Question about 1997 GMC Suburban

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Over heat coolant leaks threw inlet hose to heater under dash .now no heat whenturn on why when overheating

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  • waynepuen49 Sep 07, 2010

    I agree wasn't sure at first' thank's for the assurance

  • waynepuen49 Sep 07, 2010

    I agree. info very helpfull.



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The hoses attach to the heater core which is under your dash. The heater core may have to be replaced. Try changing your thermostat first. To find the thermostat, follow the upper radiator hos to where it meets the thermostat housing. It has 3 bolts on it. The thermostat is under the housing.

Posted on Sep 07, 2010


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No heat in 1999 sunfire

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The problem sounds like either the inlet or outlet hose to the heater core is cracked or split. Or the heater core itself is at fault. Need to inspect the hoses from engine to the firewall going to the heater core for damage. If no leak from the outside then problem will be on the inside under the dash. Hope this will help you.

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Overheating can be caused through a lot of things But 1st on the heater pipe going into the cab ,through the firewall there is 2 heater pipes 1of them has a air valve on it so when you turn to hot the vacuum opens the valve and lets the hot water come through.or it could be under the dash on inside of firewall by heater inlet.BUT check your radiator for dust and dirt in the outer cores/Loose fan balt/water pump falty/Head gasket leaking/ plus others will all cause
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So let me know how you get on Ron

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Sounds like the heater core (a small radiator of sorts under the dash) is leaking or a hose going to it is leaking. If in a warm climate, you could bypass or block the heater hoses temporarily. Their only purpose is to make heat avail to interior of car. The 2 heater hoses either connect to feedthru's at the firewall or simply pass thru the firewall to the heater core. Every car I've seen has it on passenger side.

Peer up under the dash, it should be clear where it's coming from.

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