I have a 1986 isuzu pup 2wd with the 2.3 4cyl truck runs amazing but I am loosing coolant Was thinking head cracked or blown head gasket but the Oil is clean not Milky Haven’t noticed any smoking from exhaust no leaks from radiator or anywhere else I replaced the radiator cap due to the old one seal was gone I’m stumped any idea what it could be?
It's either burning coolant or leaking it. No other possibilities exist.
Pressure test the cooling system and/or use UV dye to check for leaks. Test for possible head gasket failure.
https://www.youtube.com/watch?v=rDuGeQnMOzk
https://www.youtube.com/watch?v=v0U8Iyf0kk4
Beat ya by one minute @chucktobias!
You can confirm any leaks with a leak dye kit. If it's not leaking coolant, it is burning it. Check that with another test kit, both available at any auto parts store.
https://www.harborfreight.com/combustion-leak-detector-64814.html
