Question about 1996 Mercury Grand Marquis

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Heater switch under hood

I can't get heat inside the car.

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I tried to flush the radiator but still didn't get any heat yet.


Posted on Dec 23, 2008

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How do I control the ac/heater "under the hood" near firewall? The ac/heat do not switch out when knob turned. Had broken knob and cable replaced but problem lies deeper. Was told you can do this manually...


the ac/ heater controls is inside ur instrument panel/ u need to remove the instrument panel to give u access to check whats wrong with ur controls and u need set of tools to do that and be careful when removing panel boards as it easily breaks....

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My 94 gmc sierra has no heat, new heater core and blower works, also has new termostat...any suggestions?


You Might want to Check your Heater Control Valve,Its located under your Hood between 1 Heater Hose and your Water Pump.Its Vacum Operated and could be manual as well.Have someone turn your heat on and Off while you watch under the Hood at the Heater Control Valve to See if you see it Move.Or could have a Leak.More than Likely its Frozen Closed not allowing the Hot Water to Run Through Your Heater ore ,Which Results in No HOT AIR blowing inside. Try This 1st.

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1982 cordoba blows cold air ,no heat inside,the slide bar for hot and cold seems to have broken inside the dash ,how can i get heat in car ,the car has never been winter driven,seems some kind of door...


the valve that control the heat is run by a cable from your heater assembly is located out under the hood,follow the two heater hoses to the fire wall,you will see one hose has a valve in it,one position lets water flow,the other doesn't.

Dec 27, 2009 | 1980 Chrysler Cordoba

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I have no heat when I turn on my heater blower on a 99 silverado 1500


Two things come to mind one the flap on the inside of the air duct is not switching over to allow heat to come through. Second your heater core could have a blockage. Go under the hood find both heater hoses run your truck till it reaches normal operating temp then feel both heater hoses one at a time. If one feels very hot and the other feels cold or even luke warm you have a blockage.If they both feel hot then look into the duct works under the dash. There should be a valve that switches the door between your heater duct and your ac duct that may not be operating properly. Some valves are vacume actuated so look for a broken vacume line.

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1 Answer

2005 chevy truck a/c works cant get heat blows cold


This sounds like a valve problem, or a heater/ cool air door stuck.
Many GM vehicles, have under the hood, a valve, it is electronic or vacuum controlled. When you switch the lever to heat, this valve opens, thus letting hot water flow through to the heater core.
On some newer models, there is a door (flap so to speak) within the interior compartment. This flap opens and closes between heater core and interior, thus controlling hot air flow.
Have you check to insure there is sufficient coolant in the system?
Low coolant levels will also cause no heat, but will also show signs of engine running warmer, sometimes much warmer than it should.
The valve under hood was as used on my 1995 Astro van. the mechanism looked to work as you could see shaft move in and out, problem was the diaphram or flap in valve on end of shaft (inside valve and not visible) was detached.
The other method, interior door or flab within heater box assembly was a problem on my 1998 Ford Expedition.
Yours, being GM, I would check for this valve under hood. It will be somewhat obvious in most cases as it will have heater tubes running into it and from it into firewall.

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Most cars have a cable operated switch under the hood which allows hot coolant to flow into the heater core when the switch is activated. This switch is usually located close to the firewall behind the engine. Look for coolant hoses running to it.

Have someone inside the car change the heater control to heat while you watch the switch. If it's operating correctly, you should be able to see the movement. If this switch does not move, hot coolant is not entering the heater; and you will not get any heat.

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1 Answer

1998 ford explorer limited


look for a broken plastic vacuum line under hood, vacuum is what controls the heater controls inside the car

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1 Answer

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When you go from a/c to heat on the controls it is supposed to flip the door. It will be under the dash on the passenger side. If you look at the firewall under the hood to locate the heatercore box, it is on the other side..... inside the car. I hope this isnt to confusing. I had a vehicle once that I had to manually reach under there and flip the door to change from heat to cool and vice versa. Hope this helps.

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Hi There, If the fan blows only cold air, then you might have a restriction on the heater core. The heater core is like a small radiator inside your dash. The coolant flow through it can be restricted by corrosion. The lack of flow of coolant through the heater core will result in a lack of warm air inside the car. Flushing out the heater core may help. If not, you will have to replace it. I would say though, 80% of the time the cause is just restriction. Get the heater core flushed and I am sure you will get your heat back. MIke

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