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1994 honda accord, my coolant is bubbling and leaking from the overflow resevoir. should i replace the cap? what should i do?

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Natalie, replacing the cap may be just a temporary fix at best, as the coolant shouldn't be boiling. I suspect the engine's thermostat has failed and needs to be replaced. You also want to be sure that you have enough coolant in the radiator and it's the proper antifreeze to water ratio. DO NOT try to remove the radiator cap, until the radiator has cooled. Once it has cooled and you remove the radiator cap, look at the coolant in the radiator and on the underside of the cap. Does it luck rusty and like old coffee grounds? If it does, 9 times out of 10, the radiator is clogged and needs to be flushed and cleaned and new antifreeze installed. If it's to severe, the radiator will need to be replaced.

Hope this helped steer you in the right direction to troubleshoot the problem and please don't forget to rate my answer to your problem. Thanks!!

Posted on Mar 26, 2011

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Gs300 coolant is bubbling in resevoir,but temp is fine ?


Get coolant temp sensor checked.

Get the coolant pressure tested, its definitely leaking coolant. You will need to get the coolant running line.


Pressure test will help you to know from where exactly coolant/refrigerant is getting leaked.

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For complete step by step troubleshooting i suggest you to go through the help links mentioned below :----

Click the link below :-----


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Nov 28, 2012 | 1994 Lexus GS 300

1 Answer

IT KEEPS OVERHEATING


REPLACE THE THERMOSTAT AND RADIATOR PRESSURE CAP.IF COOLANT LOW, ADD MORE COOLANT THROUGH COOLANT OVERFLOW UNTIL COOLANT LEVEL IN THE COOLANT OVERFLOW STAY AT FULL COLD MARK.REASON POUR COOLANT THROUGH COOLANT OVERFLOW MOST GM CARS DONT HAVE RADIATOR CAP.WHEN YOU GET COOLANT LEVEL OKAY, CRANK CAR LET IT IDLE UNTIL ENGINE GET HOT BUILD UP PRESSURE THEN TURN OFF CAR.CHECK FOR COOLANTS LEAKS AT THE RADIATOR HOSES,CHECK FOR LEAKS AT THE RADIATOR, CHECK FOR LEAKS AT WATER PUMP WEEP HOLE IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. IF CAR OVERHEATING WHILE IDLING YOUR COOLING FANS NOT WORKING CHECK COOLING FANS FUSE AND RELAYS.IF FUSE AND RELAYS OKAY THE ENGINECOOLANT TEMPERATURE SENSOR BAD.

Aug 01, 2011 | 1994 Cadillac DeVille

1 Answer

Honda accord v6 air bleed valve, where is it


After 1995, Honda stop using the coolant bleed screw.

Just run the engine with radiator cap off for 30 minutes, keeping the
coolant level topped of.

You should hear the fan come on 2-3 times.

Replace cap and make sure overflow tank is at "hot" level.
Hope this helps, James Booth

May 17, 2011 | 2000 Honda Accord

1 Answer

My 1998 Honda Civic EX 2 Dr coupe constantly overheats. We have tried boring out the thermostat, and replaced the radiator cap which helped somewhat. It keeps blowing the lid off of the overflow resevoir...


Cracked Cylinder head or cylinder head gasket blown. Bet you filled it up with cold water when it was hot! Check your oil level, see if it is going up (water getting in) Remove the rad cap start your engine and if it blows the water out then i'm probably right.

Feb 02, 2011 | 1998 Honda Civic

1 Answer

Overheating bubbleling in resevoir


bubbling into the overflow may mean a head gasket is gone, it may also mean the radiator or thermostat is blocked. or there is a leak
Clean and flush radiator, check the radiator fins for corrosion
pressure test coolant system
(if this is ok then)
new thermostat
new coolant

May 09, 2010 | 1994 Pontiac Bonneville

1 Answer

1992 Honda Civic over heating replace theormostat - still overheating air bubbles in overflow jug and in radiator when running with cap off...


here is a check list for common overheating issues low coolant? Any leaks? A headgasket leak? To test that use a coolant mix tester. Do the cooling fans run with the engine hot? Is the rad cap holding pressure? This can be tested usually its easier to swap it with a working one or buy new. Lastly the waterpump and timing belt. If the timing belt if old/high mileage or the tensioner faulty it can cause overheating. The common practice is to replace the timing belt every 100,000miles along with the waterpump and the belt tensioner

Dec 28, 2008 | 1991 Honda Civic

1 Answer

Coolant filling up overflow bottle and not returning Started intermittently No coolant leaks Changed Hoses Cap Thermostat Cooling system has always had good quality coolant and is clean inside...


You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

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