Question about 1996 Buick Park Avenue
The brown sludge you're seeing is the result of GM/dealers/repair shops installing cooling system sealer tabs in the cooling system. This sludge is NOT related to the use of dex-cool coolant. The cooling system sealer tabs are brown in color, and resemble dirt after they are crushed and poured into the cooling system, and pretty much turn into nasty brown mud in the cooling system. I have seen this on many vehicles. The problem you are having with your heater is most likely related to the sludge you are also seeing in the radiator. The sealer finds its way into the heater core and plugs it up, resulting in cool air instead of hot air. The best way to clean it out is to remove the heater hoses from the heater core and back flush the heater core with a garden hose. You will see a lot of nasty brown junk come out of the heater core when you do this. I have found that cooling flushes that dealers and independent shops sell are not effective at completely removing this sealer, and may have to be done multiple years in a row to get most of it out. Even then, there may still be sealer lodged in the system.
Your description of the heating and air system defaulting to the defrost and floor positions tells me that there may be a vacuum leak in the vacuum supply hose between the engine and the interior control (HVAC Programmer, if I recall correctly). The default position is defrost when the system loses vacuum. You may want to have your local shop check that and make sure you're getting vacuum to the HVAC controls.
Posted on Oct 20, 2013
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Posted on Jan 02, 2017
U HAVE WHATS CALLED A BLEND DOOR IT CONTROLS WHICH VENTS THE AIR GOES TO IN SOME CASES MORE THN ONE U NEED TO FIND OUT WHICH CONTROLS THE FRONT DASH
Posted on Aug 19, 2009
SOURCE: Oil sludge in radiator
The 3100 and the 3400 are noted for the intake gasket going out. You can usually see it leaking at the left front and right rear of the intake as you sit in the car. Look along the slanted area of the intake manifold where it joins with the heads. If you are tight on money, the repair is generally around 5-700 dollars, buy Bars Leak Head repair. It will take two days to fix, however if you follow the directions to the letter, you will not have the problem again. I have repaired head gaskets that were literally leaking water that you could see and two years later it is still running. Remember to follow every step on the bottle to the letter or you have wasted your time. The only one you do not have to worry about is the step where it tells you to remove the plug at the cylinder that is leaking since you are not leaking at a cylinder.
Hope this helps
Posted on Apr 13, 2010
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