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I HAVE A 2007 CHEVY COBALT THE CHECK ENGINE LIGHT
I had this problem with a 2007 Chevy Cobalt. I changed the coolant sensor and even though the check engine light went out I still had a reading of "---" on the coolant gauge. The problem is most likely one of three things: a low coolant level, a bad coolant sensor, or the thermostat needs to be replaced. The only other possible thing it could be is a bad BCM (Body Control Module) which in that case you would most likely be having other weird problems.
The Thermostat and the sensor are both very easy to get to and replace. Take off the engine cover by removing the oil cap and they are both to the rear of the engine on the driver's side. They are right next to each other.
Hope this helps!
on Aug 28, 2018
I have a 2007 Chevy Colbalt LT. It seems like the
Were they pro level scan tools or cheap code readers? Cheap code readers can only read generic powertrain "P" codes P000X to P0800. You need a more expensive scan tool that's capable of reading "enhanced" or "manufacturer specific P1000 tp P3000 and B, C and U codes. However, if it says it can't communicate, that's an indication of a shorted module somewhere on the digital data bus
on Dec 27, 2017
The coolant temp will sometimes
if your temp gauge is going blank several things can cause this. one is a bad wiring connection on the sending unit itself. could be corrosion on the connectors. these types of sending units work like a thermistat they do go bad. but id be looking for a loose ground. since this circuit is grounded to the body you could ground the system by using a set of jumper cables. use one side to ground the battery to the body and the other side to ground the motor to the body and see if it still happens.
a large amount of electrical issues are created by faulty grounds. i usually start by disconnecting the harness from the sending unit and inspecting it,if its not damaged. i would then reground the systems
on Dec 21, 2016
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