Chevy HHR Family
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Post by Bad Company on Mon Dec 24, 2012 7:39 pm

If you haven't done a t-stat replacement the first thing you will notice is there is no more flat round 2 hole gasket. There are 2 O rings, one on the inner metal disc that opens and closes to regulate the water tempature and a larger one around the outer t-stat itself. The inner one is usually the culprit, pulling away from the metal disc leaving a gap that you can barely get a pencil point into. That's all it takes to throw the P0128 code. Some brands of replacement t-stats do not have the inner ring.

When you get code P0128 (Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature). Replacing the thermostat is the usual repair for this code.

2007 Chevrolet HHR | HHR (VIN A) Service Manual | Document ID: 1833247

Engine Coolant Thermostat Replacement:
Removal Procedure

Drain the cooling system.
Reposition the radiator outlet hose clamp at the thermostat housing.
Remove the radiator outlet hose from the thermostat housing.

Remove the thermostat housing cover bolts and cover.
Remove the thermostat.
Remove and discard the thermostat housing O-ring seal.
Installation Procedure

Install a NEW thermostat housing cover O-ring seal.
Install the thermostat.

Install the thermostat housing cover bolts.
Tighten the bolts to 10 N·m (89 lb in).

Install the radiator outlet hose to the thermostat housing.
Position the radiator outlet hose clamp at the thermostat housing.
Fill the cooling system.


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Bad Company

Posts: 1442
Join date: 2012-11-02
Additional HHR Info: 2006 LT 206,000 miles and counting / 2009 2LT 82,000 miles

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Post by HHR Nole on Tue Dec 25, 2012 4:30 pm

Had to replace mine a couple of years ago,fortunely only took 15 min. because I don't have the stock airbox setup.Unfortunely it was the morning of my Dad's funeral and I had to have the car going Sad


HHR Nole

Posts: 2089
Join date: 2012-10-16
Age: 57
Additional HHR Info: Nole is a '07 2.2L LT1 with just a "few" mods............Adopted 12/28/06. Jan.'09,Jan.'11,Jan.'13 HoTM,'09 HoTY .'10,'11,'13 ToTD Dragonslayer

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Post by CJ on Tue Dec 25, 2012 7:24 pm

great one

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Sean (Shagy) 11/1/88- 5/1/05 died in a fluke accident at age 16.5 to the day

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Join date: 2012-10-14
Age: 61
Additional HHR Info: ShagySS- 2008 HHR SS, Black, Manual, Trifecta tuned, rear sway bar, front strut crossbar, Flat matte black racing stripes w dark blue pinstriping, oxford blue 2 tone interior highlights

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