Harley Posted May 11, 2011 Share Posted May 11, 2011 The gauge climbs to the top of the blue mark then drops to the middle and repeats the cycle. Wondering what is the normal temp it should be running at?? I doubt its running that cold....Any theories??? The gauge is fine and the Temp sensor on the head is brand new. Link to comment Share on other sites More sharing options...
Geonovast Posted May 11, 2011 Share Posted May 11, 2011 Should stay right around 210. If you know the gauge and sender are fine, you thermostat could be either incorrect, or dying. Link to comment Share on other sites More sharing options...
Harley Posted May 11, 2011 Author Share Posted May 11, 2011 replaced the stat a couple mos ago with the standard replacement. forgot to mention that in the op Link to comment Share on other sites More sharing options...
mvusse Posted May 11, 2011 Share Posted May 11, 2011 The gauge climbs to the top of the blue mark then drops to the middle and repeats the cycle. Wondering what is the normal temp it should be running at?? I doubt its running that cold....Any theories??? The gauge is fine and the Temp sensor on the head is brand new. Don't know where the top of the blue mark is, but the temp going up and down is probably the thermostat opening and closing. Link to comment Share on other sites More sharing options...
airspeed Posted May 11, 2011 Share Posted May 11, 2011 Can you put a T-stat in backwards on a 2.5L? Would that cause it to cycle like that? Link to comment Share on other sites More sharing options...
shelbyluvv Posted May 11, 2011 Share Posted May 11, 2011 Can you put a T-stat in backwards on a 2.5L? Would that cause it to cycle like that? Air bubble in the head. Bleed the head like a RENIX 4.0 and see if that help you. Link to comment Share on other sites More sharing options...
beepbeepmyredjeep Posted May 11, 2011 Share Posted May 11, 2011 The gauge climbs to the top of the blue mark then drops to the middle and repeats the cycle. Wondering what is the normal temp it should be running at?? I doubt its running that cold....Any theories??? The gauge is fine and the Temp sensor on the head is brand new. Don't know where the top of the blue mark is, but the temp going up and down is probably the thermostat opening and closing. Agree with mvusse. I've seen this behavior with other vehicles when the thermostat is going bad. Normally this will also coincide with variations in the amount of heat the heater puts out...bursts of cold and warm. How is your radiator fluid level? Also, does it seem like the fluid is circulating through the system (i.e. are all of the radiator hoses hot to the touch after running a while)? Is it possible the new thermostat is defective? Thoughts? Link to comment Share on other sites More sharing options...
Harley Posted May 11, 2011 Author Share Posted May 11, 2011 The stat is new. heat output is consistent, fluid is full and all hoses are hot. Everything seems to be normal Link to comment Share on other sites More sharing options...
zagscrawler Posted May 12, 2011 Share Posted May 12, 2011 Sure sounds like an air pocket to me.... hmm next time you drive it and it is moving up and down like that try rapidly turning the steering wheel to slosh the water around in your cooling system, not while you hauling a$$ obviously. Some times the air pocket (if it has one) will move away from sender or thermostat and change your readings on your gauge. Or even consistant left or right hand turns can have the same effect. If you can manually change the readings on your gauge with any of the above mentioned techniques its got to be an air bubble traped in there. Good luck Link to comment Share on other sites More sharing options...
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