Help: Is Water Thermo Valve Supposed To Be Sucking Air?
 

Is the water thermo valve suppose to be leaking air out by the knob? You know the plastic valve on the cable side of the throttle body.

The valve(plastic) on top of the thermowax?

No, if air's leaking out (in actually) it's broken. This vac leak will cause problems...

what kinda problems will this create? My cold start issue has been solve thanks to NZ mentioning the word BAC valve. I forgot to reconnect it when installing my TB!!

chris

Same problems as any other vac leak. Bad idle mostly.

ok thanks!! Its leaking at the valve, I dont have an extra one so im gonna have to duck tape it or something or goop it.

Chris

You don't need to mess with the thermovalve itself. Just remove the vac line and put a cap on the manifold nipple.

I just purchased a new water thermo valve from mazda and hooked up the vacuum hoses and heard the valve sucking air. Does this mean the "NEW" OEM part is broken?

there's a filter under the plastic end cap, you know, for a metered vacuum bypass, ie a vacuum leak that is normal. iirc when cold the vacuum is applied to the double throttle butterfly, warm it bypasses.