Question about Ford F-150

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I was under the truck the while the engine was running other day and noticed coolant dripping from the holes under the radiator. I checked the level of the coolant and it was normal. My display in the truck that tells me if my truck is hot or cold is not working either. I also checked the hoses and the cap from what I see no leak.

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If you have had rain recently it s amazing how much of the water gets in and hangs around until shaken free by the engine running. If the coolant level remains normal this would the cause. The temperature sender that is used to display readings on you dash board is separate to the coolant temperature sensor that sends signals to the engine control module. The sender usually has just one wire attachment and the sensor at least two. Remove the sender electrical connection and make sure both that the top of the sender and the corresponding electrical socket are free of dirt and corrosion. Use a emery paper to shine things up and maintain connection.

Posted on Oct 06, 2010

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My coolant level is dropping about two cup fulls every couple of months,there is no coolant on ground just a small water drip on garage floor after about middleways underneath engine after driving it.


There are only a few ways coolant can get out of the cooling system.
First check where the hoses connect to the radiator to make sure they are completely dry. Then check directly under radiator to make sure it isn't damp. Sometimes the radiator cap will go bad and allow some coolant to leave. You can replace the radiator cap relatively cheap. The very worst way you can be loosing coolant is thru a blown head gasket. The coolant slowly leaks into the cylinder and is burned. You would have to go to a mechanic to have this verified.

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Doesn't sound like it ran hot enough or long enough to crack or warp the head. If there is a crack, the engine will continue to overheat. If a warped head, car would probably run rough, the affected cylinders would likely have little or no compression, there would be a noticeable miss, and overheating would continue.
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A couple of tests may be called for. A pressure test of the coolant system will check if the system holds pressure as it should-about 15 psi. If pressure does not hold, there is a leak somewhere. Water pumps usually leak through the weep hole when they fail. A radiator leak would show up when pressure is applied. If pressure does hold, check if you have a good radiator cap-the cap is what seals the system so pressure will maintain. Coolant under pressure raises it's boiling point by about 10 degrees, so is critical to keep the system under pressure.
If you suspect further problems-losing coolant or continued overheating-then have the chemical test done to check for exhaust gasses in the coolant. Basically a check if the head gasket is good, a simple test done at the radiator cap opening with a special fluid that changes color if hydrocarbons are present in the cooling system.
Or you could have a compression test of the cylinders to check the internal mechanical condition-not only tells you if head gasket is good, also tells you a lot about engine condition-even,. balanced, good compression in all cylinders translates into good power output-rings are good, valves are sealing good, all systems go.
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