Heater core tester
Thread Starter
Le Mans Master
Joined: Jun 2019
Posts: 5,361
Likes: 2,108
From: Loveland
Yes,,,, I got the soap water out and tested the best that I could. It was hard to see the connection at the heater pipes. I did about 8 PSI and it blead off is seconds. You also need to be very careful not to explode your core. I used a bike hand pump. If you use an air compressor it's very easy to get to much pressure.
Melting Slicks
Joined: Feb 2017
Posts: 3,232
Likes: 1,232
From: PHX AZ
Absolutely don't overpressure! The Radiator cap and therefore the system is rated to 15psi...so just short of that will give the best results....I figure should hold pressure for 24 hours.
Probably blown.
cheers Unkahal
Probably blown.
cheers Unkahal
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Make sure you leak test your leak tester. Maybe put both ends on to a piece of copper tubing and blow it up and see if it holds. Is the heater core still in the car? If not get something like in oil drain pan or something else big enough fill it with water and plunk it in there.
