Grand marquis heater stuck on

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Grand marquis heater stuck on

Can not change the blower speed from high it will even blow when the key is in the acc prosition. Kelly answered 4 years ago. Wayne answered 4 years ago. Rowefast answered 4 years ago. There is a resistor that controls the blower motor speeds.

When you turn your switch low, medium, high, the resistor regulates the amount of voltage to the blower motor to acquire the desired speeds. In the accessory position the blower motor should be off. When mine went bad the blower motor kept on running on high, even with the key out of the ignitionl. Colin answered 2 years ago. Glad to learn of the above. My fan blows high even in the Off position!

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Does the whole control module have to be replaced, or can resistor be replaced. Rowefast answered 2 years ago. Chances are the blower motor resistor would be the culprit there Colin. Not to say the fan switch may be bad without looking at it. In order to keep driving without the high fan speed irritation, I removed two fuses in box under dash.

There is a rather. Owner's manual shows chart of functions and placement by number. Car ran fine without fan blowing. As long as car speed was sufficient to move air, cabin was warm. Today I pulled the resistor unit to see if there was water or rust since the problem occurred when sleet and snow hit us. There are rows of vanes or ribs as on air-cooled engines with some type of large button in the center, all sitting on what looked like a circuit board- all looked dry.

I used a hot air blower for about 30 seconds, just in case there might be some moisture in there, hoping that might cure the problem so as. So, put it all back together just as darkness was falling. Will know tomorrow if my climate control is back to normal. It worked! Praise God for giving me a mind to think and reason. Great day!

Guru5BLGM answered 2 years ago. Hey Colin, it appears I have the same issue with my Grand Marquis as you did.I do not know if the blend door pass side behind glove box is working. Any suggestions? Check out the diagrams below. Please let us know if you need anything else to get the problem fixed.

A little tough to get at but I made it happen. Was this answer helpful? The compressor has been checked and the clutch is engaging properly and the Freon level is fine.

I heard that it could be possibly be an expansion valve block issue behind the dashboard. Please respond with possible answer. Now, changed out old battery and AC is blowing warm air again. How do I reprogram? That is what I would do. Electronic Automatic Temperature Control Module Self-Test: The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals.

A diagnostic tool must be used to retrieve these concerns. The EATC module self-test will detect concerns in the system control functions and will display hard DTCs in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4 C F when carrying out the self-test. If the temperatures are not within the specified ranges, false in-vehicle temperature sensor DTCs will be displayed.

The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF display blank. The vacuum fluorescent display window will show and all function symbols for one second.

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Always exit the self-test before powering the system down system turned OFF. Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs. How do I manually switch it to make the air to come out of my AC vents?Brian answered 2 years ago. My car 98 grand marquis is blowing hot air even when it's put to cold.

It use to blow cold if battery was taken off but when switched to hot air it won't switch back to cold I bought a new compressor.

grand marquis heater stuck on

It blew cold air for like a week or 2 and it just stopped and started blowing hot air. What do I need to do???

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I have a mercury grand Marquis, everything digital Trying to figure out y don't I have any air or heat coming threw my vent even though I can hear the fan there still no air and the only h My Grand Marquis ac heater is stuck on defrost. I've read I should look for a vacuum leak?

Where should I look? Do I need to pull the dash out? Replace vacuum switch? Do I look under the hood? I have a different car. Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus.

Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies. Blowing hot air. Ac won't work. Heater is stuck on. Report Follow. Mark helpful. Your Answer:. Upload Photo Photo optional. Related Questions. Start a new Mercury Grand Marquis question. Sell Your Car Yourself With a simple, secure transaction. Get Started. Search Mercury Grand Marquis Questions. Mercury Grand Marquis Experts. Find great deals from top-rated dealers TM Search.

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Ford Crown Victoria/Mercury Grand Marquis Climate Control

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June I own a Crown Vic, the heater control went out about 2 years ago, it just went out again. When they go out all heat and air conditioning go to the defroster. Ford tells me this a safety feature. So when it quits you will always has a defroster, the heat and air are only a comfort issue.

grand marquis heater stuck on

Nice huh. Which tells me they should be put on a recall. When the guy replaced mine 2 years ago he told me they were very poorly designed. To compact area, so over heats and burns out. I'm still looking for the part. This the second time my has quit and both times it blew out floor, vent, or defroster and would speed up and then slow down.

