Question. I just bought a new AC Delco thermostat for my car (2007 HHR 2.2l) it did not come with an o-ring as I saw mentioned in other threads but there does appear to be a rubber seal around the thermostat itself. Do I need to get an o-ring or does that rubber seal take it's place? Is any other type of sealant needed? Thanks in advance for any help.

 

It has a rubber ring around it , no sealant required

 

Did you get the 131-158 part number?

 

That is what it says on the package sir.

 

 

If you pull on that rubber it will come off the stat. That is the O-ring.

 

 

We say O-ring for convenience. it is a rubber grommet that goes around the outside and seals the housing. The other t-stats have one on the valve part, it tends to fall partially off and blocks the valve open.

 

Which thermostat is this then?

 

You got the good one.