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I changed my thermostat last year as preventative maintenance not knowing when it was done last. I used a Motorcraft Thermostat during replacement. My coolant temps typically stay at 190 cruising like they should, when I hit a good hill they will get to 198. Currently I have green coolant which was already in my truck, but I was thinking of doing a flush eventually. Should I stick with green or switch to Ford Gold? Is it bad for 1999 modular engines to switch coolants? I have read the water pumps may not be compatible.
Switch to the Gold, it lasts longer and is not as prone to "drop out". Just make sure you flush the system really well to get all the green coolant out. Wouldn't hurt to reverse flush the heater core too. I bought a Motorcraft Tstat at my local Ford dealer and the parts guy told me they all use the 180degree tstat now.
I'm thinking of doing a coolant flush on my 2005. I bought it about 5 months ago with 107K miles on it and have no idea about its history. If I move up to Ford Gold coolant...why would having it mix with a little green coolant be an issue?
Also, I've got a scangauge and I'm running from 205 degrees cruising to 220 degrees climbing? Does the 2005 have a different tstat or do I need to have mine replaced?
Also, I've got a scangauge and I'm running from 205 degrees cruising to 220 degrees climbing? Does the 2005 have a different tstat or do I need to have mine replaced?
I chased that gremlin this summer. I talked ad-nauseum to the Ford tech about it. He said it is perfectly fine. I had the thermostat changed and a full flush with no change to temps. Pulled 5-7k at 70-90mph over the summer up and down hills and mountains without any issue. My fan works and never came on during any pull. My highest temp was 218. I know many on this site say their temps are lower and thus began my tail chasing.
Some maintenance items you will need to go with OEM, others aftermarket. Coolant is a definite OEM Gold.
I chased that gremlin this summer. I talked ad-nauseum to the Ford tech about it. He said it is perfectly fine. I had the thermostat changed and a full flush with no change to temps. Pulled 5-7k at 70-90mph over the summer up and down hills and mountains without any issue. My fan works and never came on during any pull. My highest temp was 218. I know many on this site say their temps are lower and thus began my tail chasing.
Thank you! The people with the lower temps on this site were the primary reason I was concerned. It looks like I just have a little warmer running truck. Fortunately with the scangauge I can see immediately if the temps get outside of my normal.
Switch to the Gold, it lasts longer and is not as prone to "drop out". Just make sure you flush the system really well to get all the green coolant out. Wouldn't hurt to reverse flush the heater core too. I bought a Motorcraft Tstat at my local Ford dealer and the parts guy told me they all use the 180degree tstat now.
Hmmm, I got mine through the Ford dealer Summer of 2014. Will have to call and see if there is a different one.
Looks like I will start rounding up coolant soon.
Need to swap the passenger ball joints and probably do front diff fluid prior though.
I'm very curious to know if anyone has tried "Evans waterless antifreeze" in a V10??
I have a 2000 X and just winterized with Ford Gold, as that is what was in it when I bought it. Instead of additives I'd rather just use waterless if it's okay in the 6.8.
TIA
Last edited by 1JoeSky_ExcurzII000; Nov 7, 2015 at 04:46 PM.
Reason: Needed it!
Switch to the Gold, it lasts longer and is not as prone to "drop out". Just make sure you flush the system really well to get all the green coolant out. Wouldn't hurt to reverse flush the heater core too. I bought a Motorcraft Tstat at my local Ford dealer and the parts guy told me they all use the 180degree tstat now.
I have been searching all over the interwebs and only see 190 degree thermostats from Motorcraft. It does appear there are 180 degree alternate temperature thermostats though.
Do you have a part number?
I'm actually using a propylene-glycol based coolant that is targeted at the marine industry. Forgot the brand name, I get it from my brother-in-law's warehouse.
Now, of course, Ford doesn't say you can use propylene glycol, but they don't say you CAN'T use it either. It's worked out great in all the vehicles I've ever used it in.
And I can dump it on the ground, or pour it into our sewer system, as it's just food for the bacteria that they use to treat the sewage
Motorcraft® Premium Cooling System Flush
Fast flush formulation
Compatible with all coolant types
Contains no petroleum distillates
Use to flush engine cooling system whenever coolant is changed or repairs are required
Does not require the use of a neutralizer
Safe for aluminum water pumps
Meets Ford specification ESR-M14P7-A
Available in 22-fluid-oz. bottles
I would just do a water flush thats what I did with good results. Seeing your post about thermostats from last year, v10's come with a 185° instead of the 192°. There are also 180° never tried one of those but I would have to assume that those would run about 185° in a v10 from what I have seen which is a bit cool I think. I put 192° in when I did the coolant flush and it would run 200°-202° empty on flat ground too hot for my liking. I tried couple other 190° motorcraft and stant tstats with the same results. Then found the right tstat motorcraft rt-1195 it is a 185° just like what came in it. Truck runs right at 190° now.
Unless you have a lot of crud built up in the system, I wouldn't use a chemical flush. No need. On the other hand if there IS a lot of crud, loosening it all up might not be good either
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