Question about 2000 Pontiac Sunfire

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Why is the coolant tank bubbling after a drive 20 miles

It runs a normal temp then rises a little at idle, but when stopped and engine off I can hear the coolant bubbling in the tank.

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  • Pontiac Expert
  • 328 Answers

Sounds like thermostat is starting to stick close replace thermostat

Posted on Feb 26, 2015

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

c17hydro
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SOURCE: 97 pontiac firbird, 3.8 v6 , 140k miles auto.

Front of the engine...looking at the motor...to the driver's side of the alernator...looks like a spark plug almost...has a wire connector going to it. Trying to post the pic...but at least this is a good description.

Posted on Apr 05, 2009

csmock132
  • 4669 Answers

SOURCE: 1995 Pontiac Grand Am SE runs hotter than normal

Everything you said is normal. It is common for these to hear coolant in the heater core, especially with a new one. There is a cure for it but it will make the heater not work as well. 200 coolant temp is normal. It is running at 170 with the air on because the fan is running. You can get a thermostat that opens at a cooler temp but the vehicle will run better and get better mileage at 195. Without the air on the fans will come on at 235. I don't see anything wrong.

Posted on Jul 04, 2009

SOURCE: 02 grand prix temp rises over 210 then drops back down. heater

dear friend-there is a couple of things you can do to find the problem,when the engine is cold remove the radiator cap start the engine then look inside to see if the water is circulating,all so look for bubbles in the water,if there is bubbles,you might have a blown head gasket,if there is circulation the water pump is ok,then get the engine up to working temp,then feel both the top and bottom radiator they should be the same temp,if not then the termostat is at fault

Posted on Nov 04, 2009

  • 451 Answers

SOURCE: Overheating

maybe 3 things....leaking intake manifold gasket(very common on this car because pontiac used plastic manifold gaskets) may also be air in the system....bleed screw is located on the top hose and is painted blue. it may have some air cavitation. you may have a leaky or bad seal on overflow cap. check your oil dip stick...if there is a milk shake type foam look to it then the gaskets are ready to fail. get a compression test done and it will confirm everything the easy way. harbor freight sells a radiator pressure test kit and it works like a champ and its cheap....good luck

Posted on Jan 13, 2010

rokinroj
  • 10 Answers

SOURCE: code 15 coolant tempeture system where is sensor

CODE 15 - Engine Coolant Temperature (ECT) Sensor Circuit (Low Temp.)
It's no surprise that your mileage was affected, damage to the ECT sensor will affect proper operation of the fuel injection system.
41877841

REMOVAL


  1. Relieve engine coolant system pressure.
  2. Turn ignition to "OFF".
  3. Disconnect electrical connector.
  4. Carefully back out ECT sensor.
INSTALLATION


  1. Coat threads (only) with sealer.
  2. Install sensor in engine, torque to 30 N-m (22 lb.ft.).
  3. Connect electrical connector.
  4. Refill lost coolant.

Posted on Feb 23, 2010

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1 Answer

My 2008 hhr ss temperature goes from 196 to 210 on the road. Can I drive 1001 miles? While driving the coolant system goes down and then goes up when it's parked. Is it good or bad idea?


I'm fairly sure what you described is normal operation.
The thermostat opens at 195-197 degrees and the radiator fan kicks on around 225 degrees. So the normal range is between those numbers. And the coolant tank would rise when you turn the engine off because it stops flowing.
As long as the temp stays under 220 and you are not losing coolant you should be ok.

Apr 04, 2016 | Cars & Trucks

1 Answer

My radiator has coolant bubbling out of the upper corner sort of where it connects to the upper hose. Is there a gasket or oring there? Does bubbling mean there's air in the system?


Your radiator has got a damage. For a short term you can use liquid rad seal; but is to be repaired/replaced. When engine/coolant temp is rising volume/pressure is rising too, excess usually goes to expanding canister, but since there's a hole in rad, it gets spewed out.

Jun 11, 2015 | 1996 Chrysler Concorde

1 Answer

Toyota LiteAce dx 1994 , can hear bubbling sound after engine running


this is probably from a boiling of the coolant after the engine has stopped . It most likely is because the viscous fan hub is shot and not spinning the fan correctly at idle and so the temp goes up. It is a common problem with viscous fan hubs as they spin the fan but there is no drive action to pull th air through the radiator. You will not notice that it is not working while driving because the air flow is sufficient but at stop lights or when idling the temp goes up.

Dec 12, 2014 | Toyota Cars & Trucks

1 Answer

Would a loose overflow tank cap cause the coolant to come out?


of course it would . they run a closed system to cool properly

May 26, 2017 | 2000 Dodge Intrepid

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I have a 96 Monte Carlo and it's overheating. The


Replace the thermostat. After that, if problem persists, feel the radiator with engine at normal operating temp. If part of it feels cool, this would indicate a restricted radiator, Very common.Also purchase a block tester, available at napa or other reputable parts store for about thirty dollars. Follow directions, cheapest way to find head gasket breech into cooling system. Good luck!

