Need a little

seddon · 04-20-2019, 02:50 PM

Not sure if I am posting in the right section. I just had headers and catback exhaust installed along with a tune. For some reason the coolant overtank will not go down. I know when the car is running the tank in filled and lower when car is off or cooled down. Pic was taken after the car cooled overnight. No over heating or anything. Any ideas, thanks in advance.

LT4Greg · 04-20-2019, 04:14 PM

Looks fine to me seddon! As long as coolant is in the bottom tank and you aren’t having any overheating issues, it should be good. Maybe some others will chime in but looks okay to me.

MR2620 · 04-21-2019, 04:42 AM

Mine has always looked the same. Top tank is full

Sent from my Pixel 2 XL using Tapatalk

breakskeet · 04-21-2019, 06:31 AM

Upper coolant tank should always be full. Lower tank level will fluctuate. From owners manual:

Fill the surge tank top chamber
with the proper mixture to the
bottom of the fill neck. The top
chamber needs to be
completely full. Fill the surge
tank bottom chamber through
the service port to
approximately half.

Yours looks perfect!

seddon · 04-22-2019, 03:51 PM

Quote:

Originally Posted by breakskeet

Upper coolant tank should always be full. Lower tank level will fluctuate. From owners manual:

Fill the surge tank top chamber
with the proper mixture to the
bottom of the fill neck. The top
chamber needs to be
completely full. Fill the surge
tank bottom chamber through
the service port to
approximately half.

Yours looks perfect!

Is it also suppose to be filled when car is hot

LT4Greg · 04-22-2019, 07:22 PM

Seddon, your Z is good to go. No worries!

breakskeet · 04-23-2019, 06:27 AM

Quote:

Originally Posted by seddon

Is it also suppose to be filled when car is hot

Yes.

Dysan911 · 04-23-2019, 06:52 AM

FWIW. I never knew what that lower tank was for and when I removed the coolant reservoir for a header install, I never filled the lower tank up at all. I did notice however that when my engine was warm from driving the coolant in the upper tank was completely full and when it cooled down the level would drop in the upper tank to about the fill line. I assumed this was normal operation until one day on here someone brought up a topic about the lower tank and how the manual states it should be half full. Ever since filling that half full my upper tank is always completely full no matter if the engine is hot, warm or cold overnight.

I suspect it's just an expansion tank and will draw in or push out fluid from the lower as needed to keep the top full 100% of the time.

Gunkk · 04-23-2019, 07:14 AM

Quote:

Originally Posted by Dysan911

FWIW. I never knew what that lower tank was for and when I removed the coolant reservoir for a header install, I never filled the lower tank up at all. I did notice however that when my engine was warm from driving the coolant in the upper tank was completely full and when it cooled down the level would drop in the upper tank to about the fill line. I assumed this was normal operation until one day on here someone brought up a topic about the lower tank and how the manual states it should be half full. Ever since filling that half full my upper tank is always completely full no matter if the engine is hot, warm or cold overnight.

I suspect it's just an expansion tank and will draw in or push out fluid from the lower as needed to keep the top full 100% of the time.

This is correct. The upper tank must always be full 100% of the time. The bottom tank is the one you add fluid to to keep it between the marks (~ 1/2 full) which of course are hard to see.

Great design from an engineering standpoint to ensure there's no air in the loop, but horrible from a owner/maintenance standpoint.

This manual page shows the purge procedure as well as a good graphic of what the two tanks should look like under normal conditions (hot or cold).

seddon · 04-24-2019, 05:55 AM

Thanks fellas sometimes i get paranoid, i guess its my ocd.

breakskeet · 04-24-2019, 11:03 AM

Never hurts to ask man.

LT4Greg · 04-24-2019, 01:02 PM

Glad we could help you seddon.

Alain · 04-24-2019, 03:33 PM

this is a great thread !!! never be afraid to ask questions man, it helps the rest of us who might have similar concerns.

By the way, I think all of us here suffer from OCD lolol.

