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Old 05-27-2017, 02:54 PM   #1
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Coolant additive

I want to check my supplemental coolant additive in my 08 monaco diplomat 40skq. I have the test kit and it says not to take the sample from the radiator reservoir, well guess what, no radiator cap, petcock, drain cock, nothing that I can find to get a sample other than the reservoir So I took the sample from the reservoir and it tested good. Anyone know of a secret place to draw a sample other than the reservoir, and why not the reservoir.

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Old 05-27-2017, 02:59 PM   #2
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I think its that the fluid in the surge tank doesn't really 'circulate', it only goes in and out with the tide, so to speak, so fluid in the tank may not be representative of that circulating in the cooling system.

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Old 05-27-2017, 07:40 PM   #3
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Originally Posted by cruzbill View Post
I think its that the fluid in the surge tank doesn't really 'circulate', it only goes in and out with the tide, so to speak, so fluid in the tank may not be representative of that circulating in the cooling system.

Then how would you add coolant?
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Old 05-27-2017, 08:09 PM   #4
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What color is the fluid. And yes, that is the only place I can think of to get it on my 08 Endeavor 40SKQ. A clone to yours.

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Old 05-30-2017, 07:55 PM   #5
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The tank is an expansion tank and not an overflow tank on a passenger car. There is coolant flowing constantly through the tank, albeit at a slower rate than the rest of the system. It is part of the pressurized system.

There is a coolant pipe coming out of the head that Tee's, going to both turbo and tank, via 3/8" hose. There is a second 3/8" hose going to top of radiator at one end., if I remember correctly.

Fortunately, with a side radiator, I can see the hose routing to the expansion tank.

So, taking a sample at the expansion tank is a great place to get accurate reading of your coolant.

I hope this helps.

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Old 05-31-2017, 08:43 AM   #6
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They always sample my coolant from the tank. May not be the perfect location, but getting to the petcock is a pain in the rear. Also, check the expiration date on your test strips. They do go out of date.
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Old 05-31-2017, 08:02 PM   #7
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Just did my test today. I have a expansion coolant tank and that is where it said to get the sample. Ran engine for 30 minutes with heater on then let it cool down. Used a pair of needle nose pliers and dipped the strip into the tank. You have to follow the directions closely as there is 'seconds' time limit to get a accurate reading. Test turned out good !

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