Question about 1998 Pontiac Bonneville

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I have no heat. We have changed the thermostat

I have no heat. We have changed the thermostat but nothing. are there any valves, air flow doors or servos that may not be working? Can the heater core be clogged? The A/C works fine.

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Yes to all the above . You could have any one of these problems

Posted on Dec 11, 2009

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The valve that moves to let the water into the core could be stuck. also check the under dash vac. hoses that control it.

Posted on Dec 11, 2009

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You can test your environmental station doors by using the a/c, just change the location of air, by selecting different vent locations, does it go to all locations selected? if not then you have a problem with the control switch or the vacuum doors operated by that switch. The most common door problem is the blend door, it blocks of the heater core for a/c, and opens to allow heat in the vehicle. Your heater core can be clogged, feel the hoses attached to it under the hood while the engine is warm, are they hot? if not the core could be clogged. As far as valves in the heater core lines, look at the lines themselves follow them from the fire wall to the engine connection points, if you see a valve then it may be closed, more than likely you do not have any valves in the system. What is your engine temperature? If it is staying on the cold side on your gauge, then your thermostat maybe stuck in the open position, which will only allow the engine to get to a temperature of about 120 degrees, not enough for heat, I know you put in a new one but if the guage is not showing normal temp then it may not be good. Hope this helps, let me know.

Posted on Dec 11, 2009

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1 Answer

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If they actually flushed the heater core itself you will need to check that the valve that allows coolant to flow through the heater core is operating properly. There should be a valve near the firewall where the 2 hoses attach to the heater core. In heat mode the valve should open and in A/C mode it should close. Please rate this answer, thanks.

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Have no heat. Have replaced heater core,


I don't know your vehicle, but does it have a blower door tucked in where the heater core is? If it DOES and that's broken then it could be the whole problem. It would mean it isn't switching from the A/C side of things to the heat side of them. Hope this helps, good luck! Also, just looked up the proper name for what I'm talking about, it's called a "blend door" and I think your car has one. It's what I would check, again, good luck!

Jan 20, 2010 | 2002 Ford Taurus

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No heat in the passenger compartment its not the stat not the blend door actuator not the anti freeze level and the sensing valve I got from auto zone looks like nothing under my hood help


If the thermostat and heater control valve (not the door actuator) are good. Ypu woulwant to check that the heater core is not clogged. The heater control valve is a valve in line with one of the heater hoses which allows flow or no flow to the heater core. You need to check that when temperture is on hot the hose is hot on both sides of the valve. If the valve doesn't work you will not get ant heat.

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