Question about 1999 Oldsmobile Alero

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1999 Olds Alero Coolant leakage

My 1999 leaks water (looks like Coolant) out of the evaporator housing drain tube. It does not do it all of the time, but when it does, it come out pretty good. What could be my problem?

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  • Chipper6 Jun 02, 2008

    Could the condensation be green colored like anti-freeze?

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  • Oldsmobile Master
  • 1,224 Answers

Sounds like you need to tighten connections on the housing drain tube with replacement of houses on vehicle replace drain tube
but also it could just be condesation from a/c this is normal

Posted on May 31, 2008

  • Christophe Thompson
    Christophe Thompson Jun 02, 2008

    i know on some a/c units they add a die for coloration in the a/c unit to help find leaks and this could be what your seeing



    also you want to take into accord that your heater core is right behind a/c condensor on the passenger side front this looks like a little radiator if this had sprung a leak or faulted your passenger floor will be soaked

    this heater core could have a tiny leak into spraying back on the condensor given you the leak

    the 2 main hoses that are going from the firewall to radiator and therm houseing about 3/4 thick hoses look at these to make sure there not leaking doing a spray

    keep eye on water level and the heat of vehicle



    also when condensation happens it could mix with oil particuls on engine given you the greenish color

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1 Answer

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The vents are clogged.
you will need to check both drain tubes to make sure they are clear.the Evaporator drain tubes the condenser does not have drain tubes. They exit the vehicle underneath the vehicle along side the transmission. They are a black rubber tube, you will need to get under the vehicle to access them.If you have no water coming out of those drains that is your problem.On top of the transmission tunnel inside the vehicle. If you look along the transmission tunnel inside the vehicle you will see the carpeted section that can be removed which is held in place by a screw. Remove this carpet on both side and you should be able to see the evaporator drains.Because the tubes are not draining the water the housing will fill up with water until it finds a point were it can leak out from.Underneath you will not see the clogging you do not need to replace them for clogging. The best way is to check the drain tubes were they connect to the housing. Yes it can be a common problem if your cabin filter has not been changed at the times that are required or if you live in an area were there are a lot of trees.

There is dealer service bulletin on such problem:
If this leakage happens when it is not raining ... and ... it does not smell like engine coolant (a sweet maple-like smell) ... AND .... you are running the air conditioning, this may be condensation drain-off from the A/C evaporator. This condensation is supposed to drain through the bottom of the heater/AC box and then through the floor (at the top of the transmission tunnel hump), to the ground. This is the puddle of water that you see under a car when the air conditioning is running.
If the drains in your heater/AC box are clogged (or the tubes connecting the drains to the chassis floor), the condensation will gather and then leak out onto the floor. The cure is to clear the drain tubes. If all of the above points fit your scenario, of course, this is under warranty. I would suggest that you ask what the dealer has already done (in detail) and note that you still have the leakage and the the drains are likely still clogged (again, if the above parameters fit your case).


Also click the link below for more help:
http://carrepairworld.blogspot.com/2016/06/bmw-x5-central-vent-block.html
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This will help.
Thanks.

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