re: Help with cooling problem - '96 F350
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Junior User
Joined: May 2005
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From: BC Interior
re: Help with cooling problem - '96 F350
A huge thank you to all that helped me identify the problem. The thermostat that a dealer installed up north was the wrong one. Finally got the right one in today and voila! everything seems to have settled down. No temp spikes, gave it a 100km run and all looks well. Just curious as to why there would have been so much air bubbles with the wrong thermostat. Pump cavitating from over pressure? Anyway, thanks again.
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
Glad you found the trouble....damn dealership.
I'm going to post a link to this thread in your original post.
Should help others with similar problems.
Quoted from dieselsite:
Here:
http://www.dieselsite.com/index.asp?...ROD&ProdID=186
WHY A LONG STEM AND NOT A SHORT STEM?
The thermostat in the Powerstroke not only controls operating temperatures, but properly directs the flow of coolant through the engine. As the thermostat opens, it proportionally closes the bypass. With the thermostat fully open, the bypass is mostly closed, and vice versa.
With the International (Pre-96 Ford) thermostat, this cannot be controlled properly because of the shorter bypass stem. The shorter stem of the IH(pre-96 Ford) thermostat allows the thermostat to be fully open while the bypass is fully open. This means the coolant can travel in any direction available -- whatever direction it chooses. It can either travel through the radiator or simply make the shorter, less restrictive path back through the front of the engine.
This will cause uncontrolled overheating in the back cylinders of the block, with absolutely no signs of danger showing on the water temperature gauge in the cab. It is possible that the back of the engine can have no coolant flow at all yet the thermometer in the outlet of the water pump shows all to be normal. Multiple things can happen at this point. Cylinders can seize, freeze plugs can fall out and other normal symptoms of an overheating engine may occur. Worst case is a blown motor and it won't be covered under warranty.
I'm going to post a link to this thread in your original post.
Should help others with similar problems.
Just curious as to why there would have been so much air bubbles with the wrong thermostat. Pump cavitating from over pressure?
Here:
http://www.dieselsite.com/index.asp?...ROD&ProdID=186
WHY A LONG STEM AND NOT A SHORT STEM?
The thermostat in the Powerstroke not only controls operating temperatures, but properly directs the flow of coolant through the engine. As the thermostat opens, it proportionally closes the bypass. With the thermostat fully open, the bypass is mostly closed, and vice versa.
With the International (Pre-96 Ford) thermostat, this cannot be controlled properly because of the shorter bypass stem. The shorter stem of the IH(pre-96 Ford) thermostat allows the thermostat to be fully open while the bypass is fully open. This means the coolant can travel in any direction available -- whatever direction it chooses. It can either travel through the radiator or simply make the shorter, less restrictive path back through the front of the engine.
This will cause uncontrolled overheating in the back cylinders of the block, with absolutely no signs of danger showing on the water temperature gauge in the cab. It is possible that the back of the engine can have no coolant flow at all yet the thermometer in the outlet of the water pump shows all to be normal. Multiple things can happen at this point. Cylinders can seize, freeze plugs can fall out and other normal symptoms of an overheating engine may occur. Worst case is a blown motor and it won't be covered under warranty.
Thread Starter
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Junior User
Joined: May 2005
Posts: 51
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From: BC Interior
Yeah, I read that too. My butt was doing some serious cringing, thinking about damage as yet unseen. The antifreeze was probably boiling back there. No wonder there was a huge amount of pressure in rad hoses before the thermostat opened up.
Really nice to hear a success story. You are defiantly the KING of replacing thermostats.
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