i installed the mark VII on the vell over the weekend and my results don't seem to be no were nere as good as all the ones i've heard on here. the weather was in the mid 80's and stayed between 200-205 all day

i have the fan on 4 core radiator and a big block. i have a 180 stat. i think i wired it the right way.i did the toggle switch 40A relay and in line 40A fuse the power comes stright from the batery. i also got 105 amp alt. with 70amp. at idle

As long as your wires are big enough to handle the load, I think you did it right.

Mine moves so much air it's scary.

Does the temp come down when you're cruising at 50? I only run mine while driving around town or any other situation that requires a lot of stopping.

Maybe your trouble lies elsewhere.

------------------
My Web Page (http://www.landry-family.com) (updated 06-21-02)

"Long Live Freedom!"

Chad Landry
TC Member #643
ACES Member #4556
'68 El Camino, 357, L31 Vortec heads, 700R4,
8.2 10-bolt, 3.55 gears, Auburn Pro Posi.

You may have yours wired to the 'slow' speed side of the fan...it has two speeds at the terminal and there is a big difference in total CFM output between the two.

Hey Chad, how ya' doing?!

------------------
502 Rat Infested 1970 Malibu - Gold Member #39
Keep America Beautiful - Drive A Brute Force Chevelle!
http://bruteforcechevelle.freeservers.com/

Doing great, Wes! http://www.chevelles.com/forum/smile.gif Just sent you an email with probably more details than you need. http://www.chevelles.com/forum/wink.gif

------------------
My Web Page (http://www.landry-family.com) (updated 06-21-02)

"Long Live Freedom!"

Chad Landry
TC Member #643
ACES Member #4556
'68 El Camino, 357, L31 Vortec heads, 700R4,
8.2 10-bolt, 3.55 gears, Auburn Pro Posi.

I thought the mark 8 fan drew more than 40 amps?

Seems like I heard people saying they were using 70 amp relays.

------------------
Charles Perrell
cperrell@yahoo.com
65 malibu SS Convertible
283 2v powerglide

<BLOCKQUOTE>quote:</font><HR>Originally posted by cperrell:
I thought the mark 8 fan drew more than 40 amps?

Seems like I heard people saying they were using 70 amp relays.

<HR></BLOCKQUOTE>

I measured mine with an LCD display DC Amprobe. It was 38.4 amps at 14.3 volts if I remember correctly. People use the 70 amp relays because that's the next larger size.

I run two parallel relays that were sold as 30 amp relays but are marked "40A". Still going strong after 15 months.



------------------
My Web Page (http://www.landry-family.com) (updated 06-21-02)

"Long Live Freedom!"

Chad Landry
TC Member #643
ACES Member #4556
'68 El Camino, 357, L31 Vortec heads, 700R4,
8.2 10-bolt, 3.55 gears, Auburn Pro Posi.

A friend of mine put in after market fans, didn't cool well, I found he wired fans backwords, fans were pushing air back to the ft.of the car.

------------------
My cars (http://www.geocities.com/gdwrench64/carphotopg1.html)

when i first wired the fan i mad sure it was pulling the air toward the engine.on the terminal on the fan i used the two out side prongs and did not mess with the center one

if i bought a better stat would i see any change.

[This message has been edited by coololguy (edited 07-07-2002).]

Chad, good to hear from you - you've got mail. http://www.chevelles.com/forum/smile.gif

Coololguy, you're using the correct terminals so that isn't your problem...unless for some reason they were swapped for your model fan. I've heard there are different model MarkVIII's. Mine is going on 3 years old and uses the outside terminals too - one for high speed and one for ground. The center terminal is for the low speed circuit. Try switching yours to the center terminal so that can be ruled out. You'll notice a difference in the amount of air moved.

The 180 stat you have should be perfect with your combination. Other areas to consider are water pump and belts. What about your ignition timing? Any chance you have altered that about the same time? Are there any obstuctions in front of the fan?





------------------
502 Rat Infested 1970 Malibu - Gold Member #39
Keep America Beautiful - Drive A Brute Force Chevelle!
http://bruteforcechevelle.freeservers.com/

You might also check the jetting on your carb.

Where are you reading your water temp? Reading from the head will show a higher temp than the intake. I have my gauge set up on the intake and the idiot light set up on the head.

Keep after it and please let us know the conclusion. I'm sure it's not the fan if it runs the same temperature cruising as it does sitting in traffic.

------------------
My Web Page (http://www.landry-family.com) (updated 06-21-02)

"Long Live Freedom!"

Chad Landry
TC Member #643
ACES Member #4556
'68 El Camino, 357, L31 Vortec heads, 700R4,
8.2 10-bolt, 3.55 gears, Auburn Pro Posi.

I am scratching my head over this one too. I have heard and scene nothing but good things from these fans.

It bothers me that it won't run on the thermostat if the temperature gauge is correct and in the intake position. If the heads is the location, then the temperature readings could be the correct reading due to exhaust tainting.

Changing the thermostat will NOT affect the overall cooling capacity of the system, just manages the opening/cycling point of the system when the cooling system can run on the thermostat. What you have is perfect if in fact you know that it's correct and operating.

Like cj stated, let us know more and how it's working with you.

------------------
Steve Jack
-Concept One Pulleys and Brackets
-Engineering & Marketing Technologies
-Northern/Southern Rodder Magazine's "Jack'Stands" technical column author/originator

[This message has been edited by HOTRODSRJ (edited 07-07-2002).]

Verify that your thermostat is opening at the correct time.

I installed the dual windstar fan setup and my car continued to run at 205-210, with a supposed 180 stat. Switched to a 160 stat and now it runs at 185-190.

------------------
Chris Dagenais
'71 Malibu with a home built 454! 12.7@107
For everything you do, this burnout's (http://www.71malibu.com/Burnout.wmv) for you.
The Green Monster (http://www.71malibu.com)

thanks for all the input. i'll try what u all have said and see what happens.

i forgot to add this i got my temp. sending unit in the head if that matters

Ooops...yes it does.

The head sensing location can be up to 30 degrees higher than the actual water temperature due to exhaust/header port temperature tainting.

Depending on the head material, the distance from the exhaust port, the air movement thru the engine compartment to cool the headers, it will vary greatly. This is why the intake is the best place AND MOST CONSISTENT place to sense temperature. I have seen temperature readings vary greatly at idle to cruise, but the actual water temperature not.

------------------
Steve Jack
-Concept One Pulleys and Brackets
-Engineering & Marketing Technologies
-Northern/Southern Rodder Magazine's "Jack'Stands" technical column author/originator

so this is why i may not have not seen a change in the temp? the head is the good ol cast iron.

My bet is that you will see a more likely closer to the thermostat reading if moved to the intake. Since heads are all designed differently, and airflow thru the compartments differ greatly, it's hard to tell just how much it will make. But, the intake location is the most consistent and accurate.

------------------
Steve Jack
-Concept One Pulleys and Brackets
-Engineering & Marketing Technologies
-Northern/Southern Rodder Magazine's "Jack'Stands" technical column author/originator