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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3304
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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I am losing coolant but i cannot see a leak. Sometimes I can

Customer Question

I am losing coolant but i cannot see a leak. Sometimes I can smell in coming onto my cab.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

You took care of the first thing I was going to mention to check.

Do you have a radiator pressure tester by chance? If not, see if you can loan one from a Autozone under their tool loan program or from another parts repair.

Put the pressure pump onto the reservoir and pump it up to about 18 or 20 psi. Then check all the hoses for the leak. You should see it spraying out wherever it is leaking at this pressure. It won;t harm anything, other than show you the leak. This is the best and fastest method to finding a leak.

Reason I mention this tool is because some leaks can be hidden until the coolant is hot and then they show from the expansion of metal and hoses. Trust me, it will save a lot of time and aggravation. Check the coolant hoses going to the heater core and the floor board of the truck to rule that out. It tends to leak the most with coolant hose on the turbo second, and radiator third.

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