Hey All,
Over the winter I did a H/C/I project on my 82,000 mile stock block 92 5.0. The mods are listed in my sig.
When I first started the car it was overheating and continued to push the antifreeze back out of the cooling system.
I did everything.
Jack the left side of the car up when filling.
Replaced the t-stat and tested both t-stats in boiling water to confirm they are opening.
Removed the temp sensor to check for an air pocket.
Replaced the temp sensor.
The radiator is a large Granatelli Aluminum that is very clean inside and flowing very well.
The rad cap is confirmed 16 pounds.
The water pump is a Jegs high flow and is in very good shape.
The heater and bypass hoses are in great shape and hooked up properly.
The head gaskets are on properly and the tabs are sticking out of the front of the engine.
I did a compression test yesterday and the results were from 155 to 165.
Okay, back to the problem. It overheated about 6 times until I took it to the shop that worked my cylinder heads. They saw what it was doing and got an infrared thermometer out and just as they did that the t-stat finally decided to open. He took a reading on the water neck and it was right at 190. The t-stat is rated at 195.
He told me not to fill the rad all of the way up. He said that he had seen cars that don't like to have the rad filled all of the way up and to just watch it for a while.
At that point the overflow tank was filled but the rad was down so I went on down the road and everything was fine. Over the last couple of weeks the car has been fine. I have driven it all over the place with no problems but little by little the cooling system was pulling the antifreeze out of the overflow tank back into the cooling system.
I checked the level in the rad one day last week and the rad was filled and the overflow tank was down to the Full Cold mark. I thought to myself that the system had worked it's problems out and everything was fine.
Yesterday I was going for a short ride (5 miles to town and back) and it started overheating and blowing the antifreeze out again. That's when I saw another mechanic with 35 years of experience and he said it was the head gaskets and told me to check the compression. Like I said above the test came up from 155 to 165.
There is no antifreeze in the oil and no steam coming out of the exhaust.
I thought about removing the t-stat all together and see what it does. I know it will probably take a while to get warm but I have to do something here. I was also considering drilling a 1/4" hole in one of the t-stats and see what that does.
Any thoughts or suggestions?
Over the winter I did a H/C/I project on my 82,000 mile stock block 92 5.0. The mods are listed in my sig.
When I first started the car it was overheating and continued to push the antifreeze back out of the cooling system.
I did everything.
Jack the left side of the car up when filling.
Replaced the t-stat and tested both t-stats in boiling water to confirm they are opening.
Removed the temp sensor to check for an air pocket.
Replaced the temp sensor.
The radiator is a large Granatelli Aluminum that is very clean inside and flowing very well.
The rad cap is confirmed 16 pounds.
The water pump is a Jegs high flow and is in very good shape.
The heater and bypass hoses are in great shape and hooked up properly.
The head gaskets are on properly and the tabs are sticking out of the front of the engine.
I did a compression test yesterday and the results were from 155 to 165.
Okay, back to the problem. It overheated about 6 times until I took it to the shop that worked my cylinder heads. They saw what it was doing and got an infrared thermometer out and just as they did that the t-stat finally decided to open. He took a reading on the water neck and it was right at 190. The t-stat is rated at 195.
He told me not to fill the rad all of the way up. He said that he had seen cars that don't like to have the rad filled all of the way up and to just watch it for a while.
At that point the overflow tank was filled but the rad was down so I went on down the road and everything was fine. Over the last couple of weeks the car has been fine. I have driven it all over the place with no problems but little by little the cooling system was pulling the antifreeze out of the overflow tank back into the cooling system.
I checked the level in the rad one day last week and the rad was filled and the overflow tank was down to the Full Cold mark. I thought to myself that the system had worked it's problems out and everything was fine.
Yesterday I was going for a short ride (5 miles to town and back) and it started overheating and blowing the antifreeze out again. That's when I saw another mechanic with 35 years of experience and he said it was the head gaskets and told me to check the compression. Like I said above the test came up from 155 to 165.
There is no antifreeze in the oil and no steam coming out of the exhaust.
I thought about removing the t-stat all together and see what it does. I know it will probably take a while to get warm but I have to do something here. I was also considering drilling a 1/4" hole in one of the t-stats and see what that does.
Any thoughts or suggestions?
