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It is a common concern of ford crown victoria owners to state something to the effect of "my blower motor only works good on the high speed". In which case, the blower motor might not spin on any speed other than high. Or the blower motor might spin on speeds other than high, but turn rather slowly and move minimal amounts of air. The most likely culprits here are the blower resistor under the hood and it's associated electrical wiring pigtail.

Here's the inside of our project car, a 1997 crown victoria police interceptor p71.



And here are the manual climate controls.

We also have an aftermarket radio installed too. That big black button in between the climate controls and the radio is to pop the trunk open. Civilian vehicles would have a clock there instead of a button.



Here's the wiring pigtail kit that is going to be installed.



Blower Resistor Wiring Pigtail Part Numbers



Ford Service Part Number
Motorcraft Part Number
NAPA Part Number
SMP Part Number
(Standard Motor Products)

Comments
1U2Z-14S411-NA
WPT-114
ECH-EC4

(Manufactured by SMP)
S-630

Blower Resistor Pigtail
1990-mid2005 crown victoria and grand marquis
with manual climate controls
without eatc

And a closeup of the part number tag.



And the instruction manual that ford includes with the wiring pigtail kits





Here are a couple closeup pictures of the new blower resistor pigtail











The blower resistor wiring pigtail is also avaliable aftermarket from NAPA with color coded wires. But the napa blower resistor pigtail does not include the wire crimps or adhesive heatshrink tubing like the resistor pigtail kit that you can purchase at your local ford dealership.





And here is the blower resistor pigtail after being removed from the blower resistor.





Here's the harness with the resistor pigtail cut off.



And after the wiring insulation has been stripped off the ends, the heatshrink tubing slid on, and the crimp connectors crimped on.

Remember to slide the heatshrink tubing on the wiring before crimping the connections together.

Also, make sure to stagger the splices at different locations so that you don't end up with a really huge diameter glob of crimp connectors next to each other.



And after heating a the heatshrink tubing to shrink it down in size.



Now the wiring is placed back inside the black looming and wrapped with some electrical tape.



And now the wiring is placed back in the proper position to connect to the blower resistor and then slid onto the resistor connector.



And a few more pictures from various angles around a 1997 police cruiser engine bay.









The new pigtail install looks quite professional. Most people would not be able to tell that a new wiring pigtail had been spliced on at a quick glance.






Blower Resistor Part Numbers



Ford Part Number
Motorcraft Part Number
NAPA Part Number
SMP Part Number
(Standard Motor Products)
Comments
E3AZ-19A706-A YH-1702 ECH-BR307

(Manufactured by SMP)
RU-403
Blower Resistor
1990-mid2005 crown victoria and grand marquis
with manual climate controls
without eatc
manufactured before 12/06/05
4W7Z-19A706-A
YH-1717

RU-408
Blower Resistor
2005-2010 crown victoria and grand marquis
with manual climate controls
without eatc
manufactured from 12/06/05
Will not work in 1990-2004 crown victoria evaporator housings







And here's where the blower resistor is located.

Note that this particular car is a 2000 crown victoria police interceptor. And that various parts have been removed including:
-Heater core hoses
-Windshield wiper cowl
-Engine assembly
-Transmission assembly





And here's a 1998 crown victoria police interceptor with the blower resistor removed.

With the engine installed, note how limited clearance is between the back of the valve cover and the a/c evaporator housing.



And the blower resistor itself.



The wire wound coils are constructed of nichrome wire like you'd find in your kitchen toaster



Here you can see the thermal fuse which blows if the temperature gets above 250°F. Once it's blown, it does not reset and the resistor assembly must be replaced.



A couple of the connector pins were somewhat rusty on this particular resistor.



And a diagram of the components inside the blower motor resistor assembly



Here are a few pictures of a burned resistor wiring pigtail from a 1998 police interceptor. The blower motor did spin on speeds other than high, but spun rather slowly.









