Question about GMC Sierra 1500

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1999 GMC half ton mirrors leaking in water - Sierra 1500 GMC Cars & Trucks

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  • iwannamowgra Sep 27, 2009

    1999 GMC mirrors leaking, I have tried to take the mirrors off and silicone behind them and it did not fix it please help Thanks Robert

  • iwannamowgra Sep 27, 2009

    The Foam one in between the mirror and the door

  • iwannamowgra Sep 27, 2009

    Thank you for the info because it looked ok to me thanks again

  • iwannamowgra Sep 30, 2009

    its not the water pump it has nothing to do with heater core its a truck so it would not have a trunk

  • iwannamowgra Sep 30, 2009

    I have a 1999 GMC SLE 1500 The mirrors are leaking into the door panel of the truck and filling up the floor board and i have already took them off and put silicone around everything then put them back on and put a bead of silicone around the outside of the mirrors and still leaking anyone Really Know how to fix this

  • iwannamowgra Oct 01, 2009

    i have already tried silicone dont work

  • iwannamowgra Oct 02, 2009

    Is there a common Problem with 1999 GMC trucks leaking rain in the floor board with no visual area of it coming in if any one knows please reply

  • iwannamowgra Oct 02, 2009

    No Tried everything that would sound or look logical

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7 Answers

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Seems like you sealed up the mirror very well so that is probably not the entry point for the water. Verify that the drain holes on the bottom of the door are not plugged and that the weatherstrip is installed correctly and is sealing along the body properly..

I have fixed several of these where it seems like water is coming from the door but it ends up being from the cowl area. The best way to diagnose this would be to have someone run a garden hose over any suspected leak entry points while you lay on the floor with a good light and look under the dash and around the door seals.

If you look carefully you will find the leak. Once you find the leak, it should be easy to repair.

Posted on Oct 02, 2009

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Hi,

If you want to relate that with your problem, then it would be the same solution :-

Look under the hood at the rear of the engine compartment on the lower firewall on the passenger side,you should see the evaporator drain tube coming out of the firewall. I think water is going into the fresh air vent in the wiper area when it rains, but your evaporator drain is clogged so the heater/ a/c box fills up with rain water until it comes out in the floor.

The above one is the solution to all the problems relating to GMC floor leaking problems.As i have never seen mirrors leaking like this,so you would be the best one to link the solution i gave and the problem you are facing.

Let me know if need further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Do accept the solution, if 100% satisfied from my service!!

Posted on Oct 02, 2009

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  • 333 Answers

THere is a seal that is probably rotten. You can use a little silicone around the top of the mirror, that should stop the leaks.

Posted on Oct 01, 2009

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I don't think it leaking in from the mirror its self, it probably leaking from the body of the mirror. You can try this, use a clear silicone to seal it by removing the whole body mirror off the door and clear silicone it around the lips of the body or where ever you think is leaking in from. Being 99' sometime rubber then to weakened and compress from the heat. If that dont work; dont want to fiddle with it, ebay selling them for 20-40 bucks cheap some new and some used.

Posted on Sep 30, 2009

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First check out the water pump.most probably its having the hole in it that is causing the leak.but it can also be the hole in the roof side this may also make a leak.so first check out exactly where the leak is coming.is it from front or back.on which exact side./ also when your heater core is shot it will leak on the passenger side of vehicle and your windshield will fog up most of the time . also if diver side door seal or the trunk seal gets worn the water can leak. ------------ this will help check out.thanks.please do rate the solution.thank you for using fixya.keep updated.

Posted on Sep 30, 2009

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This is a common problem, you need to replace your weatherstripping/seal where it meets the door. You can buy the weatherstripping/seal kit from the GMC dealer 60 bucks and they are easy to install ask for the instructions when you get the kit.

Best of luck

Posted on Sep 27, 2009

  • Roger Campbell
    Roger Campbell Sep 27, 2009

    Yep thats the one... thats all there is to it. I see you already have it apart. Just change that and youll be fine.

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Usually if the leaks comes from the sides that mean that you have placed the mirrors for sometimes now and it started a gap between the body and the mirror, you need to take out the mirror and look for a silicon sealer ($2) from any auto part store) and buy a sheet of gasket (they use this to make customs cut gaskets) it cost about $3-$5 and cut to size around the mirrors as you are going to build a casket for them and then use the silicon sealer on the back and take your time as some of the sealers need time to cure before you use it, and install the mirrors back again. If the holes are big you may need to open the inside cover of the doors and use another washer with a casket to secure the mirrors…let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

Posted on Sep 27, 2009

  • Norman Al-Anbar Sep 30, 2009

    Hi,



    This post was referred to me again and I taught that you took someone recommendations of using “Foam” to avoid the leak, anyhow, the foam may not be good to use metal on metal and that increase the rust and fiction between them. My recommendations again is to use he premade gasket that you cut to size and silicone sealer. let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

  • Norman Al-Anbar Oct 01, 2009

    Ok I did not get favorable grade but I will still try to help…first you need to stop the water now from coming in the car so you need to have a temp fix tell someone come with an answer that work for you, and that by drilling a hole at the bottom of your door to the inside that way any water comes not it will drip to the outside. Second I need to know if you have as rust issue or not, third did you try the rubber casket and make one to be installed between the mirrors and the door? It is specially made to hold high pressure and it should stop any water from coming in if it is cut to size and secured good… see what will happen then we can go to the next step, remind you that we can not see any information that passed between you and other techs....let me know if that work for you and please do not forget to rate my service so I am able to continue providing same...god bless

    1 thump not related

    2 thump related but no recommendation

    3 thumps related worked some issues

    4 thumps related worked all issues and satisfied

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