Question about 2003 Honda Accord

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Engine idle is high and after app 3or 4 mins the idle will be up and down. Anywhere from 3000rpm down to 8 0r 900 consistently. When trying to diagnose the problem had noticed coolant was not circulating. Top hose was hot while bottom was cold. Installed a new thermostat and still no circulation. Vehicle was a salvage rebuild with sheet metal damage only.

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  • 68 Answers

Check the radiator lower hose if its still cold after 5 or 10 minutes then have a restricted radiator, or water pump not circulating

Posted on Oct 21, 2013

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Posted on Jan 02, 2017

  • 126 Answers

SOURCE: 1995 honda passport i have installed 2 thermostats

is the temp gauge getting hot as you drive the vehicle or does it remain at a constant temp? if no problem in coolant temp getting too hot (and overheating), then it should not be an issue.

you're sure radiator is filled with 50/50 mix of coolant & water to the top of the cap? if there's an air bubble trapped it could cause a problem. some cars have to be "burped" after refilling with new antifreeze.

if, however, its overheating, then i believe your radiator may be clogged preventing the coolant to flow across the radiator fins and cool properly.

try this. warm the car up (not the point of overheating, but hot enough for the t-stat to open), turn it off, make sure the electric fan is off (or unplug it is so equipped), then run your hand across the radiator. it should feel warm. if you feel cold spots, then that portion of the radiator is clogged preventing flow. new radiator is now in order.

hopefully its only a clogged radiator and not a clogged engine block.

hope this helped.

Posted on Feb 22, 2009

  • 1 Answer

SOURCE: car over heats

Check the fan and water pump are working. Check the thermostat if it has en electrical connection. It may be malfunctioning and keeping it closed always. The thermostat should open and close due to temperature changes. Good luck.

Posted on May 20, 2009

Mustgo
  • 2359 Answers

SOURCE: 1991 honda accord is overheating. Installed new

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.

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Posted on Dec 05, 2009

  • 103 Answers

SOURCE: Heater does not get hot, water does not appear to

the car has not enough time to reach operating tempature

Posted on Jan 02, 2010

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