Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Hot after H/C install

Thread Tools
 
Search this Thread
 
Old Jun 27, 2008 | 09:17 AM
  #1  
SOMbitch's Avatar
Thread Starter
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2007
Posts: 6,881
Likes: 3
Default Hot after H/C install

After the H/C install my car will get 230* with the A/C running on a hot day These readings are from a scan tool not the guage so I know it"s accurate. Not losing any water so I think head gaskets are ok. On a cooler day in the 70's the temp stays fine and never gets over 205* but these 90* plus days have me reluctant to drive the car Thermostat opens. Before the H/C it used to cool right down when the fans came on now it keeps getting hotter with both running. I think I'll get the radiator flow tested when I get back in town next week. Any other Ideas. I have had it suggested it is the extra timing in the tune but I doubt it could cause it to this extreme
Reply
Old Jun 27, 2008 | 09:36 AM
  #2  
dab2pds's Avatar
Staging Lane
 
Joined: Mar 2007
Posts: 72
Likes: 0
From: gpt,ms
Default

mine gets to 230+ if iidle too long in one place with the ac on these hot gulf coast days. i have a4 and stall to cool too tho. more reasonable temps and i get the same as you do, 205ish
Dave
Reply
Old Jun 27, 2008 | 09:56 AM
  #3  
SOMbitch's Avatar
Thread Starter
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2007
Posts: 6,881
Likes: 3
Default

Originally Posted by dab2pds
mine gets to 230+ if iidle too long in one place with the ac on these hot gulf coast days. i have a4 and stall to cool too tho. more reasonable temps and i get the same as you do, 205ish
Dave

Thanks! Makes me feel a little better The tuner says not to worry about it but I am sometimes stuck in my old school Gen I ways

Anybody else??
Reply
Old Jun 27, 2008 | 10:06 AM
  #4  
bczee's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (12)
 
Joined: Jan 2006
Posts: 6,670
Likes: 6
From: Concord, CA
Default

Added advance and lean conditions can cause your engine to run a bit hotter. Maybe take out some advance ? What do the plugs and tail pipes look like ?

What temp T-stat are you running ?.. is it a high flow one ? Set the Fans to come on at a lower temp ? Maybe try flushing the system and using some water wetter on the refill and purge air pockets out? Add a external Trans cooler. Make sure your front air dams and spoiler are in good shape to keep air flow into the radiator.
Reply
Old Jun 27, 2008 | 11:31 AM
  #5  
SOMbitch's Avatar
Thread Starter
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2007
Posts: 6,881
Likes: 3
Default

Originally Posted by bczee
Added advance and lean conditions can cause your engine to run a bit hotter. Maybe take out some advance ? What do the plugs and tail pipes look like ?

What temp T-stat are you running ?.. is it a high flow one ? Set the Fans to come on at a lower temp ? Maybe try flushing the system and using some water wetter on the refill and purge air pockets out? Add a external Trans cooler. Make sure your front air dams and spoiler are in good shape to keep air flow into the radiator.
Thanks Man

195* T-Stat OEM Goodwrench
Fans come on at 185*
30,000lb. Hayden cooler
Air dam intact
new dex cool


I am starting to suspect flow issues as the coolant in Rad and recovery tank doesn't seem hot.
Any other H/C cars do this other than me and dab2pds
Reply
Old Jun 27, 2008 | 01:24 PM
  #6  
bczee's Avatar
TECH Senior Member
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (12)
 
Joined: Jan 2006
Posts: 6,670
Likes: 6
From: Concord, CA
Default

How about trying a 180* Stat.. with your fans coming on at 185* and the 195*.. You might be able to keep it a little bit cooler. Seem that the Fans would never turn off if it can not cool down to under the 195* Stat...
Reply
Old Jun 27, 2008 | 03:39 PM
  #7  
Chevy-art's Avatar
On The Tree
iTrader: (4)
 
Joined: Mar 2007
Posts: 105
Likes: 1
From: San Antonio, TX
Default

Originally Posted by SOMbitch
After the H/C install
What is H/C? Thanks Art...
Reply
Old Jun 27, 2008 | 03:43 PM
  #8  
BIG_MIKE2005's Avatar
12 Second Club
20 Year Member
iTrader: (116)
 
Joined: Jun 2005
Posts: 5,221
Likes: 1
From: Skiatook, OK
Default

^^ Heads/Cam install.

