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Engine smoke coming out of aircon vents

Hi,

I just got my new baby. The engine has not been running for a while. Now engine smoke is coming out of the air conditioning fans.

Any ideas where it could get into the system?

Thanks,

Boris
Old 10-30-2009, 08:27 AM
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You might have oil dripping onto the heat exchangers around the exhaust system. If the heat exchangers nedd replacement it can be quite expensive. Get it up on a ramp and have a look
Old 10-30-2009, 08:48 AM
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If the heat exchangers are undamaged, the next likely source is something leaking oil over the cylinders and heads under the fan shroud. When the breather cover, thermostat, or oil pressure sender leak, the oil will puddle and eventually migrate under the shroud and over the cylinders. On MFI cars, the bottom plate on the pump leaks and dumps oil over the left cylinder bank. The air under the fan shroud finds its way into the heat exchangers through the heater hoses next to the fan. Any leak under that shroud, or that migrates under it, will blow smoke into the heating system.
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Old 10-30-2009, 10:20 AM
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Here a pic of the heat exchangers
Old 10-30-2009, 10:34 AM
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I now noticed that the big black hose on the left has big holes. Can the smoke come in through there?

Thanks!
Old 10-30-2009, 10:35 AM
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If you have smoke with the AC on it is most likely the AC blower motor.
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Old 10-30-2009, 10:57 AM
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Quote:
Originally Posted by ShakinJoe View Post
If you have smoke with the AC on it is most likely the AC blower motor.
Actually it comes out without any blower on...
Old 10-30-2009, 11:31 AM
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That makes a big difference. Way under your car are air box valves with wires that open and close the air from the engine heat. It is the Heat Exchanger Duct and Valve in this picture. I would check to make sure your hose are connected and in good condition.

If you are new to the P Car world, take it to a reputable mechanic and have him look at it and ask if you can look under car when it is on the lift. You will learn a lot. Be careful with the carbon monoxide during this time of year and as important a fire!





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Old 10-30-2009, 12:06 PM
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Quote:
Originally Posted by borisschaefer View Post
Hi,

I just got my new baby. The engine has not been running for a while. Now engine smoke is coming out of the air conditioning fans.

Any ideas where it could get into the system?

Thanks,

Boris
'Engine' smoke can't come out of the AC vents, really.

Or do you mean the HEATER Vents?

What year is your car?

Describe which vents exactly the smoke is coming from. Center dash, below dash, under windshield?
Old 10-31-2009, 06:38 PM
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You are right!

It is coming out of the center dash and the under windshield vent.

Thanks!

Quote:
Originally Posted by tcar View Post
'Engine' smoke can't come out of the AC vents, really.

Or do you mean the HEATER Vents?

What year is your car?

Describe which vents exactly the smoke is coming from. Center dash, below dash, under windshield?
Old 10-31-2009, 11:28 PM
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And it is a 1977 911s.
Old 10-31-2009, 11:29 PM
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Does the car have Air conditioning? Does it have a compressor, etc.?

The center dash vent is for A/C if the car has A/C; if it doesn't, it's part of the ventilation system.

The vents under the windshield are part of the ventilation/heater system (defrost) and could have smoke from the engine coming out of them. Does the smoke smell like oil?
Old 11-01-2009, 07:53 AM
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It is fixed. It was oil dripping into the heat exchanger...

Thanks everybody for replying!
Old 11-14-2009, 01:21 PM
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Those heat exchangers look brand new. Engine looks very clean too..
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Old 06-26-2011, 12:36 AM
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Old 06-26-2011, 12:36 AM
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