I have a srt6 with 85000 miles. When it got warm out my coolant low level light came on. I topped off the rez with distilled water. About 50 miles later it was low again. I have filled the rez 2 more times since than and drove about 75 miles. I did have a coolant hose break in the winter and I thought I filled it up right. I checked under the oil cap a saw a little white but it was after a short trip. I drove the car at a good pace and recheck and had no white. I use mobile 1 and do oil changes at about 3-5k. I have a slight oil leak on the upper valve covers it looks like.

Test 1 was to check the intercooler for leaks. I put 5/8 hoses with plugs and isolated the intercooler lines. I brought the psi on the intercooler to 15 psi. It did seems to drop 1 psi and use bubbles on all my fitting. It held that 14 psi for over a hour.

Test 2 was to do a compression test on the cylinders. I did one cylinder at a time. I had a reading of 115 - 120 psi on every cylinder when I cracked over the engine.

Now I'm at loss for what to do next. Is there another test I can do? Can a bad valve cover let moister into the engine?

 

Do a cooling system pressure check.

 

Check these off the list.

Radiator fan
Fan Control Module
Water Pump

 

Thanks for your help. The fan has come on. The coolant temp stays in the center of the gauge. The car has not overheated. Im going to inspect the water pump closer for a leak. I dont see anything leaking under the car.

 

In post #2 I said the car needs a coolant system pressure check, I do not see what a compression check would do as it is only for a brief amount of time, so even if a cylinder was cracked it would hardly register on the pressure.
The check is the same as you did to the IC except it does the whole system unless the IC circuit is separated. Small leaks in the radiators may hidden and dried before any hits the ground.