2004 impala ss coolant below threshold code

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MikeSniderhan
Posts: 6
Joined: Sat Nov 23, 2013 2:55 am

2004 impala ss coolant below threshold code

Unread post by MikeSniderhan » Sat Nov 23, 2013 3:02 am

hi, I'm having a code show up that coolants below threshold temp on a chevy impala ss indy edition. 3.8 series 2 supercharged. Could it be because its cold outside(17 deg. F.) and the s.c. forcing the cold air thru motor? or the temp. sensor? please note that when I checked the graph on the code reader it was spiking and dropping radically. While the temp. gauge appears to remain steady. Blows hot heat but sometimes takes quite a while to warm to operating temperature. Could it be thermostat AND sensor. 125,000 miles never been changed. :o :shock:

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TerryAuto
Posts: 313
Joined: Fri Dec 11, 2009 8:48 pm

Re: 2004 impala ss coolant below threshold code

Unread post by TerryAuto » Sat Nov 23, 2013 3:43 pm

The most likely cause for the P0128 on your Chevy is a bad thermostat. That is why the temperature is going up and down so much on your scanner. The gauge should move accordingly. 10-15 degrees might not show on the gauge. But, it is possible the temp sensor is bad as well. I would replace the thermostat, bleed, clear the code and re-check.

MikeSniderhan
Posts: 6
Joined: Sat Nov 23, 2013 2:55 am

Re: 2004 impala ss coolant below threshold code

Unread post by MikeSniderhan » Sat Nov 23, 2013 4:54 pm

Thanx, that's where Ill start then. ill update afterwards. Much appreciated.

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