Proper Thermostat Performance?

[blacksambo]

So, how do you get the air out? Thx

[tom4bren]

http://www.ehow.com/how_7369_burp-cars-cooling.html

& this one makes a good point that you should have circulation through the heater core while performing this process.

http://automotivemileposts.com/garage/v2n15.html

Most cars are 'self purging' & you don't have to worry about it. Since the closed loop cooling system has been slightly modified with the overflow reservoir to still be closed loop (no air can get in) but have open loop benefits (allow for fluid expansion without letting air in).

Some cars do have problems in the design. Mitsubishi Eclipse is notorious for trapping air behind the thermostat which will keep it from opening. In that case I was able to burp it by removing the temp sensor (which is right where the bubble gets trapped) & put it back in while anti-freeze was dribbling out all over my hand, running down my arm, & dripping onto my leg - point being: don't do it with a hot engine. All of that is irrelevent since you aren't working on my Eclipse but it is good background info for you.

Since I don't recall any VX owners complaining about having to burp their cooling systems, I don't think that this is your problem. But ... it's easy/cheap to do before you start tearing into your water pump or thermostat.

BTW, some parts stores sell a burping kit that is just a funnel that goes on & fits tight where the radiator cap goes. It allows excess coolant to replace any bubbles that escape & not allow any air to get back into the system. I don't think that you'll need that though.

[blacksambo]

I guess you feel I don't need to burp in this instance?

[tom4bren]

Burping always feels good so go for it

It doesn't cost anything & has a 15% chance of solving your problem. I'd give it a shot.

[blacksambo]

My radiator is full up and the expansion chamber half full, so I really can't add any but will watch with cap off when I cold start. Thx

[Jolly Roger VX'er]

[QUOTE/]Some cars do have problems in the design. [/QUOTE]

I thought my Fiero was tough to burp 'cause the engine is in the rear and the radiator is up front....lots of piping inbetween!

Also...when changing a heater core (general...non-VX specific) I've found it better to fill the bottom heater hose with funnel..connect to core...fill core to top with funnel...fill top hose with funnel....connect to core. This helps reduce chance of developing large air pocket in a new heater core which if happens you are stuck with waiting to burp itself.

sorry....back on topic!

[blacksambo]

I've read elsewhere(Audi site) given the extreme weather that I'm operating well within tolerance. I'll live with that. Thanks just the same.