Overheating issue
I have a 1990 gmc sierra with a 5.7 tbi and a 5 speed. A few days ago while going to pick up my gun it started overheating.
I changed the thermostat and nothing No leaking out of my pump I flushed the system I changed the coolant cap I Noticed that when I give it throttle the upper hose flexes like it is compressing. My cat isn't clogged It will normally climb to temp but then it will slowly go to around 230-245 than instantly drop 35-40 degrees in a few seconds. I'm going to purchase a digital thermometer to see what temp it reads. Thanks guys! |
I wonder if you have a clog somewhere. how did you do the flush? when exactly does it overheat?
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I put a t fitting in the heatercore line and ran water through it. It seems to heat up after I drive for a couple of miles but it doesn't shoot right up. I'm going to see if i have a clog in the radiator after work.
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Yeah that would be my next step
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jim did you change the fan clutch my blazer did the same thing till i changed the fan clutch
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No not yet, ibelieve it's fine. Update. Drive home from work and it stays normal temp. I even sat there with the a/c on for 10 min and it didn't go above 200. Very strange, maybe a clog that cleared in the radiator. I cleaned it out yesterday and have not driven it much.
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jim change the water pump
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I see it circulating water when the cap is off. I'm going to check to see if my radiator is clogged first before I buy anything.
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sounds like air trapped
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Put a new radiator in and it fixed the issue. When I was taking the old one out I had both hoses off and I heard a small whistle sound in the upper hose. When it made that sound the radiator finished draining. Definitely clogged up in there!
Thanks guys for the tips |
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