1988 mercury grand marquis, my A/C hi/low speed control is not working. It kn blows air when I have it in HIGH but if it gets to cold and I want to turn it down just one notch it'll turn off. Can anybody help me out with this problem?.If so, what part/s will I need to change?

Asked by Mar 26, 2013 at 09:25 PM about the 1988 Mercury Grand Marquis

Question type: Maintenance & Repair

6 Answers

tennisshoes
69,055

Mercury had 2 systems in the Grand Marquis, the ATC system and the standard. What one do you have?

I have no idea :/

tennisshoes
69,055

OK look at the temp control lever if it has numbers on the scale then it is an ATC unit, if it has only a scale that goes from blue to white to red then it is a standard.

tennisshoes
69,055

If your system is standard there is a resistor block under the hood fairly close to the blower motor, it will be held in by 2 small screws and might be a faded red color if it hasn't been replaced before. It is available at most parts stores. If it is a ATC unit the fan is controlled by a small mode control unit kinda like a computer, if that needs work I would suggest taking it to someone you trust in an auto repair shop.

Julian Vorgic
225

I second the blower motor resistor block, under the hood. The HI setting is the normal blower speed, so HI will always have juice. The resistor gives you MID and LO speeds. Its right behind the intake plenum, screwed on to the heater box. Its straight forward to replace but, its in a tight spot.

keither12
40

How do it look

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 2,519 nationwide Grand Marquis listings starting at $1,599.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,490
#2 kbro
kbro
Reputation 1,860
#3 FordNut
FordNut
Reputation 1,380
View All

Related Models For Sale

Used Ford Crown Victoria"
3 Great Deals out of 1,472 listings starting at $1,950
Used Lincoln Town Car"
49 Great Deals out of 2,204 listings starting at $1,875
Used Ford F-150"
2,452 Great Deals out of 200,276 listings starting at $1,500
Used Dodge Charger"
519 Great Deals out of 32,160 listings starting at $1,800
Used Ford Mustang"
615 Great Deals out of 45,260 listings starting at $1,550
Used Chevrolet Caprice"
174 listings starting at $1,915
Used Toyota Camry"
1,515 Great Deals out of 88,823 listings starting at $600
Used Honda Accord"
1,124 Great Deals out of 72,940 listings starting at $500
Used Ford Taurus"
316 Great Deals out of 18,705 listings starting at $1,499
Used Cadillac DeVille"
2,287 listings starting at $1,999

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
8 Great Deals out of 52 listings starting at $8,995
2010 Mercury Grand Marquis For Sale
10 Great Deals out of 128 listings starting at $5,495
2009 Mercury Grand Marquis For Sale
6 Great Deals out of 122 listings starting at $1,599
2008 Mercury Grand Marquis For Sale
11 Great Deals out of 200 listings starting at $2,995
2007 Mercury Grand Marquis For Sale
22 Great Deals out of 186 listings starting at $2,988