Must have tool for any build

[Fuel an]

I have been go carting for the last 6 weeks, but having cooling issues, in the end it was air in the could the coolant system. I changed thermostats three times, added a a larger expansion tank, tried the techniques listed by other forum members no luck. The bottom hose was always cool and temps would get up to 219-224 F , based on my scanner plugged into the computer. At a race last week, a buddy told me to try the Maddox kit from Harbor Freight. I drained the system, put the tool on the coolant inlet per the instructions, attached the air hose and created 25-26 inches of vacuum, it held, so the system was sealed, put a few gallons of coolant in a 5 gallon bucket and opened the line, coolant started to flow into the radiator and the block, once the gauge read 0, closed the valve, put the radiator cap back on and took it for a 5 mile drive. No smell of boiling coolant, car ran great and stayed around 180-190F, a bit cool today in Florida (55F.). Got back to my garage and let the car idle, bottom hose was hot, fan would come on at 195F and cool the car down to 187F. I finally beat those air pocket gremlins. I’m going to use this on all my cars when changing thermostats and coolant. I recommend if you are having any issues with flow or over heating to give this tool a try.

[Nigel Allen]

Great result. Couple of questions:

- Do you have the Coyote degassing circuit plumbed in?

- Do you have flow between the heater outlet and return connections on the engine?

Both are important for correct cooling of the engine. I have seen the left-hand bank cooked as a result of capping these spigots.

There is a Ford pdf online showing cooling system layout. I played it safe and went with it. No cooling or air issues as it self bleeds.

Cheers,

Nigel

[Fuel an]

Hi Nigel,

I am not running a heater, so I put the bypass hose connecting the heater out and return together. If the degassing pipe is the pipe sticking up from the left front side of the intake, then I have that capped. I checked both heads, front and back, with my heat gun and they are reading within a few degrees of each other, approx 140F. As well, I check front, back and sides of the block and temps are consistent.

I had a helluva an air bubble though, maybe the degassing pipe would have helped, I opened it many times and could not get consistent flow. Regardless, very happy with this tool, I am sure it is going to help with my Viper also, which are notorious for burping issues.

When the World gets back to normal, I have to make it over to Australia, it’s been on my list for a long time.

[richtersand]

Thanks for sharing!