No Coolant bleed necessary?

I just replaced the o-ring on my coolant temp sensor this morning. As I have read in posts I kept the cap on and everything tight to keep the system pressurized. Maybe a cup of coolant came out - not much. Replaced sensor topped off the system a bit. Drove it around to operating temp, no leaks, and the needle stayed at dead center. Drove into work this morning and same thing.

Did I luck out and not introduce any bubbles? do I not need to bleed?

Also, I figured instead of spending $20 bucks on a gallon of coolant when I won't use hardly any of it, I spent $10 bucks and got Water Wetter. All I had to add was the small bottle of water wetter and maybe a cup of distilled water.

I know from the threads that you won't see much of a difference with water wetter in our cars, but I still figured it might be a tick lower on the gauge as I have seen some post. This causes me to think maybe I do have a few bubbles?

Dang, I'm striking out on this forum! 2nd post that is getting no love.

Can someone please help me out here?

I have searched many times here and on google and can't find the answer. When doing this procedure is it possible that a bleed is not needed?

Please refer to my original post way up 2 spots and note that my car temp is still running dead in the middle at 12 oclock.

If your ET was filled properly before the o-ring was replaced and if you only lost about a cup then you most likely will be fine.
When you say you lost about a cup of coolant, is this the amount you added back in to the ET, or an estimate of how much came out the connection on the lower hose?

You don't need to bleed the coolant system, unless you have lost a significant amount of coolant to the point of letting the ET become dry.

If your car isn't overheating, and the heater blows hot air, you're fine.

Originally Posted by TurnersInOz

If your ET was filled properly before the o-ring was replaced and if you only lost about a cup then you most likely will be fine.
When you say you lost about a cup of coolant, is this the amount you added back in to the ET, or an estimate of how much came out the connection on the lower hose?

Thanks for the response. It was an estimate of the amount of coolant that came out of the lower radiator hose when I pulled the coolant temp sensor out. The level in the ET was a bit low prior just do to the leaky sensor, but the low coolant light did not come on yet.

Originally Posted by mkodama

If your car isn't overheating, and the heater blows hot air, you're fine.

I'll check the heater.