Mine did the same & it turned out to be the water pump. It started weeping out about a day after the swap. I threw on a new water pump, upper/lower radiator hoses & thermostat & have been golden every since.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Jun 28, 2008 | 03:26 AM
  #9  
dab2pds's Avatar
Staging Lane
 
Joined: Mar 2007
Posts: 72
Likes: 0
From: gpt,ms
Default

Originally Posted by BIG_MIKE2005
^^ Heads/Cam install.

Mine did the same & it turned out to be the water pump. It started weeping out about a day after the swap. I threw on a new water pump, upper/lower radiator hoses & thermostat & have been golden every since.
I have a meziere pump, new 160 thermostat, fans turned on low, and only running 26 degrees of timing(more at idle of course, but i'd have to check my hp files). as soon as i turn the ac off and/or get moving the indicated temps go down, it's just hot as **** down here in ms by the gulf
Dave
Reply
Old Jun 28, 2008 | 06:21 AM
  #10  
StevieZ's Avatar
11 Second Club
iTrader: (3)
 
Joined: Mar 2002
Posts: 1,794
Likes: 1
From: Montreal
Default

Check for air in the coolant system
Reply
Old Jun 28, 2008 | 08:42 AM
  #11  
slt200mph's Avatar
TECH Senior Member
20 Year Member
iTrader: (42)
 
Joined: Jul 2003
Posts: 7,067
Likes: 9
From: HOT'LANA, GAWJA
Default

If you pull the hose from the head to the throttle body off or the throttle body by pass if you have done that mod and add coolant or water till it comes out of the head that is the highest point and all of the air should purge when filling up to that level... you may have a little air in your system..good luck with it...

Last edited by slt200mph; Jun 28, 2008 at 09:59 AM.
Reply
Old Jun 28, 2008 | 09:28 AM
  #12  
chrs1313's Avatar
10 Second Club
20 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (24)
 
Joined: Feb 2005
Posts: 5,703
Likes: 13
Default

i would bet you have some air in there...plus why not get a 160 stat...
Reply
Old Jun 28, 2008 | 09:46 AM
  #13  
DaveX's Avatar
TECH Fanatic
 
Joined: Feb 2004
Posts: 1,259
Likes: 0
From: Lexington, KY
Default

I also think it's most likely air in the system. There is a procedure to purge it. Mine never gets over about 195, even when sitting in traffic at 95 degrees outside and running the air.
Reply
Old Jun 28, 2008 | 11:40 AM
  #14  
eamador11's Avatar
TECH Resident
 
Joined: Jul 2005
Posts: 907
Likes: 1
From: NJ
Default

Originally Posted by SOMbitch
Thanks Man

195* T-Stat OEM Goodwrench
Fans come on at 185*
30,000lb. Hayden cooler
Air dam intact
new dex cool


I am starting to suspect flow issues as the coolant in Rad and recovery tank doesn't seem hot.
Any other H/C cars do this other than me and dab2pds
You dont have flow issues, drop in a 160 stat then have the fans reprogrammed for that rating. youll see 180 temps when cruising, 205 if your stuck in traffic on a hot day

Thats what ECS did on my H/C and its been like that for 4 years with no issues.
Reply
Old Jun 28, 2008 | 12:47 PM
  #15  
Grimes's Avatar
TECH Addict
iTrader: (3)
 
Joined: Mar 2003
Posts: 2,636
Likes: 2
From: Northern NJ
Default

+3 on air in the system. Let the car cool down and take the rad cap off. Start her up, and rev the engine up and down to kick the bubbles out. Keep the coolant level to the top of the radiator neck as you rev, so no more air gets in the system.

I've done this when draining the radiator on my car three times, an on a h/c install once - works like a charm.
Reply




All times are GMT -5. The time now is 02:26 AM.

story-0
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-1
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-2
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-3
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-4
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-5
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-6
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-7
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE