How to MarkVIII your OBS on a budget..!

[chevyman("]

I ran dual 12's on my 98 at first And they had tremendous trouble keeping up with my engine it would slowly over heat with them on sitting still if i were you id go to a junk yard and find a crown vic or tauras fan or something like ls1 fans or something like that bc i think you might regret those 16's


Vortec powered iphone

 

[Tricky's_Limitedhoe]

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

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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..!

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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...

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

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All bolted in...

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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...

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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...

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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...

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30 amp self resting circut breaker...

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

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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...

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Post Ur setups wen complete..!

On the post it states that the hose fitting adapter was not the same size as the temp sensor, so has anyone found one with a direct fit and a part number for the hose adapter and temp sensor?

 

[Cadon69]

On the post it states that the hose fitting adapter was not the same size as the temp sensor, so has anyone found one with a direct fit and a part number for the hose adapter and temp sensor?

Yes I have found an alternative that is a perfect fit. I have it on my desk in my office even. I am currently sitting on the pot and " helping" hang Xmas lights LoL! As soon as I can get a chance to go in my office and look I can snap a pic and get you all the info on where I got it. I do remember it was about $24 delivered.


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[Cadon69]

On the post it states that the hose fitting adapter was not the same size as the temp sensor, so has anyone found one with a direct fit and a part number for the hose adapter and temp sensor?

Ok here is the info and a few pics of mine. You can purchase the splice from the link below. Enter "1-5/16 x 14 mm x 1.5 p" under the "specify size" tab

http://www.jagsthatrun.com/Pages/Parts_TPI-TBI_Brass-Tees.html

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[gojo83]

Has anyone used the prewired setup in a 98? doing a little looking and it looks like there is a wire that will act as a switch?
http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/pcm-connector-pin-outs-1998-1999-page-4
I know the 411 swap is popular, but currently I cant do that swap so by simply doing the factory switch for now means I could switch to the E fan and try and do the pcm swap later.

 

[Tricky's_Limitedhoe]

Thank you.

 

[K15 Blazer]

I put the Lincoln mark 8 fan inside my stock housing... it worked great!.... until the motor burned out and seized.... which sucked bawls because I think I gained about 3 MPG, better throttle response, and at least 10 HP..... but, if that had happened out camping/off-roading I would have been totally effed..... so now im super sketched about electric fans... but still wish I had one

 

[Aloicious]

Has anyone used the prewired setup in a 98? doing a little looking and it looks like there is a wire that will act as a switch?
http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/pcm-connector-pin-outs-1998-1999-page-4
I know the 411 swap is popular, but currently I cant do that swap so by simply doing the factory switch for now means I could switch to the E fan and try and do the pcm swap later.

I'm not 100% sure, but I believe the 98 blackbox PCM is able to control the fans to some extent, however you will need the PCM properly tuned for it. I don't think the 96-97 blackbox PCMs can though.

 

[gojo83]

I'm not 100% sure, but I believe the 98 blackbox PCM is able to control the fans to some extent, however you will need the PCM properly tuned for it. I don't think the 96-97 blackbox PCMs can though.

Awesome I got a tuner and can tune my 98 so I was just double checking before I really dig into it

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[monstar_est87]

Tricky its about time u jumped on it...
@candon nice work...