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If the front and rear bulbs flash fast also, replace the hazard switch or you could live with it. As they are working. If one doesn't work, check grounds. I just run a new ground, much easier than cutting open the harness to find the break.
Please check if you have the correct part number bulbs? The front and rear bulbs are dual filiment, one for the signal and the other smaller one is a running light. If the bulb you have are correct, does your 4 way flasher function work and or left turn signal work? If the remaining rear flash ok, then your flasher unit is OK. You can also check the bulb running light by turning on the headlights. You might have a faulty or incorrect bulb if it does not light up.
I just recently had he same problem with mine. I replaced the front right turn signal bulb, but after a week of it working correctly, my wife complained that the turn signal did a double time fast flash. I found the rear bulb signal/ brake bulb was out as well. So I decided to purchase a dual pack bulb set and replace both the rear brake/signal bulbs (bulb number 4135) Your auto part store person can look up the correct number for the bulb brand you choose for the van. Since all the bulbs are about the same age and wear, I would recommend replaceing all of yours. Good luck.
Turn the engine off and open the hood. Pry up
the two fasteners from the radiator air baffle with a flat head
screwdriver. Move the baffle to the side to access the top of the
Pull up the two metal rods behind the headlight case. These
secure the case to the car. You may
need your pliers to pull them up.
Gently pull the headlight case out to access its rear. On the
rear, you will find several black dust covers. Twist off the dust cover
closest to the fender (the outward dust cover) to access the turn
Turn the bulb module counterclockwise to release it. Unplug
the electrical connector from the bulb module. Connect the new bulb to
the electrical connector (don't touch the glass with your hands; hold it
by the plastic piece). Insert the bulb module in the turn signal
housing, turn it clockwise and screw the dust cover back on.
Insert the headlight case in the mount. Push the pins back
down to secure it. Position the radiator baffle in its place and insert
Rear Turn Signal Bulbs
Open the trunk. Remove the net from the
side mounted wing nut (on the side with the faulty turn signal). Twist
the wing nuts (there are two per side) counterclockwise to remove them.
Peel the carpet layer back to access the rear signal lamp
wing nuts. Twist these wing nuts (two per side) counterclockwise to
remove them and release the rear signal.
Carefully pull the rear signal assembly away from the Impala.
The rear turn signal is the inner bulb (closest to the trunk). Press
the tab on the bulb module and turn it counterclockwise to release it
from the rear signal assembly.
Pull the old bulb straight off the module (don't twist).
Insert the new bulb in the module. Depress the tab on the connection and
insert the module back in the assembly. Twist it clockwise.
Insert the rear signal assembly. Re-attach the assembly's
wing nuts and push the carpet layer back in place. Tighten the other two
wing nuts to secure the carpet layer and reconnect the cargo net
remove the trim panel at the very rear of trunk, remove it and place it out of the way, remove tail light Assemblyretaining nuts top and bottom, I think there are 6 per side, pull the tail light assembly straight back to access the bulbs for replacement.