How to MarkVIII your OBS on a budget..!

[MC153]

I ran dual fans with the Jeg's kit for a while with the stock alternator. It's a good idea but you don't have too...

Alright that's all I wanted to know. I'm gonna do this sometime in the next month. Only thing different is I'm gonna stick an LED indicator in mydash so I know when it's on.

 

[orange57]

I also plan on doing this. I have seen the dual fan setup for an 05 plus on amazon for 150 bucks. Will that bolt right in?

matt

 

[retorq]

Alright that's all I wanted to know. I'm gonna do this sometime in the next month. Only thing different is I'm gonna stick an LED indicator in mydash so I know when it's on.

I was going to do that at one point but never got around to finishing it.

 

[saif najd]

New important update!!

Never use any steel material for your water cooling system!!

Something bad happened I will explain today after I get home the story and how to prevent it

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[zomeizter]

Paid a visit to my nearest PickNpull and got me some efans to convert my OOBS vics and in the process I learned somethings I'd like to share. When I researched this mod, I was informed to use the efan from 3.8L equipped Taurus and Sables so I got a couple of those. Then, I ran into a couple T-birds and Cougars with either the 3.8L or 4.6L and noticed these had a similar efan but was a bit bigger assembly, but they have the exact same efan motor, with the exception of riveted motors as opposed to bolted, no big deal. If I'm not mistaken, these are the same as the Mark VIII right? I also grabbed a couple of efans from the latter vics and an additional dual fan setup off a Windstar which actually turned out to be a sweet set up, the assembly is long enough to completely cover the whole radiator in any of my vics and one of the efans is dual speed, the one right beside it is single speed, think this will work nice with an A/C equipped truck
So I came home with 3 efans from a Cougar/T-bird, 2 efans from a Taurus/Sable with a cost of 12.99 each. Also got a dual fan assembly off a Windstar for a whopping 19.99 and 4 Volvo 2-speed efan relay assy's at no cost
Now I need the efan temp switches but I would rather not use the Bemer dual temp type, I'm gonna experiment with the single units and use them for one speed and mechanical switch for the second speed, I'll figure it out as I go. One more thing, I found some bosch style 60 amp relays on ebay that are quite cheap, has anyone used these for the efan setup? Do they handle the current draw? Holler...

 

[saif najd]

Paid a visit to my nearest PickNpull and got me some efans to convert my OOBS vics and in the process I learned somethings I'd like to share. When I researched this mod, I was informed to use the efan from 3.8L equipped Taurus and Sables so I got a couple of those. Then, I ran into a couple T-birds and Cougars with either the 3.8L or 4.6L and noticed these had a similar efan but was a bit bigger assembly, but they have the exact same efan motor, with the exception of riveted motors as opposed to bolted, no big deal. If I'm not mistaken, these are the same as the Mark VIII right? I also grabbed a couple of efans from the latter vics and an additional dual fan setup off a Windstar which actually turned out to be a sweet set up, the assembly is long enough to completely cover the whole radiator in any of my vics and one of the efans is dual speed, the one right beside it is single speed, think this will work nice with an A/C equipped truck
So I came home with 3 efans from a Cougar/T-bird, 2 efans from a Taurus/Sable with a cost of 12.99 each. Also got a dual fan assembly off a Windstar for a whopping 19.99 and 4 Volvo 2-speed efan relay assy's at no cost
Now I need the efan temp switches but I would rather not use the Bemer dual temp type, I'm gonna experiment with the single units and use them for one speed and mechanical switch for the second speed, I'll figure it out as I go. One more thing, I found some bosch style 60 amp relays on ebay that are quite cheap, has anyone used these for the efan setup? Do they handle the current draw? Holler...

If you want to have the best results I would suggest you change the coolant temp valve mine open when it hits 90C or 91C so it stays around the 86C ~ 90C if you didn't do that you well not get the result you are hoping for.



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[zomeizter]

By coolant temp valve, do you mean thermostat?

 

[saif najd]

By coolant temp valve, do you mean thermostat?

Yes, sorry I forgot the name

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[zomeizter]

OEM T-stat mandates a 195F rating, that's what is in all my horses. After some extensive research on fan switches, I have decided to try a SW500 made by Airtex/Wells and used in 80's/90's GM 2.8L engines. Gonna pick one up after work tonight and begin the mod, I will report results...

 

[oakdog]

Hey zomeizter when does this switch cut on and off

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[saif najd]

OEM T-stat mandates a 195F rating, that's what is in all my horses. After some extensive research on fan switches, I have decided to try a SW500 made by Airtex/Wells and used in 80's/90's GM 2.8L engines. Gonna pick one up after work tonight and begin the mod, I will report results...

Mine is from Mercedes

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[zomeizter]

Oakdog, the advertised closing of the switch was 230+/-8 degrees and they did not lie!! I ran my truck for a few minutes at high idle and the needle went past the 210 mark, right when it hit the 230 mark the fan came on and stayed on only for about 10 seconds, maintaining the set temp very well, this is one bad *** efan!! Now, as for the 230 degrees running temp, I'm not so sure I'm comfortable with it. Ima do some more searching and find a switch at my local autoparts house that keeps the gauge needle at 210-215. I set up the circuit so that the CTS turns on the high speed on the fan, the low speed I control in the cab with a manual switch, which will probably only be used when I'm giving the iron horse some hell in the sand Besides running a bit on the high side temperature wise with the current CTS, I really like the way it all came together, thanks to all that contributed on this thread! Now that I'm happy doing this mod on my OOBS, it's time to do the mod on my OBS Yukon, holler...

 

[zomeizter]

So after I completed the efan setup on my 'nali, I'm wondering if it is necessary to use the original shroud to encase the efan. I did not do that at all, but I ensured the efan was as close to the radiator core as possible. It is currently working great, as soon as the efan comes on, it only takes a few seconds for the temperature to drop and the fan shuts off. I guess we'll find out once I put this baby on the road and hit some dirt.

 

[saif najd]

So after I completed the efan setup on my 'nali, I'm wondering if it is necessary to use the original shroud to encase the efan. I did not do that at all, but I ensured the efan was as close to the radiator core as possible. It is currently working great, as soon as the efan comes on, it only takes a few seconds for the temperature to drop and the fan shuts off. I guess we'll find out once I put this baby on the road and hit some dirt.

I didn't use it (actually I dont have it haha) I would suggest you isolate the uper side of the radiator so hot air dont be pulled back be the efan.

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---------- Post added at 05:29 AM ---------- Previous post was at 05:29 AM ----------

I didn't use it (actually I dont have it haha) I would suggest you isolate the uper side of the radiator so hot air dont be pulled back be the efan.

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It is the upper space between the bridge and radiator

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[zomeizter]

Ok, so I found some CTS's that will keep the temp at about 210F. If anyone is interested, the part numbers are (Wells/Airtex) SW510 which closes at 210+/-8F and SW555 which closes at 210F and opens at 205F. Efan setups are currently working great.

 

[saif najd]

Ok, so I found some CTS's that will keep the temp at about 210F. If anyone is interested, the part numbers are (Wells/Airtex) SW510 which closes at 210+/-8F and SW555 which closes at 210F and opens at 205F. Efan setups are currently working great.

Great

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