May 12, 2011 | 1996 Chevrolet Monte Carlo

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My temp gauge goes to the third line before fans come on and only the low fan comes on. I already replaced thermostat, engine coolant temp. sensor and radiator flush... any idea why high fans dont come on...


CHECK COOLANT FAN FUSES AND RELAYS. CHECK COOLANT LEVEL.MAKE SURE ITS NOT TOO LOW BECAUSE IF COOLANT TOO LOW . BY NO COOLANT AROUND OR COOLANT SENSOR NOT SUBMERGED IN COOLANT COOLING FANS WONT TURN ON.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER. CHECK FOR CLAPSE RADIATOR HOSES.CHECK RADIATOR HOSE AT WATER PUMP.IF HOSE LOOK CLAPSE REPLACE IT AND BLEED COOLANT SYSTEM.IF EVERY THING HAS BEEN DONE YOU NEED ENGINE BLOCK FLUSHED OUT.HEATER CORE ALSO COULD BE STOPPED UP.A VERY HIGH MILEAGE ENGINE WILL OVER HEAT.OLD ENGINE LOSES COMPRESSION AND HORSE POWER.PUTTING MORE LOAD ON THE OLD ENGINE WILL MAKE IT OVER HEAT.IF COOLANT LEVEL IS LOW.BLEED COOLANT SYSTEM.START THE ENGINE LET IT IDLE FEW MINUTES WATCH THE COOLANT TEMPERATURE GAUGE.WHEN TEMPERATURE START RISING.TURN OFF THE ENGINE LET IT SET FOR 20 MINUTES.TAKE A LARGE RAG PLACE OVER RADIATOR CAP ON COOLANT EXPANSION TANK SLOWLY OPEN RADIATOR CAP JUST A LITTLE TO RELEASE A LITTLE PRESSURE AT A TIME.DONT OPEN CAP RAPIDLY OR YOU WILL GET SCALDED.ONCE THE RADIATOR CAP REMOVED.IF COOLANT LOW ADD MORE COOLANT IN THE THE COOLANT EXPANSION UNTIL YOU GET TO THE COLD MARK.REPEAT THIS PROCEDURE START ENGINE LET IT RUN UNTIL TEMP GAUGE START CLIMBING A BIT DONT LET CAR RUN TO OVER HEAT JUST IDLE UNTIL TEMP JUST START TO RISE.THEN YOU TURN OFF ENGINE. WAIT 20 MINUTES.THEN USE LARGE RAG OPEN RADIATOR CAP LITTLE AT A TIME. DO THIS PROCEDURE UNTIL THE COOLANT IN THE EXPANSION TANK STOP DROPPING. THEN ALL THE AIR IS BLEED OUT THE COOLANT.WHEN COOLANT LEVEL STOP DROPPING, WHEN YOU DRIVE CAR AROUND.AND TURN OFF ENGINE.WHEN ENGINE OFF CAR SET FOR A WHILE KEEP CHECK ON THE COOLANT LEVEL IN COOLANT EXPANSION TANK. THE COOLANT LEVEL SHOULD BE AT THE COLD MARK IN THE EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK.IF NOT AIR WILL DRAW IN COOLANT SYSTEM. CAUSING ENGINE TO OVER HEAT.IF BLEEDING AIR OUT THE COOLANT SYSTEM DONT HELP AND COOLANT FANS DONT TURN ON YOU HAVE PCM PROBLEMS.

Apr 22, 2011 | 2004 Pontiac Grand Prix

1 Answer

It overheats went idling at a light. temperature gage rises. when I check the coolant level in the store tank it overflowed. I checked the level in the radiator when it cool down you can see the tubes. I...


Check that the fan is working. You do not give a make or model, so it could be the thermostatic switch, fuse or relay for an electric fan or the viscous clutch if it has that type of fan. If the water bubbles out or you see bubbles either in the radiator or the overflow, you might have a head gasket leaking into the coolant system.

Apr 01, 2011 | Honda Civic Cars & Trucks

1 Answer

My coolant expansion tank is overflowing after 20 minutes running


There could be a couple of reasons for this,

1. The thermostat could be stuck closed creating more pressure than normal. Your temp guage would show a higher temperature or you have another blockage in the system.
2. The expansion tank is too full.
3. The cylinder head may be leaking. If you fill the system run the engine to normal temperature with the radiator cap off, look for quite large bubbles coming out of the filler cap. If the head is badly leaking, they can be like a volcano. The temp will rise quickly from cold and the engine will overheat in a short distance.
It does seem odd that it would only spill over after 20 mins. Suspect that the expansion is over full first if your temp is normal. Let it run until it stops and see where the level is when the engine is cold.

Feb 17, 2010 | 1996 Mercury Sable

4 Answers

Air bubble in coolant.


Replace the thermostat. That is the only cause of the bubbles.

Jan 02, 2010 | 2002 Chevrolet Impala

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