antifreeze around it
what if there is?
Sarah

Seattle, WA

#8 Sep 12, 2011
I have the exact same car and the exact same problem. The thermostat definitely isn't stuck, and it takes a long time to overheat.
It usually doesn't overheat unless I've been on the freeway or a very fast road for a good while and then either get off into the city traffic or hit stop-and-go traffic on the freeway, so I don't think it's the water pump. That would cause it to overheat very quickly basically any time the car is on, wouldn't it?
I don't know where to look for a heater core, or what to look for.
What I usually do is stop, turn the car off, pop up the hood, make sure it has enough antifreeze, and then pour a half gallon or so of water directly over the radiator (without opening it of course, as this can cause very severe burns). The radiator evaporates the water, cooling it off just like when a person sweats, and within a couple minutes, I'm good to go.
Jennifer

Maidens, VA

#9 Dec 3, 2011
I have a 93 Dodge intrepid. I replaced thermostat, housing,waterpump. heater core is ok. But overflow tank still pukes when car comes up to temperature.
I usually have to put a gallon of water in it each time it does this. Is my radiator clogged? Looks like
Previous owner may have put stop leak in it before.
No steam coming from exhaust.
Bob

Denver, CO

#10 Mar 12, 2012
Who care take it to the pro and pay dod
mart

UK

#11 Oct 7, 2013
Coolant bottle is boiling and bubbling ...is it an air lock?
AliusV2

Johannesburg, South Africa

#12 Mar 26, 2014
AliusV2 wrote:
There's a lot of things that can cause overheating. The thermostat could be stuck, the heater core could be gunked up, or the water pump could be going bad or is bad already. If it is overheating very quickly then you need a water pump most likely. The best thing to do is flush the system and look for rust. If you put a water hose in the top of the radiator and run it with the car running then you can see for sure if the the thermostat is stuck. Keep in mind that taking the goose neck off and looking at the thermostat is a more reliable method. If you have flushed your system and the thermostat is okay then you need to look at your heater core. They clog fairly easily if the coolant system hasn't had the right anti-freeze/water ratio.
..i suppose i need to buy a new water pump cos mine boils in a matter of minutes. But if its got rust, should i clean it and will it be fine?
raath75

Norwich, UK

#13 Jun 24, 2014
I have a golf tdi 1.9 and the car does not over heat or have any mix of oil in the water and heater is working just fine but every few days I have to add more water to my coolent bottle as its over flowing but I all ways fill it to the MAX mark on the side of the bottle so its not over full ...do I have a stuck themalsat

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