1989 Honda intermittent cooling problem.

I have a 1989 Honda Accord LXi with an intermittent cooling problem.

Gage .. generally stays the halfway mark but out of the blue starts climbing to HOT .. may be hot foe 15 seconds then back down below the halfway mark on the temp gage .. then go back up .. after a while goes up and stays up at HOT.

Fan runs when AC is on (but car still runs hot even when fans are on)… does not run otherwise.

When HOT and I cut the car off and open hood even though the fans aren’t running I can hear a humming coming from back of engine close to firewall.

Just paid $187 to get fixed .. they replaced sensor and thermostat .. worked great for one day then started doing the HOT bit again.

??????? HELP !!!!!!!!

Any and all help will be greatly appreciated.

Naive1@comcast.net

There might be air pockets in the cooling system. There is a bleeder screw at the top the thermostat housing. At least on my 95 and 99 LX. Open it up and try to add some coolant to the radiator. You should see a solid flow from the bleeder screw.

Another method that I know is to park on the hill nose up with the radiator cap removed and run the engine, slowly adding antifreeze.

Good luck,

Sam