coolant bleed questions
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 932
Likes: 0
From: Las Cruces New Mexico
coolant bleed questions
Maybe I am not asking the right question in the search engine so I am asking again.
1. How do you know you have air in the coolant system?
2. How do you actually bleed the system of all air?
3. How do you know you have all the air out?
Thank you for your responses.
1. How do you know you have air in the coolant system?
2. How do you actually bleed the system of all air?
3. How do you know you have all the air out?
Thank you for your responses.
Burning Brakes
Joined: Sep 2006
Posts: 936
Likes: 8
From: England United Kingdom
HI MATE
ALL I CAN TELL YOU IS WHAT IT SAYS IN THE MANUAL.TOP OFF THE COOLANT, CAP OFF,START CAR,WARM UP A LITTLE,THEN CYCLE THE MOTOR RPM`S FROM IDLE TO 3,000 REVS.LET IDLE THEN BACK UP TO
3K REPEAT FOR A COUPLE A MINS.SHUT OFF CHECK COOLANT LEVEL.
TOP UP IF REQ.I PUT THE CAP BACK ON AT THIS STAGE,BUT NOT SURE IF YOU SHOULD STILL LEAVE IT OFF.START CAR AGAIN AND CYCLE THE MOTOR AS ABOVE.AS FAR AS I KNOW WHAT THIS DOES IS GET THE WATER PUMP PRESSURE UP AND IT HELPS FLUSH ANY TRAPPED AIR OUT OF THE COOLANT PASSAGES IN THE MOTOR ETC.
DO THE CYCLE THING SAY 3 TO 4 TIMES, CHECK FLUID FOR THE NEXT WEEK.SHOULD BE GOOD TO GO.
ALL I GOT 
ALL I CAN TELL YOU IS WHAT IT SAYS IN THE MANUAL.TOP OFF THE COOLANT, CAP OFF,START CAR,WARM UP A LITTLE,THEN CYCLE THE MOTOR RPM`S FROM IDLE TO 3,000 REVS.LET IDLE THEN BACK UP TO
3K REPEAT FOR A COUPLE A MINS.SHUT OFF CHECK COOLANT LEVEL.
TOP UP IF REQ.I PUT THE CAP BACK ON AT THIS STAGE,BUT NOT SURE IF YOU SHOULD STILL LEAVE IT OFF.START CAR AGAIN AND CYCLE THE MOTOR AS ABOVE.AS FAR AS I KNOW WHAT THIS DOES IS GET THE WATER PUMP PRESSURE UP AND IT HELPS FLUSH ANY TRAPPED AIR OUT OF THE COOLANT PASSAGES IN THE MOTOR ETC.
DO THE CYCLE THING SAY 3 TO 4 TIMES, CHECK FLUID FOR THE NEXT WEEK.SHOULD BE GOOD TO GO.
ALL I GOT
Racer
Joined: Sep 2006
Posts: 389
Likes: 1
From: Roswell GA
To get it all out you have to run the engine with the cap off and watch for bubbles in the resovoir(This is how I have always done it on cars where the radiator cap is on the radiator, I assume it is the same for the resevoir). Once the bubbles stop coming up then you can close it off and you should be good. It can take 10-15 minutes sometimes to get it all out.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
HI MATE
ALL I CAN TELL YOU IS WHAT IT SAYS IN THE MANUAL.TOP OFF THE COOLANT, CAP OFF,START CAR,WARM UP A LITTLE,THEN CYCLE THE MOTOR RPM`S FROM IDLE TO 3,000 REVS.LET IDLE THEN BACK UP TO
3K REPEAT FOR A COUPLE A MINS.SHUT OFF CHECK COOLANT LEVEL.
TOP UP IF REQ.I PUT THE CAP BACK ON AT THIS STAGE,BUT NOT SURE IF YOU SHOULD STILL LEAVE IT OFF.START CAR AGAIN AND CYCLE THE MOTOR AS ABOVE.AS FAR AS I KNOW WHAT THIS DOES IS GET THE WATER PUMP PRESSURE UP AND IT HELPS FLUSH ANY TRAPPED AIR OUT OF THE COOLANT PASSAGES IN THE MOTOR ETC.
DO THE CYCLE THING SAY 3 TO 4 TIMES, CHECK FLUID FOR THE NEXT WEEK.SHOULD BE GOOD TO GO.
ALL I GOT
ALL I CAN TELL YOU IS WHAT IT SAYS IN THE MANUAL.TOP OFF THE COOLANT, CAP OFF,START CAR,WARM UP A LITTLE,THEN CYCLE THE MOTOR RPM`S FROM IDLE TO 3,000 REVS.LET IDLE THEN BACK UP TO
3K REPEAT FOR A COUPLE A MINS.SHUT OFF CHECK COOLANT LEVEL.
TOP UP IF REQ.I PUT THE CAP BACK ON AT THIS STAGE,BUT NOT SURE IF YOU SHOULD STILL LEAVE IT OFF.START CAR AGAIN AND CYCLE THE MOTOR AS ABOVE.AS FAR AS I KNOW WHAT THIS DOES IS GET THE WATER PUMP PRESSURE UP AND IT HELPS FLUSH ANY TRAPPED AIR OUT OF THE COOLANT PASSAGES IN THE MOTOR ETC.
DO THE CYCLE THING SAY 3 TO 4 TIMES, CHECK FLUID FOR THE NEXT WEEK.SHOULD BE GOOD TO GO.
ALL I GOT
WARNING ..... WATCH THE COOLANT TEMPERATURE IF YOU HAVE THE CAP OFF THE RESERVOIR
With the cap off, your coolant will start to boil at about 210 degrees, which the car will easily reach sitting still. With the cap on the coolant can reach about 265 before it boils.
Also, be careful removing the cap after the coolant is warmed up. The cap is pressurized, and removing it when the coolant is above about 210 will cause the coolant to SUDDENLY boil, often spraying boiling coolant out around the cap. You can get badly burned messing with a "hot" engine's cooling system. BE CAREFUL.
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 932
Likes: 0
From: Las Cruces New Mexico
Thank you all for the replies.
I just had the intake off to replace both knock sensors and obviously had to remove the hose from the radiator. I just wanted to make sure that I was not going to have high temp issues I have read others mention due to air in the system.
Have a great day.
I just had the intake off to replace both knock sensors and obviously had to remove the hose from the radiator. I just wanted to make sure that I was not going to have high temp issues I have read others mention due to air in the system.
Have a great day.
