Replace the Lumbar Support Hose on a GMC Typhoon

The 1992 GMC Typhoon came equipped with a set of cloth/leather embroidered seats (loved by some, hated by many) that just so happened to have a manual lumbar support bladder that you pumped up with a hand bulb and and deflated with a 1 way valve. While not the most advanced system, it does get the job done on long distance drives by adding a bit of comfort to one's lower back. The 91 GMC Syclone shares the same lumbar system. This article can be a guide for fixing a Syclone's lumbar system, however some steps may differ slightly.

Required Tools

Required Parts

Silicone Hose

Symptoms

Time has been the sole enemy of the lumbar support in the 92 Typhoon seats. The hose that goes from the bulb to the bladder becomes dry and cracks or completely breaks off.

Step by Step Instructions

Removing the seat

1

This job will require you to remove the seats from the truck. The seats are bolted down to the cab via a track system. There are 4 bolts to remove in each corner of the track.

Passenger Seat Hose Replacement

2

You will need to separate the bottom of the seat from the back. Using a torx 50 and 1/2" remove the 2 torx screws on either side of the seats.

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3

When you turn the back section of the seat over, there is a clip that runs down the entire length of the seat. Remove the clip to open the bottom side.

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4

With the clip off, you can now pull open the seat and expose the bladder valve with hose connection.

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5

Remove the old hose. Insert the new hose onto the bladder valve and begin to route it as it was originally sitting in the seat.

6

To get the new silicone line through the seat, you will need to turn the seat bottom over and unbolt 1 of the rails as well as undo the clips that hold the fabric to the frame of the seat.

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7

After you get this side rail off, you will need to undo this staple. You will need a 1/2" socket to get the rail off. BE CAREFUL! make sure not to hit the lever that makes the seat slide. You WILL hurt your hand because it will fly back at you!