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1994 4.9 I6, temp. sender or T-stat

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Old 05-27-2012, 09:00 PM   #1
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Default 1994 4.9 I6, temp. sender or T-stat

The temp gauge in the cab reads almost nothing, but does seem to move a litte. Do you think the Tstat is just sticking open, or the sender is going bad?
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Old 05-28-2012, 12:27 AM   #2
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The temp gauge in the cab reads almost nothing, but does seem to move a litte. Do you think the Tstat is just sticking open, or the sender is going bad?
If your fuel mileage has been terrible lately then I would say the T-stat could be open, does it ever get to normal temp or just stay low?

If mileage is the same then I would suspect a bad sending unit. Mine will stay on the cool side for a while, then jump to normal temp then slowly back down again to cold.
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Old 05-28-2012, 12:37 AM   #3
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I would lean more towards the sender is going bad, there is a chance of a stuck open thermostat but you would still have some kind of temp increase. I have seen a combination of both though
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Old 05-28-2012, 03:04 PM   #4
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i had this problem in my 92...turns out i didn't have a t stat...i put one in there and it did the job...might want to replace it and see..
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Old 05-28-2012, 03:40 PM   #5
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T-stats are a wear item and should be replaced at regular intervals anyway, so id start there and if it doesnt fix the issue, oh well. Only a few bucks.
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