Hey Scotty,
I have a 2003 Nissan Pathfinder 4wd automatic. I’m losing about a cup or two of coolant a day but after a quick glance I see no obvious signs of a leak, more like a seep. I’ve had a pulley whining for a couple months before I ever noticed the coolant loss. No leaks around the water pump. Could it be going bad and causing the coolant loss? Should I start with a coolant flush? Worried I may knock some corrosion loose and make the leak worse. Thanks, I’ve been watching your videos a couple years now, big fan.
I’m losing about a cup or two of coolant a day but after a quick glance I see no obvious signs of a leak
Sounds like a head gasket!
The coolant must be escaping somewhere, it might be through the head gasket being burned.
after a quick glance I see no obvious signs of a leak, more like a seep.
Are you seeing wetness somewhere? Your statement is a little confusing. They make leak dye for antifreeze. Throw some in your radiator and trace the cooling system with a UV light.
Also pressure test the cooling system. It should hold whatever PSI rating your system is for 15-20 minutes. If it doesn't, there's a leak you need to find.
With the dye, unless it's seeping through the head gasket and into the cylinders, you will see where it's leaking.
Should I start with a coolant flush?
No. A flush will not fix a leak, and it's pointless to put new coolant in a leaking system.
If you find no leaks, consider testing for a blown headgasket. Has there been puffy white smoke in the exhaust?
