Need help troubleshooting Cooling problem

[Xdt]

Dynamite,
I will verify lines are not blocked and provide feedback on the exact temperature coolant spills over.

Once temp gage went over mid point and coolant spilled over I immediately turned off ignition. Never thought to check exact temperature.

[HAWAIIZR-1]

I'm not sure if I missed it looking at this on my phone, but did you "burp" your system as recommended by Marc Haibeck, the ZR-1 Specialist? It is fail proof and works every time. About over 10 years ago I had similar and it was air in my system.

http://www.zr1specialist.com/HAT%20W...%20Coolant.pdf




Sent from my iPhone using ZR-1 Net Registry

[GOLDCYLON]

Turn the AC on do the fans come on ?

[S.hafsmo]

Stock setup for a '90 is primary fan start @ 194°F, secondary fan start @ 230°F.
This acc. to LT5 fuel and emission course book.

[S.hafsmo]

Apologies if it's not relevant. Got a bit bored and was going through the book now anyway.

[mike100]

I suppose for a sanity check, take the old and new thermostats and throw them both in a pan of boiling water just to be sure they open at the same time.

[DRM500RUBYZR-1]

Puzzling.
IF....
You have been putting the radiator cap on FULLY, and it still pushes coolant to the overflow tank, that would indicate pressure beyond the caps rates 17 lbs, or a failed cap.

Where did your original tank fail?
and, was the failure caused by excessive pressure?

I would perform a pressure test in order to rule out or determine if something else might be going on.

Keep up posting your findings.



Marty

[Xdt]

Okay guys just thought I would provide an update. Before I get started,once again let me thank everyone for the assistance.

1) As suggested verified cap was fastened properly. Went all the way to last notch, no change, but good suggestion.
2) Once car cooled thought I would check New Delco cap 6410962 (Rock Auto)and with pressure tester. New cap would not make it to 17psi as stated on cap. Failed before 15psi
3) Went to Autozone and purchased Duralast 7716, and check with pressure gage. Cap held 16 plus psi.
4) Installed new Duralast cap and started car. Coolant pipes temp changed within 90 seconds but was warm within 150seconds.
5) As suggested verified temp with HVAC controller. Car achieved temp of 102C and fan kicked on as it should. Fan stop running when temp reached 98C. Note, in previous attempts by this time coolant was flowing past radiator cap and analog gauge was well past midpoint.
6) However, with the Duralast cap installed, I noticed coolant leaking around Brass filler neck and the seam of the tank.

In summary it appears my New cap faulty which masked a leak in the plastic tank. Will replace tank and go from there. After a year and 4 months, one day soon I will drive this car.��

[Dynomite]

Originally Posted by Xdt

Okay guys just thought I would provide an update. Before I get started,once again let me thank everyone for the assistance.

1) As suggested verified cap was fastened properly. Went all the way to last notch, no change, but good suggestion.
2) Once car cooled thought I would check New Delco cap 6410962 (Rock Auto)and with pressure tester. New cap would not make it to 17psi as stated on cap. Failed before 15psi
3) Went to Autozone and purchased Duralast 7716, and check with pressure gage. Cap held 16 plus psi.
4) Installed new Duralast cap and started car. Coolant pipes temp changed within 90 seconds but was warm within 150seconds.
5) As suggested verified temp with HVAC controller. Car achieved temp of 102C and fan kicked on as it should. Fan stop running when temp reached 98C. Note, in previous attempts by this time coolant was flowing past radiator cap and analog gauge was well past midpoint.
6) However, with the Duralast cap installed, I noticed coolant leaking around Brass filler neck and the seam of the tank.

In summary it appears my New cap faulty which masked a leak in the plastic tank. Will replace tank and go from there. After a year and 4 months, one day soon I will drive this car.��

I think you solved the immediate issue.......you can get those tanks new for less than $75 or used for as low as $30 on Ebay.

I am thinking the tanks for the ZR-1 are identical to the Standard Corvette Tanks .........maybe
I can tell you tomorrow if the tanks are identical if no one else jumps in as I just installed a new Ron Davis Radiator and 195 deg Thermostat in my 1990 (L98) today (will be topping off that coolant overflow tank in morning)

[GOLDCYLON]

Originally Posted by Dynomite

I think you solved the immediate issue.......you can get those tanks new for less than $75 or used for as low as $30 on Ebay.

I am thinking the tanks for the ZR-1 are identical to the Standard Corvette Tanks .........

They are identical