75 F-250 Overheating
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75 F-250 Overheating
Hi,
This is my first post. I own a 75 F-250 4x4 with a 360 in it. I have very recently replaced the radiator because the old one was coming apart. When I installed it and got everything ready, the engine overheated. I thought maybe the thermostat was stuck, I took it out and tested it. It was fine. The truck doesn't overheat at idle, but I only have to go about 2 miles in it and it overheats.
The top hose is very swollen and under pressure at this time. My only guess is that the water pump isn't working. I can't tell, it isn't making any noise. The last time a water pump went out on me in my mustang, I could easily tell. Which direction does the water flow through the radiator? Does it go from top out the bottom hose? I am not sure. Everything has been checked and replaced except the pump.
Anyone here know what it could be?
This is my first post. I own a 75 F-250 4x4 with a 360 in it. I have very recently replaced the radiator because the old one was coming apart. When I installed it and got everything ready, the engine overheated. I thought maybe the thermostat was stuck, I took it out and tested it. It was fine. The truck doesn't overheat at idle, but I only have to go about 2 miles in it and it overheats.
The top hose is very swollen and under pressure at this time. My only guess is that the water pump isn't working. I can't tell, it isn't making any noise. The last time a water pump went out on me in my mustang, I could easily tell. Which direction does the water flow through the radiator? Does it go from top out the bottom hose? I am not sure. Everything has been checked and replaced except the pump.
Anyone here know what it could be?
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Sometimes this happens when you replace rads.
You need to burp the air out of the system.
Run it up to operating temp with the rad cap off and let the water burp out and keep filling it back up.
Once it stops burping,drain some of the water out then add the necessary coolant.
You need to burp the air out of the system.
Run it up to operating temp with the rad cap off and let the water burp out and keep filling it back up.
Once it stops burping,drain some of the water out then add the necessary coolant.
Fleet Owner
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From: Lake Tahoe, Nevada
Originally Posted by Ivorytooth
Hi,
The top hose is very swollen and under pressure at this time. My only guess is that the water pump isn't working. I can't tell, it isn't making any noise. The last time a water pump went out on me in my mustang, I could easily tell. Which direction does the water flow through the radiator? Does it go from top out the bottom hose? I am not sure. Everything has been checked and replaced except the pump.
Anyone here know what it could be?
The top hose is very swollen and under pressure at this time. My only guess is that the water pump isn't working. I can't tell, it isn't making any noise. The last time a water pump went out on me in my mustang, I could easily tell. Which direction does the water flow through the radiator? Does it go from top out the bottom hose? I am not sure. Everything has been checked and replaced except the pump.
Anyone here know what it could be?
The coolant is drawn into the water pump from the bottom of the radiator (after it is cooled,) pumped through the block and heads then out through the upper hose to the radiator again.
If you find there is no air in the system, it may be that your lower hose collapses when you are driving, restricting the flow. The pump intake creates a negative pressure. (It sucks.)
Replace both radiator hoses.
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Originally Posted by Bdox
If the top hose is "very swollen" it may be weak due to age.
The coolant is drawn into the water pump from the bottom of the radiator (after it is cooled,) pumped through the block and heads then out through the upper hose to the radiator again.
If you find there is no air in the system, it may be that your lower hose collapses when you are driving, restricting the flow. The pump intake creates a negative pressure. (It sucks.)
Replace both radiator hoses.
The coolant is drawn into the water pump from the bottom of the radiator (after it is cooled,) pumped through the block and heads then out through the upper hose to the radiator again.
If you find there is no air in the system, it may be that your lower hose collapses when you are driving, restricting the flow. The pump intake creates a negative pressure. (It sucks.)
Replace both radiator hoses.
Thanks for telling me the flow. I wondered about that. Never thought of it unitl now. That makes alot of sense and is a good thing to troubleshoot. Thanks!!
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From: Brentwood,CA
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I did do those things. 
The new stat didn't work too well, but the old one did so I put it back in and yes, the correct way. I am not the most gung ho mechanic, but I have done some. 
I will burp it today and let you know if that worked.
The new stat didn't work too well, but the old one did so I put it back in and yes, the correct way. I am not the most gung ho mechanic, but I have done some. I will burp it today and let you know if that worked.
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From: Springfield, OR
On some of the lower hoses they will have a coiled spring inside. This prevents them from sucking shut and blocking the coolant flow. In the past I have reused the spring in a new hose if it didnt come with one.
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Just to let you all know, the burping was the solution. Of course by the time I went to burp it, most of the air was gone because of the overheating episodes and me bleeding off the air from the cap.
Thanks again!! I didn't realise that much air would get trapped in a new radiator.
Thanks again!! I didn't realise that much air would get trapped in a new radiator.
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