follow up to defrost -- thanks jo and tiger

I finally checked out that vacuum valve for defrost. it does hold vacuum. it will move if I apply vacuum to it. started the car and switched to defrost
then back. there is no vacuum on either of the two vacuum lines that attach to this valve. - with the car running. what could cause this??
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Check for vacuum at the firewall... the yellow checkvalve... make sure you got vacuum there.
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ok i will try that. thanks

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