'94 GMC S15 Jimmy 4.3L W Vortec w/ AT 138k miles

After replacing the head gaskets, my heater blows cold. I flushed/reverse flushed the heater core and it still blows cold.

Did I not connect the vacuum lines properly? Everything seems to be working fine (HVAC switches seem fine).

I need a vacuum diagram to troubleshoot this problem.

Im also in need of a vac line diagram but for a 98 Jimmy. If someone has a book please scan it. Maybe It'll help at least one of us or maybe more.Ive serched the web for numerus hours and no luck at all.I know someone out there has to have it.Please, just give it up it will be greatly appreciated.<didnt want to start new thread>

There is a thread at the top of the forum that has answers to most questions, it also has some of the rules that need to be followed. Posting in old threads is a violation of the rules.

Here's a link with the answer to your question:
http://www.automotiveforums.com/vbulletin/showthread.php?t=503195

Here's the link that you should read to find answers to many more questions, you should also read it to avoid breaking any of the forum quidelines:
http://www.automotiveforums.com/vbulletin/showthread.php?t=547511