Prior to using VC-9. My temps. were at ect. 196, eot.206, was the lowest, and avg.ect 208,eot.220, with no load. hit 216,eot 230 towing 7,000 lbs. While this isn't outrageously high it is higher than others posted, I did a flush a year ago with simple green and a Prestone cleaner..The coolant has been very clean and I have the coolant filter which has shown no particles.
While doing the VC-9 flush I drove on the hiway and after 45 minutes started seeing a drop in temps.( I ran the flush for a hour and half.) The lowest temps. now read ect. 189. eot 193. Avg. temp. is ect 191 eot.194.The spread pulling hills did not go over 8 deg. and never went above 200 on either eot. or ect. It also seemed to cool quicker, but I have no times to verify how much faster. This is all at comparable outside temps. give or take 2 deg. With ac. on high.
The flush water with VC-9 was black and dirty. And did 7 flushes to get to clear water. The coolant filter had a bunch of white sand and some metal flakes which about one third was rusty. This was just from banging on concrete floor.
I thought I had a pretty clean system before and was totally amazed at the results of the VC-9. The results are better than I could have ever imagined. Just thought this info might be useful to others who are hesitant to spend the money and time for the VC-9.

 

Hey flamebuster Thanks for sharing the info on your results with VC-9

 

Rock1074; Your welcome. I figured the results were worth mentioning since it is expensive when you figure in all the flushes of distilled water, it is also time consuming. But it was exciting to watch the insight temps. slowly come down and narrow the gap between eot. and ect. I had read to run about 30 minutes but found things starting to change the most after 45 minutes. Speed was 60-70 mph.

 

Great info. Thanks for posting.

 

Thanks flamebuster, this is very interesting. I currently have a 30 degree spread. What's the longest you should keep the VC-9 in your system? I'm temped to try this for as long as possible to see if it helps. The dealership just recently did a flush with the VC-9 a few months back, but not very long and only rinsed once with tap water.

 

I did a flush about 6 months ago..Tried to save a few bucks and didn't use VC-9. I am going do do another flush with VC-9. I also would like to know how long I can leave it in without doing damage or Will It Do Damage If Left In To Long???

 

See this thread, post #4 by cheezit for full VC-9 instructions.
https://www.ford-trucks.com/forums/8...tructions.html

 

Thanks Bill, I know how to do the flush. Just wanted to know if the VC-9 can be left in for any length of time.(day or two) without causing damage to the cooling system..

 

I don't have any reference to offer, but it is a caustic cleaner, and as such I would never leave it in the system longer than instructed. I doubt if 2 hours instead of 1 hour would do any harm. But all day? No.

 

There is nothing printed on time so far as I have ever seen. Maybe mark or one of the other techs can chime in. I would venture no more then 100 miles or so and I would try not to leave it in there for longer then needed. Im thinking an hour or so. but Like I said all guesses.

 

thanks for the information bpounds and Cheezit. I didn't remove the thermostat and never even thought of pulling the block plug. It took a few more flushes to get clean water draining out, but hey I am still learning. I was worried about leaving the VC-9 in too long but after seeing the temps. drop after 45 minutes I figured it was just starting to do some good cleaning so I just kept heading down the hiway.. I had read in a post that it was better to drive at higher speeds instead of just around town. Guess that part was inaccurate but the trip was funner than watching a truck high idle in the driveway.lol.
Cheezit why remove the starter?

 

I think the highway driving is really a better deal because it will keep a constant flow.

the reason for pulling the starter is to remove the right side block plug. its behind it.
I know stupid but thats the only way.

 

Here's a whacko thought: How much clearance is between the starter and the right side of the block?

Is there enough room to install an elbow into the hole for the drain plug, and then a 2-3 inch pipe nipple to get the plug down far enough to NOT have to remove the starter on subsequent flushes?

-blaine

 

Thanks for the great info flamebuster. I'm due for a coolant flush and I've been concerned about higher than normal coolant temps and so hopefully using VC-9 during the flush will yield me the same results that you have seen. This is a great topic for anyone who does their own routine maintenance.

 

dc3655 chime back in after your flush, It would be very interesting what everyone gains from the flush...
Thanks cheezit for explaining the starter removal.