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post #1 of 11 (permalink) Old 09-23-2011, 05:09 PM Thread Starter
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coolant temperature sensor

what are the symptoms of a faulty coolant sensor????
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post #2 of 11 (permalink) Old 09-23-2011, 07:01 PM
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Assuming you're talking about the engine temp. sensor (and not the ambient temp. or intake temp. sensor):
Temp. gage reads other than what you know the engine temperature to be. Also, since the fans work off that same sensor, you may get overheating (due to the fans not working) - but your gage won't be indicating overheating even though the engine is actually overheating since the same sensor output is used to drive the gage and the fans. That's if the sensor output says it's cold when the engine is actually hot. If the opposite is true, then gage would read high when the engine is not hot, and the fans would run a lot or all the time.


'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs

Last edited by peva; 09-23-2011 at 07:07 PM.
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post #3 of 11 (permalink) Old 09-23-2011, 07:46 PM
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He probably referring to a P0128 code. I've kicked one on and off a couple of times. If your motor is cool and hasn't had time to warm up and you flog it, then this could trip the DTC
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post #4 of 11 (permalink) Old 09-24-2011, 03:25 AM Thread Starter
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yes i am talking about the engine coolant sensor... any more symptoms ???? most of the time fans are running fast??? could this be related but i dont have any codes????
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post #5 of 11 (permalink) Old 09-24-2011, 03:40 AM
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So why don't you tell us what led you to suspect a coolant sensor problem. Did you get any codes? Something else going on? Just trying to provide the best possible advice here.
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post #6 of 11 (permalink) Old 09-24-2011, 04:53 AM Thread Starter
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no codes but most of the time fans ran real fast.... some 1 told me other symptoms are
gas millage .. black smoke hard start ect
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post #7 of 11 (permalink) Old 09-24-2011, 07:11 AM
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Well with your fans, Id check the relay. If your running warm, bleed the cooling system. As for the gas mileage and black smoke, I've never heard of those symptoms. If you are overheating and you blew a headgasket A. You wouldn't go too far. B. You'd be blowing white smoke.
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post #8 of 11 (permalink) Old 09-24-2011, 07:56 AM
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When the fans are on hi speed, what is the reading on your temp. gage? Read my previous post.
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post #9 of 11 (permalink) Old 09-24-2011, 03:51 PM Thread Starter
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Quote:
Originally Posted by peva View Post
When the fans are on hi speed, what is the reading on your temp. gage? Read my previous post.
normal temp.. just behind the middle line .....


ok my other question do i need to flush the cooling system? one of the mechanics from payne dodge dealer told me just to wait for the engine to be cold .. n just remove n replace the coolant sensor.. is he right or not ?
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post #10 of 11 (permalink) Old 09-24-2011, 04:03 PM Thread Starter
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i got this comment from dodge forums........

coolant temperature sensor adjust the air to fuel ratio depeneding on the temperature of your engine. If it is bad it will run your too rich(to much gas, not enough air) and it will run rought at idle and definatly have black smoke, it will make your engine stall, as described in your case. In some cases you can unplug the sensor and the PCM will compensate by running a default air/fuel ratio and in some cases allowing the car to run without the sensor, I'd just replace it.
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post #11 of 11 (permalink) Old 09-24-2011, 05:38 PM
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yeah, but if its bad your gauge would read something other than normal too. is the fan speed the only symptom you have?
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