How to MarkVIII your OBS on a budget..!

So this is how I setup my Efan... Consists of a MarkVIII efan, 96volvo duel speed fan relay and a 96 BMW temp sensor...


And here are the part #'s... #61318361787--BMW temp switch 180°/195° #61311378073--BMW temp switch 195°/ 210° #61131378412--BMW 90° angle connector #61130007445--BMW 90° green connector wires 2 required #61130007446--BMW 90° reen/black connector wire for ground #1398845--VOLVO dual fan relay... most of these can be found at any bone yard but I chose to buy the temp sensor, connector and wires new... The volvo relay I picked up with the wires at the local pick and pull... (this pic and part #'s I got from http://www.nastyz28.com/forum/showpost.php?p=2429746&postcount=123 ) so enjoy..!


So the first thing to do is to take the clutch fan off... This can be a p.i.t.a. if u dont have an extra set of hands...


I centered the mark8 fan shroud inside of my tahoes shroud, spray painted the mounting holes...


All bolted in...


New upper hose... Mark8 pigtail... The little gold thing is the bmw temp sensor... Summit inline hose adaptor (thanx sparg tyf)... and last the item is the volvo dual speed fan relay...


Bmw sensor on the summit adaptor ( http://m.summitracing.com/parts/ATM-2283 ) ... This summit adaptor came wit a 3/8 fitting for a sensor... But this bmw sensor is a 14mm x 1.5 so I plugged the 3/8 and drilled and tapped the other side to 14mm x 1.5...


So the way it works is the bmw sensor grounds the volvo relay at the first temp 180° and activates speed 1... Temp 195° grounds and actives speed 2... you'll probably never even use speed 2 unless you tap into your a/c controls like I did...

*** Update as of May 2013 I realized with the help of Sunlitcomet, that these temps are incorrect... I have a 160° T-stat my truck needs a 195° to burn efficiently... So unless ur supercharged a 160° may do more harm then good... Ive replaced the T-stat with a 195° and changed my BMW temp sensor to the higher temp part # 61311378073--BMW temp switch 195°/210°... I've added both BMW temp sensor part #s above so you can use which ever you like... I apologize if I mislead anyone...


30 amp self resting circut breaker...


Everything in place and wired up real nice like...


Again bmw sensor... Over all an awsum mod... Not very difficult... Just took a while to educate myself with these things and hunt parts down... In total I probably spent $70 to $80 if that... I hope this helps yall & good luck...

Heres my Wile E. Coyote schematic...


Post Ur setups wen complete..!

Sweet and vote for a sticky PLEASE

foreverfalcon40 said:

Sweet and vote for a sticky PLEASE

Click to expand...

x2! nice work!

x3..! I hope this will start a race of efan OBS's everywhere..! Muahahahaha..!

Monstar_est87 said:

x3..! I hope this will start a race of efan OBS's everywhere..! Muahahahaha..!

Click to expand...

and the END of E-fan threads!

Yea no kidding... And this set up can work on just about n e vehicle... Theres even another temp sensor that runs hotter 195°-210° 61311378073 if needed...

Do I dare ask if that fan is sealed against the radiator?

Ah Sunlit... Ive been expecting u... & no sir... Its nice and snug on the fan shroud...

Remember to ft rid as much free gap as possible otherwise it will not draw thru the radiator.

Thats wat I thought to... But wen stopped u can feel a really strong pull on the outside from the front...