Bah. I've been dealing with an overheating/cooling system issue for a while now.
2001 civic EX coupe. 186k
Lets start with the radiator fans.
They don't work.
I replaced the cooling fan switch.
Since then I've been using this troubleshooting guide:
http://honda-tech.com/showthread.php?t=2889629
And stopped at step 8 - no continuity between #1 pin and ground. Haven't found the open in the circuit yet. For a short-term fix, I have left the jumper between the #1 and #2 terminals of the radiator fan switch which turns on both fans as long as the car is turned to Ignition (II).
That worked for a while.
But, now, I'm loosing coolant. I didn't have heat the other day which first gave it away. I put it in the overflow since the engine was hot and I didn't have time to wait for it to cool down. That stayed there and didn't go back into the radiator.
I waited until the engine was cold and added about a quart. (Total capacity is 4.2 quarts).
Now, every time I release the radiator cap, it makes a gargling sound and I have to re-fill it. So far, I've put about three quarts into the system in the last 5 days. Is this because I'm not bleeding it properly after adding coolant? (I just looked, and wasn't running the car to running temps with the cap on loosely after adding coolant).