How to replace the climate control on a Mercury Grand Marquis?

The vacuum harness connection ports relax after several years. You can replace the vacuum harness (F5VY-19C827-A) $20, or just clamp it tight with 2 ten inch tie straps from the Lowes or Home Depot. Pull the trim covering the control head straight out. remove the control head (4 screws).

What happens if you lose antifreeze with no apparent leak?

Losing Antifreeze With No Apparent Leak. Whenever a vehicle loses antifreeze, also known as coolant, the usual expectation leads the owner to check for evidence of leaks at all the coolant connections and components. Obvious coolant leaks can usually be found in the form of puddles left on the pavement.

Why does my air conditioner keep leaking antifreeze?

Antifreeze leaks can be caused by a variety of things but the two most common factors are age and dirty coolant. Dirt or oil in your coolant can accelerate wear in your system, leading to leaks in your water pumps, at gaskets, or at o-rings. Flushing your cooling system is the best way to stop this type of leak.

How can you tell if your antifreeze is running out?

However, there are a few more subtle ways that you can detect an antifreeze leak. If you’re antifreeze keeps running out quickly, you’ve almost definitely got a leak. This is much different than the slight decrease in coolant levels that you’ll notice at regular oil-change intervals. Sometimes a leak may not be visible.

When did the Mercury Grand Marquis start overheating?

Share it! The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often trigger the check engine light and low engine coolant warning light.

How often do you lose antifreeze on a Mercury Grand Marquis?

Lose about 1 gallon of antifreeze every 3 weeks. My mechanic says this is a common problem. Ford should be embarrassed and replace all for free. The engineer that designed the manifold and the manager that approved the design should own one of these cars for the rest of their lives.

What causes a check engine light on a Mercury Grand Marquis?

The 1996-2001 Mercury Grand Marquis with a 100% plastic intake manifold is known for engine overheating, even with normal use, and a coolant leak from the front of the manifold. This will often trigger the check engine light and low engine coolant warning light.

Where are the fuse panels on a Mercury Grand Marquis?

Here you will find fuse box diagrams of Mercury Grand Marquis 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 and 2011, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

What’s the problem with my 2003 Grand Marquis?

I just finished fixing a 2003 Grand Marquis for air blowing out the defrost only. This is the goverment mandated failure mode. The problem is that the vacuum harness is leaking vacuum where it connects to the back of the conrol head. The vacuum harness connection ports relax after several years.

Where is the vacuum harness on a Mercury Grand Marquis?

Feed a tie strap around this part so it clamps the vacuum harness to the control head. I put one tie strap on either side of the black vacuum supply hose in the center of the harness. Operate the controls to be sure it is fixed. If you wish, you can disconnect the vacuum harness under the dash for easier working room.

Is the self test on a Mercury Grand Marquis?

This shows how to trigger the self test on an Electronic Automatic Temperature Control (EATC) module in a Mercury Grand Marquis. This is a 1998 model but the same unit is used in many other cars (including other Panther platform cars like Ford Crown Victoria and Lincoln Town Car)

How long has the Mercury Grand Marquis been in production?

In continuous production for 36 years, the Grand Marquis was the longest-produced Mercury. In total, nearly 2.7 million were produced, making it the best-selling vehicle sold by the brand. Among Ford Motor Company models in North America, only the Ford Econoline, Ford Mustang, Ford Thunderbird, Ford F-Series,…

When did Mercury stop making the Monterey model?

For 1975, Mercury discontinued the Monterey (a Mercury nameplate since 1950), with the Marquis becoming the sole full-size Mercury product line. To expand its full-size model range upward, the Grand Marquis became the highest-trim Marquis, slotted above the Brougham.

Where are the climate controls on a Mercury Grand Marquis?

Select the placement of the heating or air conditioning control part: Select an entire interior climate control unit faceplate or an individual knob or switch that fits onto the dashboard. There are also products that fit behind the dashboard panel trim of the Mercury Grand Marquis LS.

When did the Mercury Grand Marquis become stand alone?

The Grand Marquis was the premium trim level of the Marquis product line and then became a stand-alone model in 1983. After driving your Mercury sedan for many years, the controllers for the heating, ventilation, or air conditioner may need to be replaced so that you can maintain climate control and interior comfort of the vehicle.

How does the heater work on a Mercury Grand Marquis?

Control the temperature of the cabin air: The heater and air conditioning controls for the Mercury control the temperature of the cabin air. They connect with the engines radiator, thermostat, and air conditioner compressor for measuring the temperature of the cabin.

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