My wife drives an 01 Focus wagon. The one and only time she had an issue with no heat, it was low on coolant. Yea I know, seems to simple. The reservoir on the passenger side has a couple of lines for hot full and cold full. I discovered the thermostat housing that bolts the engine was leaking when she would shut if off (sudden temp change and instant lack of flow). She never mentioned seeing water under it but I had in the past but just ignored it. Also there is a sensor that screws into the block that is the temp sensor, but I don't recall what all it controls. It's located behind the alternator which has to be removed to get to it. The alternator died and had to be replaced last year so I replaced that switch while it was out. Alt swap takes several hours, some bloody scrapes and a whole new list of words to complete. I found a lot of help from a group of Focus folks (they are more into hot rod stuff, but will help anyway) here:
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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