Need help troubleshooting Cooling problem

[Xdt]

Guys,
As stated in title I am having an issue with my cooling system. I recently did radiator replacement, due to a crack in the tank.

So I installed new GM radiator, Thermostat and gasket, new hoses and pressure cap.I bled the system using the method outlined in the solution post, which is to blow through the drivers side port to push coolant through water pump, to remove air from system.

I started car and once car got to temperature I noticed neither fan was running, coolant was overflowing through reservoir high fill, and temperature gauge was climbing past mid point. Immediately turned off ignition

***Below describes what I have tried thus far:***
1) New radiator cap, did not solve problems
2) Jumpered fans at obd1 port. Both fans ran as they should
3) Rented Motörad cooling tester. System held 17 psi for 2minutes (2 minutes was time stated in motorad maunal).

Please let me know what to try next....

Thank you

[Xdt]

Anyone?

[efnfast]

These engines can be a real bitch to get all the air out of. I ASSUME the rad cap was on tight? If it was and you were blowing out the over flow, there were some bad stant thermostats out there that would over pressurize the system and blow the radiator. I couldn't tell you how to identify the right thermostat.

[Xdt]

Efnfast
Thanks for the reply. Now that the system is filled with coolant how do you recommend I re bleed lthe system? Also would air in the line cause the fans not to run?

[efnfast]

I don't know how to confirm that the thermostat is correct. If it has to high a pressure spring, rumor has it it can pop the radiator and that would be bad.
If the water pump is circulating water, the air should work its way out.
The fans come on pretty high with a stock program. Is this a car you are familure with?
I should know this.. stock the primary fan comes on at 205? and the secondary comes on at 215? Maybe higher? I know on my 90 the temp gauge was way to the high side before the secondary came on, scary high.

[Xdt]

I purchased the thermostat from one of our supporting vendors. I will purchase another if needed.

So, if the coolant is over flowing through the pressure cap. I guess it's either thermostat or water pump?
Any ideas please keep them coming.

[RussMcB]

I wonder if there is a way to tell if the water pump is moving coolant. Perhaps there is air in the impellers.

[Xdt]

RussMcB,
I will drain some of the coolant and bleed system again. Any ideas of an alternate bleed method?

[Dynomite]

Originally Posted by Xdt

RussMcB,
I will drain some of the coolant and bleed system again. Any ideas of an alternate bleed method?

Are the two Injector Housing Coolant Manifolds getting warm within a minute? If so.....your coolant is flowing and the water pump is working.

And you do not have an Air Locked Water Pump. That is the only purpose of the methods you used is to insure you do not have an air locked water pump.

Now....if the Injector Housing Coolant Manifolds do not get warm.....your water pump is Air Locked or the Impeller is spinning on the shaft.

We are also assuming you installed the Thermostat correctly. We are also assuming it is a 180 deg Thermostat although any degree thermostat should allow the Injector Coolant Manifolds to get warm within a minute.

Am also assuming you did not remove the belt and install it incorrectly and coolant hoses are installed correctly.

Originally Posted by Xdt

coolant was overflowing through reservoir high fill, .
Thank you

What exactly does this mean???

Sounds like the water pump is working but the thermostat is installed incorrectly........but......an explanation is required.

[ssrszz4]

Upside down

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