Quote Originally Posted by hondapop View Post
Did you bleed the system of air when you replaced the thermostat? You could have a big air lock (bubble) stopping the flow of coolant. The bleeder nipple is situated on top of the extension that the thermostat is at the end of, directly below the distributor. It faces back towards the firewall and is looks like a 12mm nut with a short "spout" where a stud would otherwise be. Unscrew it completely and clear the small passageway in it's seat with a piece of 1.5mm wire. Do the same to the bleeder, including the little hole in the side at it's tip. Water should come out of the hole it screws into. Screw the bleeder back in, but leave it loose a turn. Take off the radiator filler cap and fill it up. Start the engine and watch for water coming out of the bleeder, run the engine at about 1500 RPM until no more air is coming out (continuous water stream). Top up the radiator as you go if necessary. Shut the bleeder off while water is flowing out of it. Give your car some more road testing. If this doesn't cure the problem, I would say you've either got a blocked radiator or the water pipe across the back of the engine, or the pump isn't working. Take off the top hose at the radiator and run the engine to test the pump. Water should flow out very freely. Stop the engine before you empty all the water. If all OK and the problem continues, it's the radiator or that back pipe. Always use the correct anti-corrosive coolant once it's fixed after a flush out.
I did not bleed the air when I did the thermostat.

Last night I bled the nipple and as soon as I cracked it I heard air expel out for about 5-10 seconds. You could hear it. I cleaned the nipple and where you put them nipple (as you said). The nipple was blocked. I then put the nipple back on and ran the car for a few seconds and had a constant stream of water come out. I tightened the nipple and that's it !

I hope this is the cause of the problem. Do you think I will need to do it again or once should be enough ?
I'll hold off from replacing the coolant for now until I can determine whether this has fixed my problem. It's interesting that this issue has never happened before. I drove the car to the inspection agency and did the exact same route twice before and had no symptoms. It ran like a champ... through peak hour too !

Thank you for your help