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Swing by a junkyard and pick up a check valve or two.

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Haha you are right I didn't pay much attention to the first pic:thumbup:

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It's not unless it is real small and under the rubber boot. The 2nd picture above showing the tee to the main vaccum line is all there is, from there it is straight through the firewall.

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You probably need to check the check valve. It must be in the dash somewhere :banghead:

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Got off my butt and went and looked at mine last night. The first picture is where vaccum is picked up from the intake. The line runs around the firewall to the passenger side where the line tees...

If it is loosing vaccum it might default to defrost. At higher speeds it might not have enough vaccum. The manual shows testing the check valve with a hand pump other than that nothing. Mine has a...

According to my manual the vaccum comes straight from the motor. There is a check valve between the motor vaccum source and the heater control that sometimes goes bad.

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