No coolant flow LT1
#1
No coolant flow LT1
Hi.
My engine overheats and build pressure. I have this engine in a Hot Rod and i hope someone have a solution for me.
It seems like the water pump is not flowing. The pump is new, and the thermostat is new. I have bled the coolant system and I am pretty sure there are no airpockets anywhere.
I removed the front of the waterpump to check that it turns, and it does. I have removed one of the heater hoses to see if the water flows, but no flow. So I am really stuck here.
Oysteinbno
My engine overheats and build pressure. I have this engine in a Hot Rod and i hope someone have a solution for me.
It seems like the water pump is not flowing. The pump is new, and the thermostat is new. I have bled the coolant system and I am pretty sure there are no airpockets anywhere.
I removed the front of the waterpump to check that it turns, and it does. I have removed one of the heater hoses to see if the water flows, but no flow. So I am really stuck here.
Oysteinbno
#4
Re: No coolant flow LT1
Did you check the water pump driveshaft coupling?
http://shbox.com/ci/water_pump.jpg
Is the thermostat the correct one for an LT1 engine:
http://shbox.com/1/tstat.jpg
Thanks to Shoebox for the graphics.
http://shbox.com/ci/water_pump.jpg
Is the thermostat the correct one for an LT1 engine:
http://shbox.com/1/tstat.jpg
Thanks to Shoebox for the graphics.
#6
#7
Re: No coolant flow LT1
Did you check the water pump driveshaft coupling?
http://shbox.com/ci/water_pump.jpg
Is the thermostat the correct one for an LT1 engine:
http://shbox.com/1/tstat.jpg
Thanks to Shoebox for the graphics.
http://shbox.com/ci/water_pump.jpg
Is the thermostat the correct one for an LT1 engine:
http://shbox.com/1/tstat.jpg
Thanks to Shoebox for the graphics.
But still no flow when put together and filled up with water.
Also tried to disconnect a heater hose to see if I have flow there, but nothing..... It's a real mystery
#8
Re: No coolant flow LT1
Last edited by BIG SHAFE; 07-11-2018 at 07:48 AM.
#10
Re: No coolant flow LT1
The engine is from a 1995 Corvette, so it's a LT1.
The steam line is connected to the hose from the top of the waterpump up to the radiator. The lower heater outlet on the waterpump is connected to the line with the heater regulator an the top are connected to the return line from the heater.
I use a 3-row aluminum radiator that fits the body of the car (1936 chevrolet ). Inlet on top left, and outlet at the lower right.
I believe that it should be flowing trough the steam line all the time, but I have abolutely no flow. The heater hoses become hot, and from the waterpump to the radiator. The lower part of the radiator is cold. After a while the water starts boiling..
The steam line is connected to the hose from the top of the waterpump up to the radiator. The lower heater outlet on the waterpump is connected to the line with the heater regulator an the top are connected to the return line from the heater.
I use a 3-row aluminum radiator that fits the body of the car (1936 chevrolet ). Inlet on top left, and outlet at the lower right.
I believe that it should be flowing trough the steam line all the time, but I have abolutely no flow. The heater hoses become hot, and from the waterpump to the radiator. The lower part of the radiator is cold. After a while the water starts boiling..
#11
Re: No coolant flow LT1
The Corvette coolant system is significantly different than the F-Body (Camaro/Firebird), particularly with regard to bleeding the air out of the system. The Corvette system “self bleeds”, the F-Body system needs to be manually bled.
Here's the way a 95 F-Body (Camaro/Firebird) should be connected, with arrows showing flow directions. The flow from the back of the heads (steam pipe) should pass through the throttle body, then enter the liquid/vapor separator in the radiator. You appear to have it entering the pump suction (feed line) from the radiator to the water pump. Putting hot coolant and vapor bubbles into the pump suction may promote cavitation.
http://shbox.com/1/95-97_hoses.jpg
The Corvette water pump is also slightly different than the F-Body pump, mainly with regard to orientation of the connections. The functions are still the same.
http://shbox.com/1/lt1_water_pumps.jpg
Do you have a heater, utilizing the connections on the water pump? Do you have a flow restrictor in the supply line (part #13 in this diagram):
http://shbox.com/1/heater_hoses.jpg
Do you have an oil cooler?
Graphics courtesy of Shoebox.
Here's the way a 95 F-Body (Camaro/Firebird) should be connected, with arrows showing flow directions. The flow from the back of the heads (steam pipe) should pass through the throttle body, then enter the liquid/vapor separator in the radiator. You appear to have it entering the pump suction (feed line) from the radiator to the water pump. Putting hot coolant and vapor bubbles into the pump suction may promote cavitation.
http://shbox.com/1/95-97_hoses.jpg
The Corvette water pump is also slightly different than the F-Body pump, mainly with regard to orientation of the connections. The functions are still the same.
http://shbox.com/1/lt1_water_pumps.jpg
Do you have a heater, utilizing the connections on the water pump? Do you have a flow restrictor in the supply line (part #13 in this diagram):
http://shbox.com/1/heater_hoses.jpg
Do you have an oil cooler?
Graphics courtesy of Shoebox.
#12
Re: No coolant flow LT1
The Corvette coolant system is significantly different than the F-Body (Camaro/Firebird), particularly with regard to bleeding the air out of the system. The Corvette system “self bleeds”, the F-Body system needs to be manually bled.
Here's the way a 95 F-Body (Camaro/Firebird) should be connected, with arrows showing flow directions. The flow from the back of the heads (steam pipe) should pass through the throttle body, then enter the liquid/vapor separator in the radiator. You appear to have it entering the pump suction (feed line) from the radiator to the water pump. Putting hot coolant and vapor bubbles into the pump suction may promote cavitation.
http://shbox.com/1/95-97_hoses.jpg
The Corvette water pump is also slightly different than the F-Body pump, mainly with regard to orientation of the connections. The functions are still the same.
http://shbox.com/1/lt1_water_pumps.jpg
Do you have a heater, utilizing the connections on the water pump? Do you have a flow restrictor in the supply line (part #13 in this diagram):
http://shbox.com/1/heater_hoses.jpg
Do you have an oil cooler?
Graphics courtesy of Shoebox.
Here's the way a 95 F-Body (Camaro/Firebird) should be connected, with arrows showing flow directions. The flow from the back of the heads (steam pipe) should pass through the throttle body, then enter the liquid/vapor separator in the radiator. You appear to have it entering the pump suction (feed line) from the radiator to the water pump. Putting hot coolant and vapor bubbles into the pump suction may promote cavitation.
http://shbox.com/1/95-97_hoses.jpg
The Corvette water pump is also slightly different than the F-Body pump, mainly with regard to orientation of the connections. The functions are still the same.
http://shbox.com/1/lt1_water_pumps.jpg
Do you have a heater, utilizing the connections on the water pump? Do you have a flow restrictor in the supply line (part #13 in this diagram):
http://shbox.com/1/heater_hoses.jpg
Do you have an oil cooler?
Graphics courtesy of Shoebox.
The steam line is connected at the pump feed line, so that should be right.
I don't have a flow restrctor. This is only used to prevent to much cooling when cold outside. This is not a problem since I use the car in the summer.
No, I don't have an oil cooler.
#13
Re: No coolant flow LT1
Since you appear to totally reject my analysis, and feel you have a full understanding of the purpose of the flow restrictor, I'll drop out at this point.
Good luck.
Good luck.
#15
Re: No coolant flow LT1
https://www.camaroz28.com/forums/lt1...outing-881977/ Look at post 6 for the diagram and post 10 for the routing. If your filler neck is the highest point you should not have to bleed the system, just use a standard overflow tank.