how to drain coolant

by key dismukes in 912 / 914 Technical Questions 7 years ago

What is the best way to drain the coolant when the radiator is mounted below the engine? I understand to use the drain plug on the water pump, but as far as i can tell there is no drain plug on the radiator (???). It makes for a messy job to get the coolant out of the radiator.

Key

Re: how to drain coolant

by David HEAL » 7 years ago

David HEAL

23 194 444

Remove the lowest coolant hose serving the radiator. Open the top-most port on the system to break the vacuum.

Report
Re: how to drain coolant

by Roger Lee » 7 years ago

Roger Lee

131 5.38k 5.44k

You can use the bottom screw on the water pump, but in some aircraft it's too hard to get to and it doesn't get it all out.
Try this. I do this all the time. Pull the lower hose off the radiator and let it drain into your pan then remove the expansion tank cap and a lot more will come out. Now drape a rag over the hose end that you moved to the side and the radiator stub out. Then cup your hand around the expansion tank neck and blow down through it 4-5 times real hard. This will evacuate practically everything throughout the entire system. The rag keeps it from spraying all over. Works well and it's fast and easy.

p.s..
If your old like me after you blow 4-5 times real hard you made need to stop for some oxygen. LOL

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Report
Re: how to drain coolant

by key dismukes » 7 years ago

key dismukes

15 11 6

Thanks guys!

Key

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
Assistance to identify connector for coolant temperature sensor	915iS Technical Questions	7
Draining Fuel	912 / 914 Technical Questions	1
Follow up after coolant temperature exceeded	912iS Technical Questions	6
Vent hose for 912ULS coolant overflow bottle?	912 / 914 Technical Questions	7
Minor coolant leak on 912ULS	912 / 914 Technical Questions	8