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Old 12-27-2005, 08:22 PM   #1 (permalink)
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Default Error code 0128

I have got this error code: 0128 .. which is for: "Thermostat Rationality"..

What the heck is that suppossed to mean?

We took a new (srt4-oem) thermostat and drilled a few 3/16" holes in it, so it would act(aproximately) like a 185 thermostat.
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Old 12-27-2005, 10:19 PM   #2 (permalink)
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you answered you own question.
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Old 12-27-2005, 11:19 PM   #3 (permalink)
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Quote: Originally Posted by westup
you answered you own question.

Are you referring to the drilling of the holes in the thermostat?

If so, does that imply that anyone using a 185 or say a 165 thermostat, gets this code?
Or is it because of the drilled holes, that the thermostat does not work properly?

Or are you just being facetious?
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Old 12-28-2005, 11:24 PM   #4 (permalink)
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:BUMP


well did u ever figure it out....?
bc i was thinkin about doing that same thing


i dont know if u remember me... but im the guy that u and your wife asked to ride in your car that day when u went get it allined...(sp) we u went pick it up from st motorsports....
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Old 12-29-2005, 12:19 AM   #5 (permalink)
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leave the tstat stock.its best that way..search.
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Old 12-29-2005, 12:59 AM   #6 (permalink)
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Did a quick check in the factory service manual and couldn't find that specific code. My guess is that the holes you drilled are causing it to not open up properly and the PCM is detecting this via the coolant temp sensor. Adding a few holes that big will not cause it to act like a 180/160 thermostat, but it can interfere with proper operation.

On my older Chrysler 16V 2.2L Turbo III engines I would drill one small hole, but that was just to maintain a little steadier temperature rise. Since those heads had a tendency to crack, thermal shocking didn't go together very well with a $4k+ bare casting. The small hole also allowed any air still trapped after bleeding to pass. This isn't a big problem on the SRT-4, so one small hole might be fine, but I'd just run a real 180° thermostat if that's what you're trying to simulate.
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Old 12-29-2005, 01:09 AM   #7 (permalink)
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u fd up ur plan.. get a another stocker and try agane
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Old 12-29-2005, 05:47 PM   #8 (permalink)
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Oh Pop... are you ever gonna learn? Hope y'all had a Merry Christmas. I just may pop in this weekend. What are you guys up to?
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Old 12-29-2005, 06:37 PM   #9 (permalink)
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Quote: Originally Posted by blackbird_R/T
Did a quick check in the factory service manual and couldn't find that specific code. My guess is that the holes you drilled are causing it to not open up properly and the PCM is detecting this via the coolant temp sensor. Adding a few holes that big will not cause it to act like a 180/160 thermostat, but it can interfere with proper operation.

On my older Chrysler 16V 2.2L Turbo III engines I would drill one small hole, but that was just to maintain a little steadier temperature rise. Since those heads had a tendency to crack, thermal shocking didn't go together very well with a $4k+ bare casting. The small hole also allowed any air still trapped after bleeding to pass. This isn't a big problem on the SRT-4, so one small hole might be fine, but I'd just run a real 180° thermostat if that's what you're trying to simulate.

OK, that's it.. you've convinced me to put the stock 195 back in with no holes drilled.

Thank-you very much.

(Hearing from Eric is like hearing from the master )

Mike
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