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Bad Smell only when window is down...Smells like propane

I had full service done, Radiator,brake,engine,transmission and rear axle gear box oils replaced. 54,000 miles Was told everything looked good. Days later I was on the road for 2 hrs with ac running pulling boat and was about to clime hill so we turned off ac and rolled front windows down. A propane type smell hit us. Could not figure out smell and it would not go away. Only smell it when we are moving. Only smell it when window is down and we are moving. I brought it back to Chevy dealer and they said they think the rear axle gear box got very hot and created the smell and was released through the breathing tube. They think the gear box is going out.They replaced oil again. Was told once more the oil had no metal shaving and it looked good. My question; How hot can oil get before it starts to smell. Is it possible the gear box is going out...Or Help

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  • Barefooth2o Aug 17, 2008

    The rear differential is the gear box I am talking about. They said they did a test on the cat. and exhaust system and it checked out OK!

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No the ring and pinion seems ok from what you are saying...you wouldn't smell it up front while moving do to wind and what not,
oil can smell at low temps.
you may have an exhaust leak at an O2 sensor seal. or something relative to that.

Posted on Aug 17, 2008

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I just bought a 2005 Jeep Liberty and there is a leak under the front end after sitting for a few hours. It's clear and blace in a few spots. They have checked it and all fluid levels are full and can


blace?
is car 4WD?
ok, is this your first car?
is this your first car with A/C? for first time ever using and A/C?
(btw front defrost mode uses A/C functions)

if pure water, its just A/C condesate, 100% normal all cars.
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in the olden days we had tan, and green'
now its many.
toxic AF (antifreeze) green, pin, yellow, red, orange , etc. now.
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pull dip stick gander at the tip (THAT is your color today)
now the transmission, A./T automatic, it usually is pink, but can be
read or dark red. (if your year has a dip stick on A/t pull it and bingo your color is there)
then there is the leaking, (rare) window washers. (can be any color)
but is soaping to the touch.
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1 Answer

Theres a smell of gear oil in the cab when driving.What could it be?


(1) motor oil only smells when its being burned.
(2) the output of the air ducts is in front of the gear shift area.
So, I'm thinking that you have an oil leak in the engine compartment (which may be dripping onto the exhaust system), and the oil has found a hot part of the engine/exhaust, and the smell of heated oil is wafting through the cabin air filter into the passenger compartment through the air ducts in the middle of the dash to just above the gear shift area.
If my theory is correct, you should be able to re-route the burned oil odor by changing the setting of your air ducts by changing the setting from its current setting to a "defrost-type" setting, wherein air entering the passenger compartment comes from the ducts below the windshield, rather then entering through the openings at the center of the console.
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Here's your list of possible culprits for the 1997 Nissan Pathfinder

Priority Action Part Type Cause
1 Inspect - Valve Cover Gasket -- Valve Cover Gasket Leaking Oil.
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3 Inspect - PCV Valve -- Plugged or Damaged PCV Valve.
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TRANSMISSON PROBLEMS


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