Question about 1999 Porsche Boxster

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After I drive my 1999 boxter the pasenger side exterior vent smells like a radiator and vapor comes out.

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This is most likely leaking anti-freeze from the heater coil. Radiator Stop-Leak may help but replacement will likely be expensive. When replacing the heater coil, don't fail to rinse the plenum thoroughly. If you don't do this you will forever smell the anti-freeze....It does not evaporate ! That's why it is used. In the thirties and forties, alcohol was the anti-freeze of the day and it boiled off rapidly....results sere seized engine blocks or frozen systems. Thanks to DuPont for Prestone. Take care, Paul

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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Water evaporation always refilling radiator also when air condition off a vapor comes through the vents


The coolant is not evaporating ,it is leaking from the heater core. The vapor out of your vents is coolant. You probley also have a residue on the inside of your windshield

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You trucks heater core is leaking inside the dash heating vents, the air blower motor blows through the heater core and then you smell the leaking coolant in the form of a sickly sweet vapor. You will need to replace the header core, this is a fairly big job and in most cases best left to a professional.

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On a very humid day fog can be seen coming out of vents when using the AC. This would be a normal condition.

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With the vapor coming out I would say you have a hole in one of the heater hoses which go into the firewall in the area you describe. Inspect the hoses looking for the vapor with the engine still hot.

It could also be a leak in the heater core. The vent the vapor came out of is the source for fresh air for the heater and a/c. You should be able to smell antifreeze with the heater on inside the car if the leak is there. Water may also drip on the passenger side floor from the heater core.

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