How dealer does an air-bound coolant flush?
12-11-2003, 10:18 AM
#1
How dealer does an air-bound coolant flush?
I heard there is a TSB out for our heater cores getting air trapped in there and the dealer is supposed to do an air bound flush on the coolant system to get the air out.
Does anybody know how they do it? is there a machine for it or they just raise the front end of the car and try to bleed it out.
Does anybody know how they do it? is there a machine for it or they just raise the front end of the car and try to bleed it out.
12-12-2003, 11:33 AM
#2
Senior Member
Join Date: Sep 2003
Posts: 477
I think I read that there is a procedure where you jack up the front end, maybe that was in the archives here somewhere. Otherwise I heard that there is a new coolant exchange device lots of shops are using. You take off the radiator cap and screw in a cap with a hose. Maybe another hose goes somewhere else? Then they pump out the old, put in new, and also bleed out air at the same time.
12-12-2003, 02:32 PM
#4
Junior Member
Join Date: Mar 2001
Posts: 21
I thought all modern engines kind of "bled" the air out themselves ... as long as the top of the radiator was below the highest point of coolant flow of the motor. I know there's an air bleeder bolt on the top of the VG's that you can open up to fully bleed the system ... I don't know what this would have to do with the heater core though.
I think the thing where they hook a hose up to the radiator cap is just to do a power-flush and clean out the radiator... I don't think it affects other components (water pump, heater core, etc.)
I think the thing where they hook a hose up to the radiator cap is just to do a power-flush and clean out the radiator... I don't think it affects other components (water pump, heater core, etc.)
12-12-2003, 02:51 PM
#5
Originally Posted by HoleyMax
I thought all modern engines kind of "bled" the air out themselves ... as long as the top of the radiator was below the highest point of coolant flow of the motor. I know there's an air bleeder bolt on the top of the VG's that you can open up to fully bleed the system ... I don't know what this would have to do with the heater core though.
I think the thing where they hook a hose up to the radiator cap is just to do a power-flush and clean out the radiator... I don't think it affects other components (water pump, heater core, etc.)
I think the thing where they hook a hose up to the radiator cap is just to do a power-flush and clean out the radiator... I don't think it affects other components (water pump, heater core, etc.)
"I thought all modern engines kind of "bled" the air out themselves ... as long as the top of the radiator was "ABOVE" the highest point of coolant flow of the motor"
12-12-2003, 04:07 PM
#6
Junior Member
Join Date: Mar 2001
Posts: 21
Originally Posted by drstillpatient
"I thought all modern engines kind of "bled" the air out themselves ... as long as the top of the radiator was "ABOVE" the highest point of coolant flow of the motor"
12-12-2003, 10:22 PM
#7
Originally Posted by HoleyMax
Naw, I really did mean to say that the top of thte radiator had to be lower... there are no bleed points on the radiator itself... so air could get trapped in if it were mounted too high. Unless of course, that there is a bleed screw in the radiator.
In theory yeah that works cuz the bleeder screw is on the rear of the intake manifold...but from the Nissan TSB, it says the front end should be higher than the rear...to use the radiator filler neck as a bleeder hole.
12-13-2003, 07:18 AM
#8
Originally Posted by HoleyMax
Naw, I really did mean to say that the top of thte radiator had to be lower... there are no bleed points on the radiator itself... so air could get trapped in if it were mounted too high. Unless of course, that there is a bleed screw in the radiator.
there is... it looks like this:
12-14-2003, 12:18 AM
#10
Senior Member
Join Date: Oct 2002
Posts: 162
azmalu
im needing to simple flush this weekend and ive done it before. i only own the manual for 85-92 and it mentions that on vg there is 2 drain plugs for coolant....is that true because that might be why i am having to do this again after only 3 months?
12-14-2003, 09:57 AM
#11
Originally Posted by azmalu
im needing to simple flush this weekend and ive done it before. i only own the manual for 85-92 and it mentions that on vg there is 2 drain plugs for coolant....is that true because that might be why i am having to do this again after only 3 months?
There are 2 drain plugs for coolant on the engine block and one plug at the bottom of the radiator.
What exactly happened to your coolant?
12-14-2003, 12:32 PM
#12
Senior Member
Join Date: Oct 2002
Posts: 162
Originally Posted by drstillpatient
There are 2 drain plugs for coolant on the engine block and one plug at the bottom of the radiator.
What exactly happened to your coolant?
What exactly happened to your coolant?
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