"oily_boot2" wrote: 97 Ranger 5-speed 90k miles
Since I bought the truck, it has often had a "fish oil" odor in
the cab after driving at least 5 minutes. I'm 95% sure it is
an ATF smell. Any suggestions?
ATF: Smell dipstick on PS reservoir for comparison.
Look for ATF dripping from PS pump or hoses.
COOLANT: Smell radiator coolant for comparison.
Look for reservoir overflow, radiator leaks, or
heater core leak.
OIL: Look for oil drip from valve cover on to exhaust system.
AC: Open evap drain port. Flush out box with vinegar
or mild bleach water if it has mold inside. Blow out
lint and dust from heater core.
FOOD: Shampoo carpeting/upholstery, clean out defroster vent.
BRAKE FLUID: Smell reservoir for comparison. Look for
fluid dripping from master cyl, brake lines, hoses,
and vacuum booster.
CLOTHING: The rubber/plastic in some tennis shoes made in
Asia has a definite fish oil smell. It fades with time.
Some of this material is in auto floor mats too.
GASOLINE: Probably not - smell is distinctive.
Some gasolines will put out an exhaust smell like epoxy resin
when the engine is running. Sometimes a cat converter puts
out a smell, but usually like rotten eggs, not fish.