04-20-2019, 02:50 PM	#1
seddon Drives: 2017 ZL1 Join Date: Dec 2009 Location: NYC Posts: 1,165	Need a little Not sure if I am posting in the right section. I just had headers and catback exhaust installed along with a tune. For some reason the coolant overtank will not go down. I know when the car is running the tank in filled and lower when car is off or cooled down. Pic was taken after the car cooled overnight. No over heating or anything. Any ideas, thanks in advance. Attached Images __________________ Elite Design Concepts NY5THGEN2017 ZL1 Garnet Red/M6/// IG @Crazl1

04-20-2019, 04:14 PM	#2
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Looks fine to me seddon! As long as coolant is in the bottom tank and you aren’t having any overheating issues, it should be good. Maybe some others will chime in but looks okay to me. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

04-22-2019, 07:22 PM	#6
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Seddon, your Z is good to go. No worries! __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

04-23-2019, 06:52 AM	#8
Dysan911 Drives: 2017 50th Anniversary 2SS Join Date: Sep 2016 Location: Jacksonville, FL Posts: 930	FWIW. I never knew what that lower tank was for and when I removed the coolant reservoir for a header install, I never filled the lower tank up at all. I did notice however that when my engine was warm from driving the coolant in the upper tank was completely full and when it cooled down the level would drop in the upper tank to about the fill line. I assumed this was normal operation until one day on here someone brought up a topic about the lower tank and how the manual states it should be half full. Ever since filling that half full my upper tank is always completely full no matter if the engine is hot, warm or cold overnight. I suspect it's just an expansion tank and will draw in or push out fluid from the lower as needed to keep the top full 100% of the time. __________________ Former Ride: 17 Camaro 2SS, M6 - Fifty \| Procharger P1SC \| 3.7 Pulley \| Stage 2 IC \| Race Bypass \| DSX FF Kit \| JRE Custom E85 Flex Fuel Tune \| LT4 Fuel System \| JMS Voltage Booster \| MSD Plug Wires \| American Racing 1-7/8's LT Headers Full System Catback \| Baro Breakout Harness \| LT4 Map Sensor \| Katech Ported TB \| MMS Oil Catch Can \| 160 Thermo \| Solo Performance J-Pipes

04-24-2019, 05:55 AM	#10
seddon Drives: 2017 ZL1 Join Date: Dec 2009 Location: NYC Posts: 1,165	Thanks fellas sometimes i get paranoid, i guess its my ocd. __________________ Elite Design Concepts NY5THGEN2017 ZL1 Garnet Red/M6/// IG @Crazl1

04-21-2019, 04:42 AM	#3
MR2620 Drives: 2017 ZL1 - Hyper Blue Join Date: Mar 2015 Location: US Posts: 71	Mine has always looked the same. Top tank is full Sent from my Pixel 2 XL using Tapatalk

04-21-2019, 06:31 AM	#4
breakskeet Kevin Drives: 2018 Callaway Camaro ZL1 1LE Join Date: Apr 2018 Location: Rattlesnake, FL Posts: 321	Upper coolant tank should always be full. Lower tank level will fluctuate. From owners manual: Fill the surge tank top chamber with the proper mixture to the bottom of the fill neck. The top chamber needs to be completely full. Fill the surge tank bottom chamber through the service port to approximately half. Yours looks perfect!

04-24-2019, 11:03 AM	#11
breakskeet Kevin Drives: 2018 Callaway Camaro ZL1 1LE Join Date: Apr 2018 Location: Rattlesnake, FL Posts: 321	Never hurts to ask man.

04-24-2019, 01:02 PM	#12
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Glad we could help you seddon. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

04-24-2019, 03:33 PM	#13
Alain Drives: 2016 Challenger Hellcat, 2018 ZL1LE Join Date: Dec 2009 Location: Northern NJ Posts: 3,003	this is a great thread !!! never be afraid to ask questions man, it helps the rest of us who might have similar concerns. By the way, I think all of us here suffer from OCD lolol. __________________ 2016 Challenger Hellcat /B5 blue/Sepia interior/Brass Monkey Wheels/ 2018 ZL1 1LE/Red hot 2019 Shellby GT 350R/ Oxford white/ Matte Black Stripes/ Carbon Fiber Dash/ Electronics Package #413

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