1990 GMC Suburban 1500 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 GMC Suburban 1500

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A coolant leak may develop form the Intake manifold gasket causing overheating complaints. The coolant leak may be internal allowing coolant to mix with the engine oil, this condition can result in internal engine damage. Be aware that this problem is often mistaken as a blown head gasket.

The distributors can go bad and set a trouble code; they should be replaced.Faulty glow plugs and incorrect wiring to the glow plugs have been known to cause "hard start" problems.

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THE RECLINER MECHANISM AND THE SEAT FRAME MAY HAVE FOAM AND/OR VINYL BETWEEN THEM, CREATING A "SOFT" JOINT. THIS "SOFT" JOINT RESULTS IN LOWER THAN SPECIFIED BOLT TORQUE WHICH LEADS TO JOINT LOOSENESS, CAUSING BOLT FATIGUE AND EVENTUAL BOLT FAILURE.UNANTICIPATED HEAT IN THE TRANSMISSION CAN FORCE THE TRANSMISSION FLUID OUT OF THE VENT TUBE.

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This workhorse Suburban was very rough around the edges. With less than 100,000 miles it blew a headgasket. We also had a tire blowout on I-5 that luckily didn't cause an accident. I never felt very comfortable driving the truck and it just required too much repair given how young it was.

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