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Old 06-18-2005, 06:42 PM   #1
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Workhorse Chassis Owner
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Location: San Jose, Califorinia
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I have had this rig now for almost a year. The coolant tank has run dry about every trip. I think coolant has been added about 5 times so far.
WHERE DOES IT GO?
The local workhorse warranty shop decided to try and find out. They took another Class A that was having this problem and put a second expansion tank on it so that the overflow from the first tank went into the second tank.
Yup that is where it went.
It seems that for some reason when at operating temp. it overflows into the expansion tank and out through the hose and is lost. When the engine is cooled down and sucks the coolant back into the radiator enough has been lost that the tank is empty. This is only two or three cupfuls to bring it up to the cold line but I wonder if this is accumlative. I just keep adding and adding. There is no coolant in the engine or trans oil.
What experience have the rest of you had regarding this problem?
what should be done about it. Is this why engines get fried?
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Old 06-18-2005, 06:42 PM   #2
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Workhorse Chassis Owner
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Location: San Jose, Califorinia
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I have had this rig now for almost a year. The coolant tank has run dry about every trip. I think coolant has been added about 5 times so far.
WHERE DOES IT GO?
The local workhorse warranty shop decided to try and find out. They took another Class A that was having this problem and put a second expansion tank on it so that the overflow from the first tank went into the second tank.
Yup that is where it went.
It seems that for some reason when at operating temp. it overflows into the expansion tank and out through the hose and is lost. When the engine is cooled down and sucks the coolant back into the radiator enough has been lost that the tank is empty. This is only two or three cupfuls to bring it up to the cold line but I wonder if this is accumlative. I just keep adding and adding. There is no coolant in the engine or trans oil.
What experience have the rest of you had regarding this problem?
what should be done about it. Is this why engines get fried?
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Bill, Jann
2004 Rexhall Rexair, W22, 3250BSL, Vortec 8.1, Allison 5 speed, 2 slides, Saturn SC2 and 2013 Chev Sonic toads.
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Old 06-18-2005, 07:51 PM   #3
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When you add coolent, do you add to the cold line? When i brought my W20 home I checked the coolent tank and it was about an inch below the cold line. I decided to leave it there and see what happened. 15k miles later it is still in the exact same spot. Might try leaving yours an inch or so low and see what happens
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Old 06-18-2005, 10:19 PM   #4
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Hi Bebop and Al,
That's pretty interesting. I just bought my W20 a few weeks back and my coolant tank was showing an inch or so below the cold line. I took a 1000 mile shakedown tour and I believe it still reads that way. I originally thought that the dealer overlooked this, but now? I'll have to check. That reminds me that I have to buy some coolant....or not.
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Old 06-19-2005, 07:27 AM   #5
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I was also loosing coolant. But mine was through the manafold bolt on the drivers side and on one of the engine block plugs. It was recommended by WH that I use the GM stop leak that wouldn't void my warranty. So I added the GM stop leak and haven't had any problems in the past 7,000 miles. Apparently when the line worker put the manafold bolts and plugs in the block they did not use compound on the bolt threads, Nice!
Good help and companies are hard to find!
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Old 06-19-2005, 07:50 AM   #6
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Thanks for your reply.
The problem with your reply is that the cold coolant level is only an inch above the bottom of the overflow tank.
Bebop
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Old 06-19-2005, 09:40 AM   #7
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Sounds like you might have an exhaust leak. There is a simple test for that and any shop can do.
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Old 06-21-2005, 02:36 PM   #8
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FWIW... My 2004 W22 has 9k on it and the coolant level in the tank is just slightly below the "Cold Line" when cold. When it was new I could smell a coolant smell while driving under certain circumstances.

At 2k the WH service center I went to claimed the rad. cap was defective and replaced it under warranty. Not sure if they topped up the coolant but I haven't touched it myself and 7k later the coolant is right where it should be when cold.
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