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Chevy Silverado and GMC Sierra Radiator and Cooling Questions

52 messages,  Last post on Nov 22, 2009 at 1:51 PM

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#1 of 52 Temperature fluctuating by bbydolly13 Dec 06, 2006 (1:58 pm)
Can anyone tell me why the temperature gauge in my 94 GMC Sierra pickup would shoot way up to the red for a few seconds then go back down really low? I have already had my radiator flushed and filled and thermostat replaced and it had not helped. It doesn't seem to matter if the engine is cold or hot when this happens. Also, since this problem has started my heater doesn't work as well either. Replies to this message: bhixson (Dec 08, 2006 7:53 am) vaward (Dec 08, 2006 3:48 pm) bhixson (Oct 26, 2007 9:58 am)
#2 of 52 Re: Temperature fluctuating [bbydolly13] by bhixson Dec 08, 2006 (7:53 am)
Replying to: bbydolly13 (Dec 06, 2006 1:58 pm) Hi, I have the same problem with my 94 Suburban. I have also flushed everything out and replaced the water pump, thermostat, and even the radiator cap. Most mechanics I talk to susspect that there is not enough coolant flow through the engine but nobody can figure out how to fix it.
#3 of 52 Re: Temperature fluctuating [bbydolly13] by vaward Dec 08, 2006 (3:48 pm)
Replying to: bbydolly13 (Dec 06, 2006 1:58 pm) My 94 silverado did the same thing with a message of "check gauges" on the dash. I kinda figured with 215K on it the tmp sensor was going bad, so I unplugged it, checked the voltage to it and got a reading from the sensor. plugged it back up and have had no other occurance for about a month now. wiring connection maybe?? the sensor is cheap and easy to replace. i had no trouble codes in the OBD before testing the sensor and had 1 "low coolant temp" afterwards.
#4 of 52 2006 Silverado waterpump-radiator hose connection leak by ricsch Mar 25, 2007 (2:19 pm)
#5 of 52 2006 Silverado waterpump-radiator hose connection leak by ricsch Mar 25, 2007 (2:19 pm)
I have a 2006 Silverado with a 5.3 and at 800 miles, the water pump had to be replaced because coolant was seaping from where the metal tube is inserted into the top of the water pump for attaching the upper radiator hose.   Well, after 2,000 miles, it is leaking once again!!   If I recall when looking at the new-style '07 Silverado, I believe they did away with the poor design. Wondering if it the new designed water pump will work on my truck.   Sure don't feel like making a it a habit to have this repaired/replaced at the dealer, especially after the warranty is done!   Anyone else experience the coolant leak as I described? What was done to correct it?   Thanks
#6 of 52 1989 C2500 5.7 Water Pump Rotation by 1989c2500 Dec 31, 2006 (7:51 am)
#7 of 52 1989 C2500 5.7 Water Pump Rotation by 1989c2500 Dec 31, 2006 (7:51 am)
Can anyone tell me the proper rotation of the water pump. I replaced the water pump and the thermostat with a failsafe and the temperature worked fine for about a week. Now it stay cool I know the water pump comes in two styles a clockwise and counter clockwise rotation. I purchased the clockwise rotation, I believe this is wrong. Can anyone help me.
#8 of 52 1998 Z71 Temperature Problem???Help?? by fastballbaker Jan 10, 2007 (8:11 pm)
#9 of 52 1998 Z71 Temperature Problem???Help?? by fastballbaker Jan 10, 2007 (8:11 pm)
I have a 1998 Chevy Z71 and I am having an odd problem with the temperature. I need help if anyone can figure this one out. I start and run my truck just as normal, but when the temperature gauge reaches 190 degrees the problem occurs. At 190 degrees the gauge will drop all the way back down to 100 or below, and also at this time the anti-freeze in the radiator will bubble up or overflow and run out into the reservoir tank. The temperature gauge will never rest or stay at one temperature. It will always rise up and then overflow anti-freeze into the reservoir tank and then cool down. Why is my truck not holding a steddy temperature? Why the overflow? Can anyone help with this? I have replaced the thermostat and that did not work. I have replaced the radiator cap and that did not work. I have checked pressure in all 8 cylinder and they read.. 125, 110, 110, 100, 100, 100, 90 and 90.Does any of this help. Thanks for your help..
#10 of 52 2003 Chevrolet Silverado 5.3 Z71 Losing coolant by arkz71 Feb 20, 2007 (5:51 pm)

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