Coolant system question?

MK3er

New Member
Jan 1, 2010
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Ohio
Did you burp the system after replacing said parts and what brought you to the conclusion your low on coolent?
 

SupraRon

Supramania Contributor
Jan 2, 2008
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Canada
Did you burp the system after replacing said parts and what brought you to the conclusion your low on coolent?
+1. Jack the front of the car up so that all the air flows to the highest point in the system. Open the cap and watch for bubbles. Keep adding coolant as the level lowers and until it stabilizes and there are no bubbles. This is all while the car is running. I just had to go through this process.
 

modmonster2008

mod crazy yo!
Sep 9, 2008
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i burped the cooling system based on how the forum told me to, then afted about 2 days after burping i kept topping the fluid off, and after i still keep adding fluid and the bubbling comes back so thats why i know it keeps losing coolant
 

modmonster2008

mod crazy yo!
Sep 9, 2008
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by not in my favor does it mean it could be the cause or no? i havent checked the plugs but last time i checked (1k miles ago) they were about all the same color, no antifreeze tint or any plugs cleaner than the rest
 

modmonster2008

mod crazy yo!
Sep 9, 2008
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that i have no idea why at 11, but what i noticed was that it was slowly losing pressure maybe about 1 psi per 45-60 minutes? so i knew there was a leak somewhere as if it was completely sealed then the pressure would maintain till i reset the gauge
 

modmonster2008

mod crazy yo!
Sep 9, 2008
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okay this is weird, i notice on some days the radiator reservoir would be near empty the next morning after a long trip, then today after a long drive, let it cool down for about 8 hours and checked just now the upper radiator hose feels completely soft like theres no water in it but the overflow bottle is still at full, and when i opened the radiator cap the fluid is sitting lower than it does, its driving me crazyy
 

MK3er

New Member
Jan 1, 2010
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Ohio
If you have your own pressure tester or can borrow your friends and get some uv die. Take the engine under cover off and pressure up the system till about 13-15psi and walk away for about an hour come back and look for any fluid on the ground then trace it up. If nothing is on the ground use a black light to look for any fluid on the engine/radiator.
 

CyFi6

Aliens.
Oct 11, 2007
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Do a cylinder leakdown test with the radiator cap off and when you do each cylinder pay attention to the water level, if it starts to rise or bubble you know you have issues. When my NA had a very slight BHG i got no readings from the block test, but everytime i would drive coolant would rise pretty much like normal in the tank, but when it cooled off it stayed in the tank and the upper hose was full of air(combustion gasses).