How do I fix my coolant leak?

1999 SAAB 9-5
159 MILES
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I have had this car since the end of July 2011. I didn't have any problems with the car until I drove it for the longest distance (about a 40 min. drive) in the rain. During this drive, the top hose for the coolant literally exploded. I fixed that and still had a coolant problem, so I had it checked out. It turned out that my radiator had cracked. I bought a new radiator and had it installed. A few days later, I noticed I still had a coolant problem. This time, it took longer to figure out, but we figured out that my Heater core valve was leaking. I got a new heater core valve and had it put in. The car was fine for about 5 days, then started to smoke from a 20 min. drive and all of my coolant fell out of my car. I am not sure what else I could fix on the car to fix the coolant problem. Do you have any suggestions?
Nov 3, 2011 at 7:30 PM
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DOCFIXIT
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Suspect head gasket failure is there white smoke from exhaust?
Nov 3, 2011 at 7:37 PM
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There is only white smoke every once in a while, it doesn't happen every time I start the car
Nov 3, 2011 at 7:40 PM
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DOCFIXIT
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Check oil is it strange milk chocolate? have leak down test on cooling system to verefiy head gasket
Nov 3, 2011 at 7:49 PM
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The oil is clear, no problems with that. I checked that before I changed the heater core valve. How do I do a leak down test on the cooling system?
Nov 3, 2011 at 8:05 PM
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DOCFIXIT
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Pressurize coolant system let set several hours ,pull plugs crank lok for coolant coming from plug holes
Nov 8, 2011 at 7:06 PM