It didn't matter what it was set on. Its not stuck, your heater control finally quit completely.

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Ford tells me its a safety feature.One of the most common and inconvenient problems with the Mercury Grand Marquis is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working.

If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core.

At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Grand Marquis, this process has failed in one way or another.

There is almost never a situation where you would need to take the radiator cap off of the radiator to add coolant. The exception to that would be when you would have reason to believe that the hose going from the reservoir to the radiator is clogged. While not having enough coolant may make your engine run hotter, it can also cause your Grand Marquis to not be able to create enough heat. You can verify this by checking the coolant level by taking a peek at the overflow reservoir. The overflow reservoir will be connected to the radiator by a tube coming from the top usually right by the radiator cap.

Some vehicles only have full hot. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up.

Sometimes when a thermostat goes bad, it stays stuck open. This allows the coolant to continuously enter the engine. If your Grand Marquis has a built in temperature gauge, take a look at it and see if it is in the spot it is normally in after a bit of driving.

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The heater core itself can go bad. Over time, they are known to clog and fail. Without the warm coolant going through it, there can be no heat.

Mercury Grand Marquis Leaking Heater Core Diagnosis

A bad heater core can also leak, so watch out for that. There are two hoses coming to and from the heater core. They both should feel warm or hot to the touch with the engine on. If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged.

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If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.One of the most common problems that can happen to a vehicle is a heater core leak. If your Mercury Grand Marquis has a leaking heater core, it is not a breakdown risk. Although, it is necessary to make sure that the lost coolant is replaced. It can cause damage to the vehicle in other ways, and should be addressed as soon as possible.

A heater core is a small radiator that runs hot coolant to the inside of your Grand Marquis. It functions exactly the same way the radiator does. There is a line of hot coolant coming from the engine, and there is a return line.

The blower motor runs air over the heater core and the cabin warms up. Temperature is controlled by the blend door, which the driver controls. The more the heat is turned up, the higher the percentage of air passing over the heater core. Here are the most common symptoms of a bad heater core in your Grand Marquis:. The nose and ears are our best auto diagnostic tools. You can learn a lot about what is going on with a vehicle by what smells and sounds different.

A heater core that is slowly leaking will do damage to the sheet metal under the carpet. The heater core is itself is almost always located on the passenger side of the vehicle. Turn on the blower motor and follow the sound. They are always close to one another. Check the floorboard directly below the heater core and see if it is wet.

grand marquis heater stuck on

If coolant is allowed down there for a very long time the floorboards can rust. It could also be a sign that you are almost out of coolant. Depending on how old and complicated the vehicle is, the blend door may be operated by cable, or it could be operated by an actuator. Foggy windows are a sure sign of a bad heater core. Antifreeze is harmful and can be fatal if swallowed. An overheating engine can indicate that the heater core is leaking. But, there are a lot of other reasons why a vehicle could overheat.

If it is full and overheating, take a look at the thermostat first. If there is anything that you would like to add, please feel free to leave a comment below. Coolant Smell The nose and ears are our best auto diagnostic tools. Foggy Windows Foggy windows are a sure sign of a bad heater core. Overheating An overheating engine can indicate that the heater core is leaking.Earlier the resistor was changed due to no fan at all worked for 4 months now fan motor blowing on high only.

Could it be the switch or resistor or motor not sure can you help. The most common cause here is a bad resistor, but since you are confident that isn't the problem, it is likely the switch.

However, I did have a situation once in a dodge caravan. The fan motor itself was causing a voltage problem and ruining the resistors. You can use a simple test light. Unplug the wire to the resistor. Should have a 5 or 6 prong plug. Turn the key to the run position. Probe each pin with the light as you change the setting on the switch.

If it lights up at each setting that means it is working and the resistor is bad. If not, then the switch. If the resistor is new and not working, or if there are any melted connections, then the fan motor is the likely culprit. Rocky answered 3 years ago.

My diagnosis took a while but I finally fixed mine. The problem and solution are simple but hard to get to. What caused my high blower problem is that an important resistor in the blower resistor module under the hood loses connection with the EATC.

This resistor sends back the blower voltage which tempers the EATC speed control. Without this signal, the EATC control range is offset too far to the high side to allow control. If you can take out the blower resistor module under the hood, the repair is easy. The actual failure is that the resistor module connector pins are soldered to the board with very little solder. Over time, stress and flexing crack the solder joints making an intermittent contact.


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