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#1049113 - 03/21/17 03:52 AM Ls swap 5.3 overheating issue  
Joined: Apr 2016
Posts: 234
1988SilverBulletMCSS Offline
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1988SilverBulletMCSS  Offline
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Joined: Apr 2016
Posts: 234
Daytona Beach, FL
Ok I just finish install my 5.3 in my Gbody and it's overheating. I tried bleeding the system but it didn't work. I hear a clunking sound from the top radiator hose after I whole of it not cooling down. Also the lower rad hose doesn't get hot nor warm. Only the top rad hose get really hot.
A little inside of my set up F body radiator with fans. Heater hose bypass. I also replaced the thermostat today.
Please can anyone share some light on what I can do?

#1049117 - 03/21/17 10:52 AM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
Joined: Feb 2002
Posts: 4,215
Jameson Offline
15+ Year
Jameson  Offline
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Joined: Feb 2002
Posts: 4,215
Elizabeth City, NC
How did you try bleeding the system and how do you have the steam ports routed back to the radiator as well as the coolant tank plumbed in?


1988 Monte Carlo SS Eaton 112 5.3/T56 swap, Way to many mods to list.
2015 GMC Sierra Denali



#1049120 - 03/21/17 12:33 PM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
Joined: Apr 2016
Posts: 234
1988SilverBulletMCSS Offline
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1988SilverBulletMCSS  Offline
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Joined: Apr 2016
Posts: 234
Daytona Beach, FL
I tried bleeding it by filling the radiator than staring the car and squeezing the upper rad hose then when it went down I refilled. I used the stock steam port to bottom port under the coolant tank port near the rad cap. And the coolant tank to the top port near the cap

#1049129 - 03/21/17 08:27 PM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
Joined: Dec 2003
Posts: 1,574
spacemanspif Offline
15+ Year
spacemanspif  Offline
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Joined: Dec 2003
Posts: 1,574
Sewell, NJ
Pull the top hose off the radiator and fill the block through the hose. Filling the radiator will not fill the block very well. If the top hose is getting hot and the bottom is cold, you might have a clogged radiator. Did you get a new rad for the project? New but used? Old one that's been in there for 30 years? Just in case, make sure your water pump is spinning the opposite direction of the crank pulley. What did you do with the heater hoses?


-Mike

F-body bucket seats, camaro console, carb'd 5.3/4L80E swap

Fastest time to date: 13.390 @ 102.42
Best r/t: 0.007 I got lucky smile

Killed a few cones too

#1049131 - 03/21/17 09:53 PM Re: Ls swap 5.3 overheating issue [Re: spacemanspif]  
Joined: Apr 2016
Posts: 234
1988SilverBulletMCSS Offline
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1988SilverBulletMCSS  Offline
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Joined: Apr 2016
Posts: 234
Daytona Beach, FL
I have the heater ports bypass. But I fixed my issue thanks anyway to you all. My only other problem is p0171 keeps popping up and I experience power lost on acceleration

#1049151 - 03/22/17 06:56 PM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
Joined: Apr 2011
Posts: 1,183
Hunter79764 Offline
10+ Year
Hunter79764  Offline
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Joined: Apr 2011
Posts: 1,183
Grand Prairie, Tx
https://www.autocodes.com/p0171_chevrolet.html P0171 CHEVROLET - Fuel Trim System Lean Bank 1 to save everyone having to look it up.

How long did the engine sit before installation? Sometimes the fuel injectors can close over with varnish. Clean them up with some seafoam, maybe cycle them individually with a 9V battery (check youtube or LS1Tech for instructions). There might be a restriction in the fuel rail as well. Also check all grounds for injectors on bank 1. If you are getting loss of power, that makes me think it is an actual condition, not just a faulty O2 sensor (unless it is going pig rich and you are seeing black smoke from the tailpipe). You can work on nailing it down by swapping components from side to side and see if you get P0174 (bank 2 lean). And seeing that you aren't getting P0174 for bank 2, makes me thing it isn't a low fuel pressure issue etc.

What fixed the overheat? I know I had issues until I filled from the top hose like Mike suggested, no real problems since but I did drill a small hole in the thermostat as well.

Last edited by Hunter79764; 03/22/17 06:57 PM.

Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1049163 - 03/22/17 10:27 PM Re: Ls swap 5.3 overheating issue [Re: Hunter79764]  
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1988SilverBulletMCSS Offline
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1988SilverBulletMCSS  Offline
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Joined: Apr 2016
Posts: 234
Daytona Beach, FL
Ok I will check the fuel pressure when I get a chance. Also I filled the water pump from the top hose. But I may have to get a new water pump because I seen it leaking today and it wasn't from any of the outlets or inlets seem like the water pump was cracked

#1049176 - 03/23/17 06:55 PM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
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upflying Offline
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upflying  Offline
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Reno, NV
Mine runs 206 degrees, what does your temp read when plug in a scanner on the OBDII port?


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1049180 - 03/23/17 08:29 PM Re: Ls swap 5.3 overheating issue [Re: 1988SilverBulletMCSS]  
Joined: Apr 2011
Posts: 1,183
Hunter79764 Offline
10+ Year
Hunter79764  Offline
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Posts: 1,183
Grand Prairie, Tx
Just a note on my experience, I put an aftermarket lower temp thermostat in originally because I didn't want to risk overheating while I was working a bunch of other kinks out. I had an idiot light at ~211° (fan 2 setpoint) but that was about it, ran it hard a few times and triggered the light. Later on when it was more sorted out, I had my OBDII on there and watched the temperature swing from 170-190° quite a few times, even at idle and/or cruise. I swapped it out for the old stock thermostat that probably had 150k miles on it and right away, I could see a thermostat quality difference. Once it gets to operating temp (197° on that one, I believe) it doesn't vary by more than 2° unless I'm beating on it hard. Even then, it rarely gets to the Fan 1 setpoint (I think it's 206°?) and I don't think I've seen it hit 210° since. Full disclosure, I only drive it about 2000-3000 miles a year and I don't have AC, so my experience is far from definitive. But if anyone has an aftermarket T-stat and you have temperature issues, you might consider sticking a stock unit back in...


Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway

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