purge cooling system

[nater200]

how do i purge the cooling system of air bubbles without drilling a hole in my thermastat. any advice would be appreciated.

nater

 

[addo]

You could try parking the car facing uphill and taking off the radiator cap. Then bounce the car well at the front. Make sure the radiator is filled to 1" below the lip of the cap if it doesn't have an overflow bottle. Put the radiator cap back on, and squeeze the upper hose a few times. Sometimes you'll hear a little air getting through.

Also when the motor's hot from running, you can park it facing uphill.

Cheers, Adam.

 

[pedal2themetal45]

Or you could just fill it, run it untill it get hot (not over heated just hot). shut it off let it cool the fill it again run it driver it or what ever then be sure to check it again after its cooled down and refill if needed to about 1" below the lip if its totaly cold..
tim

 

[XFlow_Fairlane]

I just fill it and let it run until warmed up. with a jug of water on hand I will work the throttle and burp the air out that way and just keep it topped off while I do this.

 

[CobraSix]

Or you could just fill it, run it untill it get hot (not over heated just hot). shut it off let it cool the fill it again run it driver it or what ever then be sure to check it again after its cooled down and refill if needed to about 1" below the lip if its totaly cold..
tim

This is similar to what I did. I'd actually run the car in the driveway without the cap on. At first, it will suck the water out of the radiator so I'd keep filling it slowly. As soon as the level started to rise due to the heat expansion, I'd put the cap on and drive it around for 10-15 minutes. Then I'd let it cool down. Usually I never had to fill it again, but I would top it off if it did.

Slade

 

[XFlow_Fairlane]

don't forget that most early cars have no overflow. the tank on the radaitor was for expansion. it should have a low level normaly. by filling it to the top it will purge someout but that is normal.

 

[CoupeBoy]

I bought a special funnel. It has 2 main parts. A peice that screws onto the radiator like the normal cap, and then a funnel with stopper that sits on top of that. Easy to use, put on the cap, put on the funnel, fill'er up until the funnell is about 1/2full and start the car. As it runs and bubbles work their way out you can watch them in the funnel. When you are done you have 2 options.

option 1. wait until the motor is cooled, shove the stopper in the funnel, then pull the funnel off, unscrew the rad adapter, put the real one back on and yer done.

option 2. rev the motor a little when you think it is done, usually this pulls in a little fluid, get a friend to take the funnel of hot fluid away ASAP AND unscrew the adapter and shove your real cap on. (not recommended)

the whole funnel setup cost me 20$ (I think) from Carquest a couple years ago. I learned to love them after working in an shop for a few years.

-ron