Question about 1997 Honda Accord

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97 Honda Accord running hot. The water seems to be boiling into the plastic bottle. The water disappears in the radiator after a couple days. I am thinking thermostat.

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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.




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!

Posted on Dec 05, 2009

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I would Agree, the thermostat would be my first choice, change it out and if the issue persists, check the radiator cap pressure or the cooling fans connections. I hope this helps, thanks

Posted on Sep 28, 2009

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Don't drive it anymore until you diagnose it, there can be some serious damage from overheating it repeatedly. Could be the thermostat, also check behind your driver's side front tire area on the block to see if your water pump is leaking. If you don't have a garage, set some cardboard under your car in that area to see if it leaks on it over night after you fill it up with water. There is a weep hole on them that will release coolant when the bearing fails. It's located behind the lower plastic cover on the driver's side of your engine under the motor mount. If it is the water pump, have the timing belt changed while they are in there.

Posted on Sep 27, 2009

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