What causes the coolant in the reservoir to bubble??? and the temp gauge goes up and down rapidly...when stopped it shows hot but when i take off it goes to normal...but the car isnt really overheating...having to fill up radiator constantly...have already changed all radiator hoses and cap and thermostat...
I'm voting for blown head gasket. An auto shop (maybe a parts store?) has a test strip that will show up combustion gases in the radiator. You might be able to do a sniff test and detect an exhaust gas smell.
hi my name is brad i see you are haveing a problem and i think i might know the problem. if you have done all of that to your car and it still over heating you might have a blown head gasket one way to check is to pull your thermostat out and fill your coolant leaving the cap off then start you car let it rrun a few minutes and if you see bubbles the radiator its the head gasket even though you wont have coolant in your oil or out the tail pipe. if you check that and ther is no bubbles i have one other spot for you to check ( dont know if you have the 1.5 or 1.6 sohc ) but if you have the 1.6 sohc with the mpfi you should check on the throttle body at the idle air control valve(IAC) you will see two small line`s that have coolant some times on hondas with high millage the line will fill with crud and that can cause a problem.. if you have any other honda needs please let me know
Brad Ross
SOURCE: My heater went from hot to cold
either you have a air pocket in the cooling system or the engine got to hot and hurt the head gasket .while engine is cold check level if low fill up slowly if full start car with radiator cap off is coolant spews out of radiator then look to the head gasket remember coolant should me cold!!
SOURCE: Overheating
Usually when the temp Gauge fluctuates like that it could be the sending unit has taken a lunch break. First thing do a wiggle test to see if the Gauge moves. Wiggle the wires at the temp gauge sensor should be located at or around the thermostat if the gauge moves replace sensor. Make sure cooling fans are coming on, if not disconnect sensor, if fans come on, bad sensor. If fans stay of bad fan. If all this fails then you will probably have to start looking at water pump. Common cause for failure if nt leaking, rusted impeller due to use of water instead of antifreeze.
SOURCE: overheating?
The other thing you need to know is this: it may be time to replace your radiator or suffer the expense of a new head gasket if you dont. The tubes within radiators become clogged with age. Corrosion particles lodge themselves in the tubes over time and cause them to clog. The result is that tube no longer has coolant running through it to be cooled so the 'work' of cooling is left up to the remaining tubes. The more tubes that become clogged with age, the less efficient the radiator is in lowering the coolant temperature. WORSE STILL, this clogged tube phenom can also result in blowing head gaskets. Here's how. If you poured water into a section of pipe it would run out the other end as quickly as you poured it in. If you partially cover the end as you pour water in the top, the water does not escape as quickly as you are pouring it in, so it eventually overflows out the top as you continue pouring water in. This is what happens in your radiator, except, the water is being 'pushed' through the radiator by your water pump and because it cant exit the radiator as quickly as its being forced into it, the water pressure builds up between the pump and radiator. In between this pressure zone is your head gasket, usually the weakest pressure zone, meaning, its what gives first. The reason the water doesnt just exit through the presssure cap of the radiator is because the pressure within the radiator itself is not as great as the pressure zone created by the pump within the head. The pressure exerted on the water is greater because it is in a more narrow passage than the pressure being exerted on a larger area within the radiator. Sounds confusing I'm sure, but trust me on this. Few mechanics learn this until they replace a head gasket or two only to have them fail again within a short period of time because the radiator was never replaced!
SOURCE: 1998 Civic. Engine ran hot, now won't turn over.
sounds like a bad head gasket. Check the oil and look for foam to tell if antifreeze is getting into engine block.
Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.
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