Have 2006 Chevy hhr 2.4. Last year it got a new problem, no brake assist ? Found vacuum line from booster to intake manifold freezes at manifold fitting, once I remove the ice its good again for awhile ? What should I do to fix ?

 

A list of "could be"

Loose connectors
Bad booster
Bad hose
Bad one-way valve

I have never heard of a freezing vacuum hose. Don't know.

 

Hmmmm interesting......

Since ice can ONLY form from moisture, I would attempt to locate the source.

 

It's most likely a vacuum leak somewhere admitting atmospheric air, cold air + low pressure can lead to icing, it used to happen with carburetors on cars occasionally.

 

Is the line itself freezing or the check valve? I ask because though I've never experienced this with an HHR, it was a known problem in some Nissans from the early 2000s. On a 2002 Altima I once owned, the check valve was built into the rubber hose and the check valve had become faulty and would stick but only at cold temps......when I warmed up the engine it would release and function properly. Not sure if the HHRs setup is similar or not.

 

The check valve (one-way) is the plastic connector at the booster. There is also a splice connector midway on the hose, I'm not sure if it has any other function.

 

most of time it freezes rt at fitting in intake where hose goes on, if i pull hose off clean out ice with little screw diver is fine for awile, have had it freeze in hose too, i thought maybe it had something to do with pcv system ? they dont have a regular valve like older cars ? RT ?

 

The connection should be air tight. If not that may be the problem.

 

any other ideas ??

 

Since it appears that you're getting moisture in the line, there is a possibility that you somehow have water or moisture inside the brake booster. How ? Not really sure.
But the fact is, the booster works off of vacuum, so any air/moisture would in theory be pulled from the direction of the booster towards the engine.

(just trying to think outside the box so to speak)