coolant temp display and a/c
07-23-2011 | 02:10 AM
#51
Sorry Bika, I wasnt addressing your issue in particular at all. chances are that your thermostat is in actuality failing, its just not far enough out of spec yet to set the code and therefore trigger the other reactions.
07-23-2011 | 02:14 AM
#52
Again, what does just a low operating temp indicate? Maven, you're saying that my t-stat is not bad since its not blanking out the ect reading or throwing the cel? The car is showing no indication of anything being wrong other than the temp is 20 - 30 degrees colder than it used to be.
04-24-2015 | 11:04 AM
#54
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Joined: 04-24-15
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From: America
Problem Solved
As much as this doesn't make sense, this is what worked for me. I have a Cobalt Ls 2.2 liter and since about last December the digital read out would go in and out. One week I would have a temperature read out and the next it would say ---F and my check engine light would come on and the A/C would stop working. So, after reading through some trouble shooting I replaced the temp sensor. Not a hard fix and cost me about $25. This did not work.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
04-24-2015 | 11:05 AM
#55
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Joined: 04-24-15
Posts: 2
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From: America
Problem Solved!!
As much as this doesn't make sense, this is what worked for me. I have a Cobalt Ls 2.2 liter and since about last December the digital read out would go in and out. One week I would have a temperature read out and the next it would say ---F and my check engine light would come on and the A/C would stop working. So, after reading through some trouble shooting I replaced the temp sensor. Not a hard fix and cost me about $25. This did not work.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
Moderator
04-24-2015 | 10:03 PM
#57
As much as this doesn't make sense, this is what worked for me. I have a Cobalt Ls 2.2 liter and since about last December the digital read out would go in and out. One week I would have a temperature read out and the next it would say ---F and my check engine light would come on and the A/C would stop working. So, after reading through some trouble shooting I replaced the temp sensor. Not a hard fix and cost me about $25. This did not work.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
So I went back to the auto stir and bought a thermostat and coolant which cost me about $40 bucks. And bingo. That was it. I get it, it makes no sense.. But it worked. Engine light went off. A/C works fine. And I'm getting a read out every time. The cobalt lives to fight another day.
My solution was to disable the P0128 code. Replacing the thermostat also works.
08-05-2015 | 06:44 PM
#58
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Joined: 08-05-15
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From: Minnesota
I changed the coolant sensor and the t stat and sill temp is either not reading --- 'F or the temp is jumping around saying its overheating when it's not going from 90' to 240' back down and up
Last edited by Vallador; 08-05-2015 at 11:51 PM.
08-06-2015 | 09:31 PM
#63
Sure. If your scan tool reads good temps but the cluster doesn't then you know the cluster is bad. If the scan tool reads bad temps then you know it's not the cluster. I assume you're talking about the dash cluster?
08-06-2015 | 10:23 PM
#64
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From: Minnesota
09-09-2015 | 09:51 PM
#65
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From: Holden
09-09-2015 | 10:10 PM
#66
09-09-2015 | 10:33 PM
#67
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From: Holden
09-10-2015 | 02:07 AM
#68
This is false. My scan tool read temps fine and the dash still read ---*. Disabling the P0128 solved the problem but I realize not everyone can just tune their problems away.
08-03-2018 | 02:00 PM
#70
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Joined: 08-03-18
Posts: 1
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From: chattanooga, TN
A/c
Yes replace T-Stat, if you have access to a scan tool that can look at your ECT Sensor temp, be sure to verify it as working before you do so. Apparently part of the P0128 code is that it changes the tables on the car's ecu in which part of it disables reported coolant temp (the --- on the display) and turns off the air conditioning(body control module function) which is simply a direct result of lack of reported input (any temp not reported or below 32F). It appears this is a incorrect programming issue from GM and several other manufacturers who use the same series of ECU. On fords, reporting the P0128 it does NOT shut off the a/c nor does it zero out the reported temp. It also sets the SES light. I dealt with the exact problem twice this week on a 07 F150 and 06F150 respectively. Malaclypse, sorry man, just never assumed the ECU command to disable reporting.
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