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Old 02-05-2011, 10:31 PM
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Default losing coolant.

My 04 5.7 is losing coolant. Ive noticed that the reservoir will go from the full mark to the low mark within a week or so. Also there are no visible leaks anywhere. Every now and then when driving I will get a very faint smell of engine coolant but it quickly disipates. The engine is not overheating and I am on the interstate 90 pct of the time. And, on a totally different question, when I check my power steering fluid the when the cap is removed it seems to be under pressure, is this normal? BTW, I changed the spark plugs today and cleaned the throttle body. Thanks to this forum and the "techs" that provide us with tips and instructions/advice, it wasn't bad at all!
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Old 02-05-2011, 10:41 PM
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You mite need a new rad cap
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Old 02-05-2011, 11:08 PM
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It could be a loose hose clamp , leaking radiator , radiator cap , heater core etc.....If you have the worm gear hose clamps , give them a tweaking . Look at the radiator closely . It could have a seam laeaking . Let us know what you find .
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Old 02-07-2011, 02:34 AM
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Default

If you smell it, either the fresh air intake for the cabin is picking it up from a leak (cap or hoses prime suspects) OR heater core/fittings loose or leaking. Given that kind of volume, you'd notice heater related stuff pretty quick I'd think. I don't if they're much in use any longer, but I used to test coolant systems with a hand pump that screwed onto the neck in place of the radiator cap. It would pretty quickly spot leaks that don't happen when it's cold, and it's not always practical to find when the motor is hot.
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