Question about 1984 Ford F 250

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6.9L engine thermostat. Does it have one or two thermostats. I am not getting any heat

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  • tim mcgrath May 11, 2010

    only has 1 thermostat, are your heater hoses hot? check your heat control valve, located in heater hose between heater core and motor, cable could have came off

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Only 1 thermostat. Ck heater hoses and verify both sides are hot. The heat blend door may be stuck allowing teh a/c to overpower the heat in cold weather.

Posted on Feb 15, 2010

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2000 Dodge Ram 1500 Sport V8 Mag, it is over heating but I get a code of P done, could you please tell me where to start?


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You are correct in your suspicions.
The thermostat blocks flow thru the radiator to help the engine warm up. The coolant still flows thru the block with the thermostat closed. If you remove the thermostat the cooling system should flow thru the radiator and stay below 160 degrees if the air temp is below 90.
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On my 2004 Grand Prix, my car has to be running for at least 45 minutes for some heat to work.The yellow light by the heater blinks while the blower comes on and goes off repeatedly until the light is...


It is possible that your thermostat is stuck open. Normally, the thermostat remains closed when starting cold, confining coolant to the engine block and cylinder head until it heats up. Once the coolant in the block is warm (usually within 10 minutes), the thermostat begins to open and let coolant flow into the radiator to cool it down some. A properly operating thermostat will continue to cycle until the coolant reaches the operating temperature of the thermostat--usually around 180 deg F. Then the thermostat will continue to adjust its opening to maintain that temp.

Thermostats can get stuck in both closed and open positions. When stuck closed, the engine will quickly overheat. When stuck open, the engine will take forever to warm up--especially in cold weather because the coolant is continually pushed into the radiator and cooled off before it ever has a chance to get warm. Changing the inexpensive thermostat may help correct your condition.

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Not Familiar with vehicle but can give you some basic info.The Thermostat could be on top or bottom of engine.It is in a bell shaped housing,follow the Hoses from the Radiator.If you get heat when the Engine shows warm and you don't overheat it's not the Thermostat.If your not getting heat check the level of coolant first.If coolant is low you wont get heat or low heat.If your overheating it could be other problems,Blown Head Gasket.Clogged Radiator,insufficient coolant.Good Luck.

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My 2005 Grand Prix has no heat and my gas mileage is awful. would changing thermostat fix problem. also at night not sure if this has anything to do with problem only my blue temperature arrows light...


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1 Answer

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Most likely the thermostat. The heater bypasses the thermostat. If the thermostat is blocked the only cooling is via the heater matrix. To check start the engine with the heater off and put your hand on the thermostat housing when the thermostat opens you should feel the housing get hot. If it doesn't the thermostat is faulty.

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1 Answer

92 isuzu rodeo overheating still


hey
u says that u didn't replace the thermostat yet
Your thermostat is sticking. DO NOT DRIVE if the car overheats, you can do some serious engine damage, if you haven't done so already. Get the thermostat changed out immediately.

What happened is your thermostat is sticking. It was stuck and you saw it overheat (and should have stopped immediately). The added pressure from having a stuck thermostat pushes the fluild into the overflow.

The temperature may have gone back to normal if the thermostat "finally" opened. However, since the thermostat is sticking, it is unreliable and I would get it replaced.

Driving when the engine overheats can easily cause gaskets, such as the head gasket to fail and heads to warp. If this has occurred, you're looking at a new engine.

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