Look for a cracked vacuum reservoir (plastic sphere under the air cleaner), melted/cracked vacuum lines between the reservoir and the HVAC plenum or leaks in any vacuum lines or servos under the dash. There's also a small chance that the check valve in the reservoir isn't doing its job.

It would help if you had a hand vacuum pump (Mityvac) or could borrow one.

 

thanks bob.

i will check it out, tomorrow morning.

don't have time this afternoon.

i really appreciate it.

 

What did you find? Mine is doing the same thing.

 

eh.

some sorta valve or whatever.

haven't had a chance or remembered to look into it.

the heat pretty much comes through all the time, unless i turn the ac on.

maybe the hose is just not tight on.

i will get around to fixing it soon enough. when i figure out what's what.

 

Are you coming down to Houston for the meet on Saturday? Maybe we can compare if you make it?

 

nope.

have to work.

i have a meeting from 8=9am and then work from 1-9pm... :(