While you are replacing the blower resistor, it would be a good idea clean debris that may have lodged on the evaporator core. You can do this by removing the blower motor and reaching in with your hands to pull off any remaining debris, and then washing off the remainder using a garden hose. Your new blower motor resistor will have a rather short life if an inadequate amount of air is flowing by to cool it.

To remove the blower motor, remove the 4 retaining fasteners and pull forwards



Now that the blower motor is out, you can reach inside to the right and get the debris off of the evaporator core.



You don't have to pull the whole evaporator housing out of the car like this. But it's difficult to get good pictures inside the evaporator housing with the housing still installed on the car. If you would like to view some additional pictures of the evaporator housing, click here.



The evaporator acts like an air filter. In this case it caught pine needles and various plant pollens from the outside air. And when on max a/c it had recirculated from the interior passenger compartment flowing through it and caught linen debris from the passenger's clothing. Passengers have been prohibited from smoking cigarettes inside this vehicle, so there aren't any tar deposits on the evaporator core.

These cars do not have a seperate cabin air filter to contend with like in some other fords.



And here are a few pictures of a 1994 crown victoria with the dashboard removed. The object here is to illustrate where the blower motor resistor is in relation to the interior of the car.

First loosen the dashboard from the body of the car
(picture courtesy of Steve83 on www.crownvic.net)


Then seperate the wiring harnesses and the dashboard can be removed completely
(picture courtesy of Steve83 on www.crownvic.net)


Driver's side
(picture courtesy of Steve83 on www.crownvic.net)


Passenger's side
(picture courtesy of Steve83 on www.crownvic.net)


Passenger's side closeup
(picture courtesy of Steve83 on www.crownvic.net)


Now pull the heater plenum off of the firewall and the back of the blower motor resistor is visible
Note: Heater core present
(picture courtesy of Steve83 on www.crownvic.net)


The back of blower motor resistor from a different angle
Note: Heater core removed
(picture courtesy of Steve83 on www.crownvic.net)


Blower resistors for 2005-2010 crownvics



Here are a some pictures of the blower resistor used in the mid-2005 and later crownvics with manual climate controls. There are no obvious problems with this resistor or wiring pigtail, but the donor car no longer needs these parts anymore since it was wrecked and is being "parted out" by a salvage yard.

































Blower resistors for 1980's "box body" crown vics.



GM_Guy on www.crownvic.net had to replace a blower the blower motor resistor in his 1989 grand marquis and made the following observations:







And here is the ECH-EC75 wiring pigtail associated with the ECH-BR311 blower resistor for 1980's crownvics with automatic temperature control.








Notes:

Ford Aerostar
1986
1997
Ford Bronco
1986
1996
Ford Bronco II
1984
1990
Ford Crown Victoria
1990
2005
Ford E Series Fullsize Van
E-150 E-250 E-350 E-450 E-550
1986
2004
Ford Excursion
2004
2004
Ford Explorer
1991
1994
Ford F Series Fullsize Pickup
F-150 F-250 F-350 F-450 F-550
1986
2003
Ford LTD
1981
1983
Ford Mustang
1982
1993
Ford Ranger
1983
1994
Ford Taurus
1986
1995
Ford Thunderbird
1982
1997
Ford Windstar
1995
2003
Lincoln Continental
1982
1983
Lincoln Mark VI
1981
1983
Lincoln Navigator
1998
2001
Lincoln Town Car
1982
1997
Mazda Navajo (Ford Explorer Sport Clone)
1991
1994
Mazda B2300 (Ford Ranger Clone)
Mazda B3000 (Ford Ranger Clone)
Mazda B4000 (Ford Ranger Clone)
1994
1994
Mercury Capri
1982
1986
Mercury Cougar
1982
1997
Mercury Grand Marquis
1983
2005
Mercury Marquis
1983
1986
Mercury Mountaineer


Mercury Sable
1986
1995

Notes:


Blower motor replacement notes:



