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04-22-2013, 06:37 AM
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#1
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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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!
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04-22-2013, 10:21 AM
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#2
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,260
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I wonder if you have a clog somewhere. how did you do the flush? when exactly does it overheat?
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2000 Trans Am M6 - Mods: Yes.
2018 Durango R/T - AFE Intake, JLT Catch Can, Stainless Works Catback, Vinyl Dodge Racing Stripes
2003 Toyota Matrix XRS M6 - Lol
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04-22-2013, 11:59 AM
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#3
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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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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04-22-2013, 12:10 PM
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#4
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,260
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Yeah that would be my next step
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2000 Trans Am M6 - Mods: Yes.
2018 Durango R/T - AFE Intake, JLT Catch Can, Stainless Works Catback, Vinyl Dodge Racing Stripes
2003 Toyota Matrix XRS M6 - Lol
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04-22-2013, 03:58 PM
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#5
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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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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04-22-2013, 04:16 PM
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#6
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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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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04-22-2013, 08:45 PM
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#7
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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jim change the water pump
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04-23-2013, 03:18 PM
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#8
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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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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04-26-2013, 10:52 PM
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#9
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Join Date: Jul 2011
Location: harmony, nj (phillipsburg)
Posts: 516
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sounds like air trapped
__________________
1994 Firebird Formula - Injuneer's car - NEW PB 9.90 @131
2021 Charger Scat
Wrench/driver 94 Camaro Ellwein 385/D1SC/CPT 4l60e/9" slow pile
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04-28-2013, 09:49 AM
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#10
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Join Date: Sep 2006
Location: north jersey
Posts: 1,680
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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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