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Old 07-23-2016, 08:26 PM
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Thermostat gauge bounces all over the place

As it says the thermostat gauge bounces all over the place both when firing it up and while it is running. It has a little bit of smoke coming out of the breather filter (if that's what that is) on the top of the engine. What does that indicate?

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Old 07-23-2016, 11:54 PM   #2
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{ It has a little bit of smoke coming out of the breather filter (if that's what that is) on the top of the engine. What does that indicate? }

I think that would be a bad PCV valve and the hoses going to it and the one at the other end of the cover may need cleaned or replaced.

Now on the gauge, what did you find when you looked at the sending unit, was it covered with oil, dry but lose wires or what does all this look like, and a lot of the time the gauge cluster needs to be cleaned as like mine does right now.

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Old 07-24-2016, 09:32 AM
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So I am a total noob when it comes to this stuff. So when you say sending unit does it have to do with the coolant temp sensor? Should I follow the wires to that or from the gauge or are they connected all together?
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Old 08-03-2016, 09:06 PM   #4
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could have air in it maybe needs bleed
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Old 08-03-2016, 09:41 PM   #5
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So I am a total noob when it comes to this stuff. So when you say sending unit does it have to do with the coolant temp sensor? Should I follow the wires to that or from the gauge or are they connected all together?
Two sensors. One on thermostat housing, two wires. That has nothing to do with the gauge, it's for the computer. On the back of the engine near the valve cover where the intake/exhaust manifolds mount, there is a single wire sensor. It is a resistor that gives X amount of resistance in ohms between that wire and ground for the temp gauge to read. Clean it off with degreaser or Purple Power/Super Clean if you have it, or at least brake cleaner.

Back probe the wire and measure resistance to ground with an ohm meter. If you don't have one, you should. I like the Southwire digital clamp meters at Lowe's. Do it either completely cold (assume it's at the room temperature outside) or at operating temp (assume it's at 210*F). Open up my 1995 manual in my signature. 90 Instrument Panels very last page with content on it should have the resistance values.
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