ignition lock

I'm working on our 95 GMC Safari van for vehicle inspection, and am unable to locate the 'turn signal "flasher"' unit. I've read many other posts in this forum and am pretty certain what I need to do once I find it. Background...when I click the turn signal to the left or right position, the lights internally and externally come on, but they don't 'blink'. they just stay on. The hazard lights blink properly. I have the original owners manual and a Haynes manual, both of which don't have enough detail. I've been ubable to log in to 'autolibrary.org', but did check the cyberpartspro.com, which didn't give me the info I need....good stuff though, thanks for the link. I've tried locating the 'flasher' unit - just under the lower trim panel, below the hood release - and can't find any connection or 'loose - unattached' parts that may be what I'm looking for. Is it possible that during some previous work (we're 2nd owner), the trim panel and flasher unit may have been taken off and discarded? My next step is to go to a parts store, purchase a correct flasher unit, and see if I can match it to anything under the dash, in the vicinity of where the manuals have directed me. Can you give me or direct me to any information on what this unit may look like? Any other thoughts would be helpful. Thanks in advance, I find your site extremely useful. TJ

Update: New tension pully still sitting on garage floor. I bought one of those super skinny ratchets, and a "stubby" socket; still doesn't fit. to Joe_f: Thanks for the other web site tips, lots of great info, but nothing (that I could find) on replacing a tensioner. I asked a GM specialist and got the "Just Bring It In" speech. Another garage "name witheld" CLUE:" The one named after burning rocks." ; said they would try without responsibility. Chilton book: NO mention of the tension pully. For New Readers: I broke my tension pully on a 1991 Chevy Corsica 3.1L V-6, and have no clue on how to change it. WHAT I DO KNOW: 4 people said that I have to remove the wheel, wheel assembley, splash guard and lower the engine a little. ( NO WAY IN HELL FOR ME!!!) - it has a one bolt connection from the front. -the space between the wheel well and the tension bolt is 1 and 3/4 inches. -this problem is common on this model car-- thanks to about.com. -it cannot be reached from underneath. -the bolt aligns with the metal wheel-well, and there is no pre-drilled hole for a ratchet. -Doug66's idea of drilling a hole in it is looking pretty good right now!! -GM got smart, the new tension pully has a flush mount bolt( not a recessed one ) which can be accessed from above with an open box wrench. -Its a $160.00 tow to the nearest Chevy dealer (3 quotes)(( NO WAY!! )). -This DIY'r is dying!! -I appreciate and thank you all for all your help on this!! -I'M SCREWED!!!