Question about 1989 GMC Sierra

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1989 gmc truck runs hot - 1989 GMC Sierra

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Thermostat sticking, waterpump going bad, leak in cooling system/low on coolant, or headgasket going bad.

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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SOURCE: 1989 gmc sierra 6.2 liter diesel hard start when hot

hi, i have seen this problem ten years ago twice, but i was dumbfounded by the answer. all details aside, I replaced the ecm, and never had the problem again with both of them. this repair was a recommended repair by the local truck depot in my town, they stated the ecm got hot along with the truck and it lost the injector sensor signal. now, don't take this solution and run with it, i haven't repaired a 6.2 diesel in ten years and i maybe off track completely. but at least maybe you could ask around your town or maybe a large truck facility about this. of course, you should take to a shop to have diagnosed. hope i could help.

Posted on Jun 07, 2010

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SOURCE: 1989 GMC Sierra truck doors loose

Hey there.You can purchase a door pin and bushing repair kit to tighten up the hinge area,requires removing the door to replace.If the hinge area is worn to badly,the brass bushings willnot last.Also your window crank handle is held on by a C-clip behind the handle in between the plastic shim and the handle which requires a special tool to remove or a small screwdriver to get the clip off.It is hard to see.The shaft that the handle is on are known to wear also and if thats the case you will need to have the window regulator replaced.Hope this helps.John.

Posted on Mar 10, 2009

  • 312 Answers

SOURCE: both wires to brake light switch are hot until

you'll have to find the wire that is hot when the brake pedal is pressed. hook the red wire from the module to this, the black wire will go to battery hot, the white will go to ground and the blue wire will go to the trailer connector for the rear electric brakes.

Posted on Mar 17, 2011

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1500 2000 sierra 4 by 4 will run rough in hot weather


I had a same problem on a Chevy. and it turned out to be vacuum I had to rebuilt the heads. As I drove it would run rough, as soon as I would check it out I would not find any vacuum.

Sep 07, 2013 | 1989 GMC K1500

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1989 GMC running hot have replaced radiator, thermostat,water pump,Temp sensor, intake taken off ports cleaned out. No air pockets, what am I missing


I had a 1987 oldmobile that had that problem. It turned out that the fan clutch thermostat had gone bad and would not engage when the engine heated up. The fan clutch was part of the fan. I replaced it and solved the problem.

Sep 24, 2011 | 1989 GMC C1500

1 Answer

My 1989 GMC Sierra (350, 2WD) was leaking from the water pump and overheating...Installed new water pump and serpentine belt (after getting it off, it needed to be replaced)...Truck is still overheating,...


when replacing coolant, did you bleed the air from system! you can remove radiator or overflow cap when cold. start vehicle and let it run until thermostat opens,when all air is out hoses should get hot. but before starting, turn heater on to high setting, if you vehicle does not have a air bleeder on it. do as above. just be sure radiator is full of coolant. after hoses get hot, turn off heater, then put cap back on radiator or overflow. good-day! the first thing to do is to check for a stuck closed thermostat. do this first ok!


Jul 27, 2011 | 1989 GMC Sierra

1 Answer

Both wires to brake light switch are hot until brakes are pressed then one looses power. 1989 gmc truck need to wire powerstop trailor brake module. any suggestions


you'll have to find the wire that is hot when the brake pedal is pressed. hook the red wire from the module to this, the black wire will go to battery hot, the white will go to ground and the blue wire will go to the trailer connector for the rear electric brakes.

Mar 17, 2011 | 1989 GMC C1500

1 Answer

1989 gmc sierra 6.2 liter diesel hard start when hot


hi, i have seen this problem ten years ago twice, but i was dumbfounded by the answer. all details aside, I replaced the ecm, and never had the problem again with both of them. this repair was a recommended repair by the local truck depot in my town, they stated the ecm got hot along with the truck and it lost the injector sensor signal. now, don't take this solution and run with it, i haven't repaired a 6.2 diesel in ten years and i maybe off track completely. but at least maybe you could ask around your town or maybe a large truck facility about this. of course, you should take to a shop to have diagnosed. hope i could help.

Jun 07, 2010 | 1989 GMC Sierra

2 Answers

1989 GMC sierra c1500 largest tire size?


any tire dealer can provide this info.

Apr 29, 2009 | 1989 GMC Sierra

1 Answer

89 gmc can't start when hot


Check your engine codes for anything , you can get free info on the web or get a repair manual. it can be one or more problems until you narrow it down.

Apr 26, 2009 | 1989 GMC C1500

1 Answer

1989 6.2 diesel running too rich


It could also be the timing on the fuel pump. I have one myself

Mar 20, 2009 | 1989 GMC C2500

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