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cooling system air bubbles
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When was the last time you changed that upper radiator hose? Sounds like you
need to replace the hose. If it's bulging out, it's a weak hose and the
cooling system is not able to maintain pressure. If there is no pressure in
the cooling system the system can overheat. I bet the hose goes back to its
normal size after you open the reservoir. Remove the hose and inspect it,
it's probably split or separated inside.
GL.
-Dick-
78 Scirocco
Original Owner
http://members.aol.com/sailingfc/
In a message dated 3/21/03 3:50:57 PM Pacific Standard Time,
treed2@u.washington.edu writes:
Okay, since we're on the topic of cooling systems I'll bring this up..
Basically, I'm suspect that I still have air in my cooling system. The car
runs at normal temp (a hair above the LED) until I get to a stop light.
After 45 seconds or so of sitting, the temp has risen to 3/4 on the gauge.
That never happened before, so I'm guessing there's still an air pocket.
I already burped several huge bubbles out including one that was over a
liter (it took that much water to fill the reservoir back up)
I haven't had a chance to idle the car and watch it warm up to see if/when
the fan is coming on (although it is on when I'm sitting at a stoplight
like that, since I had the blower on defrost and that spins up my rad fan)
because its so freaking rainy, but the radiator fan switch is only 2 years
old anyway and I don't think that's it.
When I have driven for a long time and park and pop the hood, the upper
radiator hose is all bloated like its full of air but if I open the
coolant reservoir partway its pressurized and just dumps coolant
everywhere.
Any foolproof methods you guys use to blow -all- the air out of the
cooling system?
I drilled a 3/32" hole in my thermostat in that part that looked like it
opened (the large disc shaped piece, not the spring-loaded small one at
the other end).. I revved the engine a bunch with the reservoir cap off, I
did a few heating/cooling cycles. I drove the car probably 60 miles
since I draining and filled the coolant.. What else is there?
I hate vw cooling systems..
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<HTML><FONT FACE=3Darial,helvetica><BODY BGCOLOR=3D"#ffffff"><FONT style=
=3D"BACKGROUND-COLOR: #ffffff" SIZE=3D2 FAMILY=3D"SANSSERIF" FACE=3D"Arial"=20=
LANG=3D"0">When was the last time you changed that upper radiator hose? =
; Sounds like you need to replace the hose. If it's bulging out, it's=20=
a weak hose and the cooling system is not able to maintain pressure. I=
f there is no pressure in the cooling system the system can overheat. =20=
I bet the hose goes back to its normal size after you open the reservoir.&nb=
sp; Remove the hose and inspect it, it's probably split or separated inside.=
<BR>
GL.<BR>
<BR>
-Dick-<BR>
78 Scirocco<BR>
Original Owner<BR>
http://members.aol.com/sailingfc/<BR>
<BR>
<BR>
In a message dated 3/21/03 3:50:57 PM Pacific Standard Time, treed2@u.washin=
gton.edu writes:<BR>
<BR>
Okay, since we're on the topic of cooling systems I'll bring this up..<BR>
<BR>
Basically, I'm suspect that I still have air in my cooling system. The car<B=
R>
runs at normal temp (a hair above the LED) until I get to a stop light.<BR>
After 45 seconds or so of sitting, the temp has risen to 3/4 on the gauge.<B=
R>
That never happened before, so I'm guessing there's still an air pocket.<BR>
<BR>
I already burped several huge bubbles out including one that was over a<BR>
liter (it took that much water to fill the reservoir back up)<BR>
<BR>
I haven't had a chance to idle the car and watch it warm up to see if/when<B=
R>
the fan is coming on (although it is on when I'm sitting at a stoplight<BR>
like that, since I had the blower on defrost and that spins up my rad fan)<B=
R>
because its so freaking rainy, but the radiator fan switch is only 2 years<B=
R>
old anyway and I don't think that's it.<BR>
<BR>
When I have driven for a long time and park and pop the hood, the upper<BR>
radiator hose is all bloated like its full of air but if I open the<BR>
coolant reservoir partway its pressurized and just dumps coolant<BR>
everywhere.<BR>
<BR>
Any foolproof methods you guys use to blow -all- the air out of the<BR>
cooling system?<BR>
<BR>
I drilled a 3/32" hole in my thermostat in that part that looked like it<BR>
opened (the large disc shaped piece, not the spring-loaded small one at<BR>
the other end).. I revved the engine a bunch with the reservoir cap off, I<B=
R>
did a few heating/cooling cycles. I drove the car probably 60 miles<BR>
since I draining and filled the coolant.. What else is there?<BR>
<BR>
I hate vw cooling systems..<BR>
</FONT></HTML>
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