1990’s Toyota Corolla. I was driving in San Francisco last month when I noticed a lot of fog. Well, being SF, I wasn’t surprised, so I continued along my merry way. The fog was so thick I had to turn the windshield wipers on! Then I noticed the fog was only in front of the car, not in the rear view mirror, or out the side windows! Back and side I could see miles. Front? 10 feet! Directional fog? Yikes!
Not being the sharpest tack in the drawer, it took me awhile, but eventually I figured out the fog was coming from the car, not the rarified SF atmosphere. The radiator had sprung a leak. Upon inspection, the top seam, where the plastic part connects with the metal, had come apart and leaking steam. Voila, instant fog.
I replaced the radiator and everything’s seems to be working fine. But I wonder why the radiator leaked in the first place? From the top of the radiator comes a plastic tube which goes to a plastic overflow bottle. There’s a T connection there on top of the bottle, so apparently if the overflow bottle becomes full, it won’t burst the pipes and radiator, instead the excess coolant will leak out onto the ground. It’s not supposed to ever beomce fully plugged in other words.
So I took off this tube from the top of the radiator, and I took the top off the coolant bottle, and blew into the tube, plugging the tube that otherwise extends into the bottle. Hard to explain. 3 connections to a T, right? Input, Overflow, and the one that goes into the bottle. I blew in the input side, plugged the one that goes into the bottle. I expected it would blow straight through to the overflow.
But no. It acted like it was plugged. I couldn’t blow hard enough to get any air to pass through to the overflow.
Is this normal, or could it be the reason the radiator blew out in the first place?