Question about 1994 Toyota Corolla

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My 94 corolla keeps running hot and i just changed the thermostat and put more coolant in the radiator

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You may have an air lock in the water jacket and it needs the air blead out if you blead it and its still running hot the head gasket may be leaking?

Posted on Apr 27, 2010

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Bleeding cooling system


sounds like air in system ...
Leave the radiator cap off, turn the engine on and let it run until the radiator "burps": You will see the coolant level drop and may see or hear a large air bubble come to the top as the system burps.
Keep an eye on the temperature gauge throughout this process

  • Refill the radiator to the top and coolant reservoir as needed. Put the radiator cap back on. Note that if the engine runs hot after this procedure there may have been another pocket of air that "burped." Let the engine cool down and then add more coolant to both the radiator and the coolant reservoir.
  • Apr 18, 2013 | 1998 Chevrolet Cavalier

    1 Answer

    Car over heats within 30 min. after starting


    Thermostat is bad or the head gasket is blown, Test on cold engine, first remove radiator cap, start engine and observe coolant in radiator, you should not see any air bubbles being produced by the engine as it warms up, some coolant may slosh out so locate a drain pan under car to catch any overflow, keep pets away from coolant!
    If air bubbles are present the head gasket is suspect, further testing with a cooling sytem pressure checker is required to confirm the diagnosis. I had a 22RE in a 94 Toyota Pickup that had a warped block causing a blown head gasket. Not a cheap repair if it is.

    Bad thermostats do not let the coolant into the radiator hence the engine will be hot but the radiator will feel cold when running.

    Be careful with radiator caps, never remove one while the engine is hot, scalding is a most unpleasant experience.

    Nov 07, 2012 | 1988 Toyota MR2

    1 Answer

    94.lexus ls400- keeps pushing radiator coolant out of overflow,


    Your radiator could be glogged and causing it to back up out of overflow,drain coolant,if still good,save and remove bottom hose from radiator get hose and insert in radiator and let run and see how flow is,if clooged,go to autozone and tell them what is happening and they will get you what you need to unglog .To check water pump,unscrew radiator cap and put over opening,crank engine,let it get at operating temperature,remove cap and check flow.Click on link to view radiator flush. http://www.autozone.com/autozone/accessories/Fluids-and-Chemicals/Radiator-Cleaner-and-Additive/_/N-262g?filterByKeyWord=radiator+flush&fromString=search

    Oct 20, 2012 | 1994 Lexus LS 400

    2 Answers

    Toyota 2001 corolla running very hot.


    suspect thermostat or leak on coolant system

    Aug 12, 2012 | 2001 Toyota Corolla

    1 Answer

    My 94 Taurus is running hot I have already changed the water pump, thermostat, upper radiator hose, and radiator fan motor, any suggestions on wat it might b


    Could be clogged up radiator. Does the fan motor kick on once gets hot? They have a relay that sometimes will go bad. Good mixture of coolant is important also, If just water, it could be boiling out the overflow once gets hot. Radiator Cap could be losing pressure causing to overheat. If none of those resolve issue, it could be internal leak which usually means head gasket

    Aug 12, 2012 | Cars & Trucks

    1 Answer

    94 camry xle 6cyl changed thermostat changed hydraulic fan new radiator cap and new coolent and it still overheats once the guage reaches a little over half way then it gets hot real fast what do i do


    Softly418 had this problem...........

    This could result from a thermostat which is stuck closed (but you have a new one), or a failed coolant temp sensor not allowing the radiator fans to run when they should, but I think you have a blown head gasket. Overheating is a classic sign of combustion gases getting into the coolant. The pressure also forces it out of the overflow.

    Warm up your engine a little, about half, and remove the radiator cap by putting a towel over it first. Then let the engine keep idling until hot while you look down the filler neck into the radiator......carefully.

    If you see white bubbles like dry ice, that is a failed head gasket. If not, have a mechanic do a test for combustion gas in the coolant with a gadget like this

    http://www.youtube.com/watch?v=1_SIwHMLmkM

    May 26, 2012 | 1994 Toyota Camry

    1 Answer

    HIGH TEMPERATURE OVER HEATING, DESPITE 4E ENGINE CHANGED, NO THERMOSTAT USED, RADIATOR HAS NO LEAKS EITHER, ALL HOSES GOOD.


    After it's hot ,shut it off and see if the bottom of the radiator is colder than the top(on the core fins ) if they are colder at the bottom the radiator is plugged up.May as well replace it.
    Also,the car will run a bit hotter without the thermostat because the coolant flows too fast to give the radiator time to cool it.
    The thermostat controls the minimum temp not the max.

    Apr 07, 2011 | 1994 Toyota Corolla

    1 Answer

    CAR RUNNING HOT AFTER I CHANGED A BAD RADIATIOR OK RADIATIOR HAD A WHOLE IN IT WE CHANCED IT BUT NOW ITS RUNNING HOT HOW DO I PROPERLY REFILL THE RADIATIOR


    CHECK COOLANT LEVEL STILL LOW.ADD MORE COOLANT.UNTIL RADIATOR OVERFLOW FULL AT COLD MARK.THEN CRANK ENGINE UP LET IDLE FEW MINUTES LOOK DOWN COOLANT OVER FLOW JUG ADD MORE COOLANT IF LEVEL DROPPED.WHILE ENGINE RUNNING KEEP EYE ON TEMPERATURE GAUGE.WHEN THERMOSTAT HOSE GET HOT.TURN OFF ENGINE WAIT A LITTLE WHILE TO KEEP FROM GETTING SCALD TAKE LARGE RAG PLACE OVER OVERFLOW JUG RADIATOR CAP.OPEN CAP A LITTLE A TIME.IF COOLANT TRIES BOIL OUT.LET VECHICLE SET A WHILE LONGER.ADD MORE COOLANT.WHEN COOLANT LEVEL CORRECT AND ALL AIR OUT THE COOLANT SYSTEM.IT WILL STOP OVERHEATING.LONG AS ENGINE RUNNING HOT TURN OFF THE ENGINE POUR IN MORE COOLANT UNTIL COOLANT LEVEL STOP DROPPING IN RADIATOR.KEEP COOLANT LEVEL IN OVERFLOW AT COLD MARK.DONT OVER FILL OVERFLOW JUG.

    Jan 23, 2011 | 1996 Lincoln Continental

    4 Answers

    My 1994 Acura Legend keeps running hot. Gauge


    When the car is completely cool,check the electric fan(s) for smooth rotation.

    Clean/check/change the thermo sensor,contact and wire.

    ===

    Excavate air pocket in coolant system / check for head gasket leak

    This test will kill two birds with one stone.

    ===

    MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

    RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

    You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

    ===

    Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

    Top of the coolant reserve tank

    Let it ran for 10-15 minutes.

    Monitor for air pockets escaping from coolant reserve tank.

    Small amount of bubbles is OK at 1-5 minute mark

    After the thermostat open up (after 195 F warm up) at
    5-12 minute mark or after high idle you should see less bubbles.

    If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

    Give the thermostat host few gentle taps.

    If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

    Let engine cold down and top off coolant reserve tank.

    Start monitor for coolant lost

    ===

    A coolant flush is require every 2 years or 24,000 miles.

    I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

    Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

    ===
    Please post more information by clicking the comment link on the top right corner.

    DON'T FORGET to RATE ME if my tip is helpful to you!

    Nov 18, 2009 | 1994 Acura Legend

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