Originally Posted by stewy
i used the drain valve at the bottom of the rad, real simple, i removed about a cup took it in the house did the test when anti-freeze was at room temperature. returned anti-freeze to rad and put in addative if required. retest later.
I just read this in an online tutorial at:
Dodge Cummins and Ford Power Stroke Diesel Truck Accessories - Geno's Garage
Collect a coolant sample from the radiator or pet****. Do not collect the sample from the coolant recovery-bottle.
(It should be noted that later Power Strokes do not have a radiator cap on the radiator. The pressure cap is on the coolant reservoir, which is in the ‘loop’ of circulated coolant.
Collecting coolant samples from these recovery bottles is acceptable.)
Before testing, the coolant must be between 50-130 degrees Fahrenheit. Room temperature is preferred.