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re: cooling system, heater, thermostat problem...
a few days ago, I heard what sounds like "air" leaking out of a tire coming from the dash board area, behind the air/heater controls.
I noticed my coolant was low and did add some in but it needed only about 1/2 gallon of coolant and distilled water. Mind you, I have not drained and filled my system for 3+ years so I not think that is a large amount and I have not driven it as heavily over this time period as well.
When I opened up my hood, I could hear that "air-fizzing-sound" and seemed to be coming from the 2 smaller rubber hoses that come into the cabin bringing coolant to my heater core.
I went back to look at what I have done in regard to my cooling system and it has been about 4yrs since I changed the upper and lower radiator hoses with clamps, I also added in a Tymar by-pass coolant filter. At that time I redid the smaller rubber hoses when I installed the Tymar filter as well as to replace the thermostat (with a new stock one from Ford) and thermostat housing. I zipped-tied the smaller coolant hoses along with a bundle of electrical wiring to clean up the area and wonder if I should not have done that.
In addition to this "air sound" that I hear during the truck being on and then happening a short while after the truck is turned off. I also notice that it takes longer for my truck to warm up and before the needle would be right in the middle of the word "Normal," now it only gets to about the "N."
Could I have a thermostat that is not responding, staying open? Should I replace the thermostat (and housing)? What is the small sensor next to the thermostat housing?
The other thing is, I have not replaced the Tymar filter in over a year, I am not sure if that could be doing anything. I wonder if I should just take the Tymar by-pass coolant filter out and put everything back to stock?
How often do you change out your rubber hoses (large and small), thermostat (and housing)?
I am a little concerned about driving around but it has been running just fine and since topping off the degas bottle, I have not seen any leaks so I hope my gauge on the dash is correct in telling me that my system is running a little cool at the moment. But that "leaky air sound," is puzzling.
Look forward to any and all of your advice.
ps: my truck is a 1996 F250 that is mostly stock but has the Tymar Air Intake, down-pipe and exhaust, along with the Tymar by-pass coolant filter.