Question about 1993 GMC Safari

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Heat I have a 93 gmc safari which will pour a hugh amount of white smoke on start up. I have checked the pvc system and it is clear. Also when the van is idoling the heat will fade out. But as soon as i start driving the heat will come back. Ant ideas?

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  • Anonymous Jan 29, 2009

    This is caused by worn valve guides/ seals. Mine has been doing this for years. Not a problem. When the engine sits over night, oil will run down the stem and when you start it in the AM the oil on the top of the piston will burn off. I still only use 1/2 qt. oil between oil changes and with 230,000 miles, it is still running great.

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The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Posted on Jan 14, 2009

  • blueextc3221
    blueextc3221 Jan 14, 2009

    Additionally, white smoke in the exhaust is indicative of coolant in the combustion chamber - ie blown head gasket, or cracked header. Seek professional repair.

  • blueextc3221
    blueextc3221 Jan 14, 2009

    BLUE SMOKE is the result of burning oil - NOT as CRTN has suggested for your WHITE smoke problem.

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Sounds Like Your Head Gasket Smoke Is Cause By Oil In The Fuel. You Can Try Buying Some Head Gasket Repair Solution From Your Local Auto Part Store And Put It In Your Oil.

Posted on Jan 14, 2009

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