Most Common G-Body Problems

GP403

GP403

Administrator
Site Admin
Moderator
Feb 25, 2005
3,412
113
Inola, OK
.....and solutions: Go!



Not talking about "just LS swap it" or "put new wheels on" but rather things that commonly go wrong or break or fail on these cars, and the fixes. Specific things are better.
 
superbon54

superbon54

Greasemonkey
Apr 15, 2014
195
63
Disintegrating interior plastics.
Rotting passenger floor from heater box leaks.
Slow/inoperable power windows and locks.
Rotted door bottom lips.
Rotted quarter panel bottoms.
Rotted body mounts.
Vinyl top rust.
Cracked “wood” on the steering wheel insert.
Chalky bumper and gas door fillers.

Solution to these = LS it!!!
 
gnvair

gnvair

Master Mechanic
Sep 1, 2018
323
43
Southern New Jersey near Philly
Loose/rattling door glass on coupes.
Cracking of the door jambs around the door lock strikers
Loose tilt steering columns (this could be any GM car of that time period)
Loss of high speed hvac blower motor
Worn door hinge pin bushings on coupes
Cracking at the top of the B pillars on Regals, Grand Prix, Monte Carlo and Cutlass coupe models.
 
8

81cutlass

Royal Smart Person
Feb 16, 2009
1,865
113
Western MN
Dash squeeking? Lubricate center hood bumper on cowl.

HVAC won't adjust temperature? The blend door in the heater box often breaks. Sometimes a screw or bolt is all that's needed to repair it. Remove glove box door and its on the top.

Hood stuck when you pull the latch release cable? Grease latch mechanism.

High speed on HVAC fan doesn't work? Fusible link often bad, high fan speed doesn't go through the resistor box like the lower speeds do.

Doors close like junk? Adjust window stops or door hinges. If you can pick the end of a door up and down the pins are shot and it's time for a bushing kit!
 
CaliWagon83

CaliWagon83

Royal Smart Person
Supporting Member
Nov 12, 2017
1,850
113
Orange County, CA
Generally speaking, I'd agree with crusty plastics and hoses. But of course, some of that comes with these cars being 30+ years old. Even mine, which has lived in a garage most of its life, has fallen prey to the ravages of time.
 
B

bracketchev1221

Master Mechanic
Jan 18, 2018
454
63
Mine was door hinges, heater control vacuum switch, broken console door. basically just replace them all.
 
bob64

bob64

G-Body Guru
Mar 30, 2017
716
93
Niagara Falls, Canada
Instrument cluster connections fail, pull apart and clean it up and pray.

Rusted body and frame mounts, cut out and replace.

Waves in the plastic filler panel, rear bumper Cutlass. Replace or live with it.

Lack of power, fix, more engine, turbo, blower or nitrous
 
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