Question about 1998 Lincoln Mark VIII

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No heat Where is the thermostat in my car? I have no heat or defrost whatsoever. Could this possibly be the problem? Help!!!!

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Removal
no heat - swc~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

  1. WARNING: Never remove the pressure relief cap under any conditions while the engine is operating. Failure to follow these instructions could result in damage to the cooling system or engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system or degas bottle, use extreme care when removing the pressure relief cap from a hot cooling system or degas bottle. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly until pressure begins to release. Step back while the pressure is released from the cooling system. When certain all pressure has been released, remove the pressure cap (still with a cloth).
    Drain the engine cooling system so the engine coolant level is below the water thermostat (8575).
  1. Remove the hoses from the water inlet connector.
    1. Disconnect the lower radiator hose (8286).
    1. Disconnect the hold-down clamp (12270).
  1. Remove the water thermostat.
    1. Remove the bolts.
    1. Remove the water thermostat and O-ring.
  1. Inspect the O-ring for damage and replace it if necessary.
Installation
  1. Follow the removal procedure in reverse order.
  1. Fill the cooling system; refer to Cooling System Draining, Filling and Bleeding in this section.
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Posted on Feb 27, 2009

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If your not over heating I doubt its your thermostat, not to say I wouldnt replace it. I do every year. Its a cheap preventative. I would start with your fan. Is it coming on when you turn on the fan controll? If not then there is your problem. just replace the fan and your done. If you have wind coming out of your vents then it is probably your heater core.

You need to go down and purchase a chilton especially if your going to be doing other DIY jobs. It has everything in your car that you can fix with pictures. It also has preventative maintenance procedures for your car also.

tepfy

Posted on Feb 27, 2009

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Have you checked the coolant level on the car? if its low you wont get any heat...otherwise it could be a stuck thermostat

Posted on Feb 27, 2009

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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.

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There is a problem with the heat, it is not working correctly. Not heating and hardly and takes forever for the defrost to work


It is a good possibility that the thermostat is stuck open. Try putting a piece of cardboard in front of the radiator and then start the vehicle if it warms up more quickly most likely the thermostat is the issue and it needs to be replaced. Do not leave the cardboard in front of the radiator as it may cause it to overheat while driving.

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okay temp is not hot enough check thermostat temp rating is it 195 degree etc. are you in a cold climate state? Maybe you need to get a thermostat of a hotter degree[four seasons 195 degree should do it]. If this is what you have (195 deg. thermo) then it might be stuck open not allowing the heat to build up. Another possibility is air in the radiator system, bleed system. This too might be of help the blend door, which is operated by the HOT to COLD lever on your climate control panel, might not be moving all the way closed to stop the cold air from coming in the mix area with the heat. Move the lever back and fourth to feel any change in heat with your hand. Put the defroster on fan on high and put one hand near the defroster vent thee other hand moving the temperature selector. Do you have some sort of heat and you can feel the difference from hot and cold, then my recommendation is to check thermo degree rating, if ok then try to flush radiator, and if that does not work --replace Heater Core. Thank you for allowing me to help you if you need me just write,Lee

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3 possible issues here,

the first is that your thermostat is stuck open, when this happens the air will barely be warm, luke warm at best, replacing the thermostat will fix this problem

the second, is that you have low coolant levels, when your coolant levels are way low, your heater core doesn't get the proper amount of coolant (if any) and the system blows cold air instead of heated air.

The third and final possibility, is that your heater core has clogged up (usually happens when stop leak or some type of radiator sealant is used) when this happens you can feel warm air when accelerating (test this by gently reving the vehicle and holding the rpm's when it is in park and holding your hands over the defrost vent to check for heat.

If you can tell me what symptom your vehicle is having I can help with instruction on how to fix it thanks cnc_couple@live.com


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