The hole cut into the evaporator box to mount the blower motor hasn't changed since the early 1980's crownvics. However the blower motor electrical connector has been revised a few times over the years.
If your blower motor doesn't spin at all, here are a couple troubleshooting tips:
In the 1992-1997 crownvics, the factory shop manual says to remove the engine coolant reservoir to obtain sufficent space to be able to slide the blower motor out. Unfortunetly, the nuts are usually rust-locked to the mounting studs which hold the reservoir to the fender apron. This means, you can't remove the coolant reservoir without destroying it. However, there is an alternate solution that is not documented in the factory shop manual:
In the aftermarket, it is common to require you to reuse your old blower wheel on your new blower motor. However, you'll often end up destroying your old blower squirrel cage attempting to get it off the blower motor shaft. So you will probably want to order a new blower motor wheel before you start installing your new blower motor.

In the aftermarket, there are also some really noisy blower motors avaliable. If you source from the aftermarket, you might want to power up the new motor before you attempt to remove your old one. If your new motor seems too noisy, visit another parts store and get a different one from a different manufacturer. If your blower motor already has the blower wheel installed on it, be aware that these are high torque motors and the blower motor will want to move around a bunch when you apply power to it.

A bad blower motor will often take out the blower resistor when it fails. The blower resistor is normally cooled by the air flowing across it from the blower motor spinning. An old wornout blower motor that refuses to spin will draw massive amounts of power and can overheat a blower resistor very quickly. You will wear the bearings and brushes in your new blower motor at an accelerated rate if your blower resistor is damaged so that you're forced to run the blower motor on the "high speed" setting whenever you want heated or air conditioned air.

Having a non-functional blower motor is a safety issue. It's very dangerous to drive during the cold winter months when your windshield is covered in ice or snow because you can't heat the glass to melt it off. It's also dangerous to drive during the humid summer months to drive with foggy windows. And in some parts of the united states, you could end up with heatstroke from not having a functional air conditioning system during the hot summer months. None the less, some penny pinching car owners drive around for extended periods of time without functional blower motors.


Question & Answer



Is all the above information really necessary?

This article was composed with the diy shadetree mechanic in mind and contains lots of background info. If you're a professional mechanic, all you will probably need to know are the part numbers for the blower resistor & blower resistor pigtail.

How hard is it to replace the blower motor in a crown victoria?

This is very easy task in the 1998 and later crownvics if you get a motor that already has the blower wheel installed. Just remove an electrical connector, remove four bolts, slide the old blower motor out, and reassemble everything with your new blower motor. Do be warned that replacing the blower motor is a more involved task on the 1992-1997 cars, because you'll need to drop the fender apron down some like mentioned above.

How hard is it to replace the blower motor resistor in a crown victoria?

This is a difficult task in the 1992-2010 crownvics. These cars use the 4.6L engine that has a tall engine valve cover located in front of the blower resistor along with some heater core hoses routed near the resistor too. You will need a 1/4" ratchet, some extension bars, some swivel adapters along with lots of patience for this task.

Should I have my local ford dealership install a new blower resistor & pigtail for me?

If you do not like frustrating hands-on car projects, this would be a really simple solution. Just describe your problems to the dealership service advisor, hand them your car keys, and pick up your car when it's ready a while later. Do be warned that your wallet will become a few hundred dollars lighter if you choose this option though.

Should I acquire a replacement blower motor from the local salvage yard?

This can be a good option for some people. Your local salvage yard probably has a bunch of good working blower motors on hand ready for immediate delivery. Do be warned that some blower motors will have a tobacco odor to them if the previous owner of the wrecked car was a cigarette smoker though.

Should I acquire a replacement blower motor resistor from the local salvage yard?

No. Most of the crownvic blower resistors and blower resistor pigtails at your local salvage yard are likely to be in similar condition to your broken ones. Also, most full service salvage yards don't sell cheap small parts like blower resistors separately.