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Jumpy water temp guage

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Old Feb 22, 2008 | 11:29 AM
  #1  
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Jumpy water temp guage

I just replaced my thermostat this weekend. I didn't think it was bad, but replaced it anyway. To my surprise, it's running a little bit warmer. Now the needle gets up to the O in Normal, but the odd thing is that when idling at a light, the needle jumps pretty quickly between the N and R and back every 20 seconds or so. Do you think the new thermostat is just cycling? I also just replaced the radiator. I have an early 95, water pump inlet is cast as part of the pump, this was a new Standt 205 thermostat.
 
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Old Feb 22, 2008 | 11:50 AM
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might still have air in the system.
 
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Old Feb 22, 2008 | 12:29 PM
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x2 on air, I cant imagine it JUMPINg if it was anything other than air or loose wire on sending unit.
 
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Old Feb 22, 2008 | 04:52 PM
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Sounds like a loose wire on the sending unit
 
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Old Feb 22, 2008 | 04:53 PM
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Where is the sending unit for the water temp, by the way?
 
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Old Feb 22, 2008 | 05:06 PM
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Old Feb 22, 2008 | 05:50 PM
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Thanks, I'll check the sender connection. Entirely possible that it got bumped in the course of thermostat swap. I think the air should be out of it after 50 miles or so, but that could be too.
 
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Old Feb 22, 2008 | 05:57 PM
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We have a water temp light?
 
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Old Feb 22, 2008 | 06:10 PM
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Yeah I didn't know that Either lol
 
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Old Feb 22, 2008 | 06:11 PM
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I wonder what temp that it goes off at? I've had mine up to 230 before and now light..
 
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Old Feb 22, 2008 | 07:05 PM
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Not sure what it goes off at but it in the panel with the WTS and WIF lights. It just says "engine Temp". Bill, Rick and I were discussing this a while ago and I think we decided some trucks didn't have the light. Or was it the E's didn't have the light. I can't remember. Mine has a light and a gauge and an aftermarket gauge!
 
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Old Feb 22, 2008 | 11:11 PM
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hight temp water light goes off at 241deg
 
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Old Feb 23, 2008 | 01:15 AM
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And when it goes off you take notice. If I recall it says:
ENGINE HOT
I had mine go off when I blew a heater hose on route 66. It's very impressive.

Rog

 
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