6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nodnarb76 · 06-09-2016, 11:47 AM

Still fixing all the little problems after doing my 6.0/4L80 Swap into my 87 Suburban. Along with the motor installed an Enytropy radiator/fan kit.
Fans come on low speed then high speed like they are supposed to.
When I'm driving and have airflow through the radiator, everything is fine, once I come up to a light or stop, temp goes up about 20-30 degrees, even if the fan is on high speed, then goes back down when I start moving. When I installed the motor I replaced the water pump and thermostat with new AC Declo parts.
Any ideas?

solidaxel · 06-09-2016, 11:53 AM

Sounds like air trapped in your system do not for get to turn the heater on to circulate the water through the heater core

Nodnarb76 · 06-09-2016, 12:30 PM

Quote:

Originally Posted by solidaxel

Sounds like air trapped in your system do not for get to turn the heater on to circulate the water through the heater core

That is what I was thinking also, going to pull a vacuum on it this afternoon at work and see if it helps.
Thanks for confirming what I was thinking.

solidaxel · 06-09-2016, 12:33 PM

Did you fill the engine from the top radiator hose dis connected from the rad?

Nodnarb76 · 06-09-2016, 01:21 PM

Quote:

Originally Posted by solidaxel

Did you fill the engine from the top radiator hose dis connected from the rad?

I did, I filled through the upper radiator hose until I had coolant coming out of the steam hose, re-connected everything. Because my filler neck is at an angle I even jacked up the pass side of the truck to try and get the filler neck level so it would hold more coolant when I filled the radiator.

TooTall · 06-09-2016, 01:48 PM

are you sure that the fans are blowing in the right direction?

Nodnarb76 · 06-09-2016, 01:52 PM

Quote:

Originally Posted by TooTall

are you sure that the fans are blowing in the right direction?

Pretty sure they are, they would only plug up one way, when the fans are on high speed, I can put a rag in front of the grille and it will pull it toward the grille.

Nodnarb76 · 06-10-2016, 09:01 AM

update: when driving to work today started getting hot when driving on interstate too. then when came to a stop still getting hot. Fans are coming on, no leaks anywhere, when I pulled over overflow tank was bubbling.
Is it possible a new AC delco thermostat is sticking?

LS short box · 06-10-2016, 03:22 PM

If you think there is still trapped air in the system try loosening the temp sensor till you get some coolant to run out. Careful of the hot coolant.

TooTall · 06-10-2016, 05:58 PM

Quote:

Originally Posted by Nodnarb76

update: when driving to work today started getting hot when driving on interstate too. then when came to a stop still getting hot. Fans are coming on, no leaks anywhere, when I pulled over overflow tank was bubbling.
Is it possible a new AC delco thermostat is sticking?

I would crack the steam hose after it's been up to temp

it almost sounds like you have a leak in the system and it's not pressurizing up, or your coolant mixture is off

zach_carver · 06-10-2016, 09:55 PM

How hot is it getting? My LS2 runs 210ish on the highway on a good hot day. Sitting still in traffic 212-215ish.

tony2tall · 06-19-2016, 08:52 PM

Just used that spill free funnel thing for burping my system today. Works great. Might be worth a try.

1moretoy · 06-21-2016, 10:05 AM

Quote:

Originally Posted by Nodnarb76

update: when driving to work today started getting hot when driving on interstate too. then when came to a stop still getting hot. Fans are coming on, no leaks anywhere, when I pulled over overflow tank was bubbling.
Is it possible a new AC delco thermostat is sticking?

Just replaced my water pump and installed a new 160* thermostat from summit. Engine was doing the same thing you are describing at idle though. Fans working and water everywhere, no air in the system. Ended up the thermostat was stuck closed replaced with a factory one from parts store and works perfect now.

Nodnarb76 · 06-21-2016, 10:32 AM

Quote:

Originally Posted by 1moretoy

Just replaced my water pump and installed a new 160* thermostat from summit. Engine was doing the same thing you are describing at idle though. Fans working and water everywhere, no air in the system. Ended up the thermostat was stuck closed replaced with a factory one from parts store and works perfect now.

That is what I ended up doing too. Swapped for a new thermostat and I have no more problems either.

06-09-2016, 11:47 AM	#1
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. Still fixing all the little problems after doing my 6.0/4L80 Swap into my 87 Suburban. Along with the motor installed an Enytropy radiator/fan kit. Fans come on low speed then high speed like they are supposed to. When I'm driving and have airflow through the radiator, everything is fine, once I come up to a light or stop, temp goes up about 20-30 degrees, even if the fan is on high speed, then goes back down when I start moving. When I installed the motor I replaced the water pump and thermostat with new AC Declo parts. Any ideas? __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824

06-09-2016, 11:53 AM	#2
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. Sounds like air trapped in your system do not for get to turn the heater on to circulate the water through the heater core __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

06-09-2016, 12:33 PM	#4
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. Did you fill the engine from the top radiator hose dis connected from the rad? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

06-09-2016, 01:48 PM	#6
TooTall Registered User Join Date: Mar 2009 Location: League City,TX Posts: 66	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. are you sure that the fans are blowing in the right direction? __________________ 1973 K5, full vert, 6" BDS lift, 35 Mickey T MTs 1984 K10, 8" lift on 35s 2004 3/4 4wd, 33s Toyo Mts, Long Tube headers, 3K multidisk 80e, tons of miles 2011 Yukon XL \| Bone stock 2013 Audi Q5

06-10-2016, 09:01 AM	#8
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. update: when driving to work today started getting hot when driving on interstate too. then when came to a stop still getting hot. Fans are coming on, no leaks anywhere, when I pulled over overflow tank was bubbling. Is it possible a new AC delco thermostat is sticking? __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824

06-10-2016, 03:22 PM	#9
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,132	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. If you think there is still trapped air in the system try loosening the temp sensor till you get some coolant to run out. Careful of the hot coolant.

06-10-2016, 09:55 PM	#11
zach_carver Registered User Join Date: Aug 2014 Location: Blue Ridge,GA Posts: 508	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. How hot is it getting? My LS2 runs 210ish on the highway on a good hot day. Sitting still in traffic 212-215ish. __________________ 1965 C10 LS2/4l70, WHITE, 5/7 DROP LINK TO SUPER SNOOPY C10 BUILD---> http://67-72chevytrucks.com/vboard/s...d.php?t=689283 1977 C10 SILVERADO HAWAIIAN BLUE, 5/5" DROP, LS6/4L80E 1976 CHEVY K5, 350/350, YUBA GOLD/SADDLE

06-19-2016, 08:52 PM	#12
tony2tall Registered User Join Date: Aug 2014 Location: Milwaukee WI Posts: 83	Re: 6.0 Swap w/new Enytropy Radiator/Fans running hot when not moving. Just used that spill free funnel thing for burping my system today. Works great. Might be worth a try.

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