Changing t-stat - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 11-23-2009, 03:01 PM Thread Starter
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Changing t-stat

Going to change my t-stat. Got a 203 one with a new housing from the Dieselsite. From what I have read you pretty much have to drain the rad to change it. Figured that anyway. What's the procedure for getting air out once refilled? Is there a bleeder valve/screw or do you just leave the degass bottle cap off & let it run for a while? Or does it bleed itself?

2001 f-350 ext.cab. 7.3 auto non dually. 262k miles. New HD tranny at 67,000 miles. Boost, EGT, Tranny temp gauges. 04/10 DIY check valve VO conversion. 20 plate FPHE,Fass HPFP set at 70 PSI,TIH, 10 micron spin on filter with coolant wrap, 150 micron prefilter, hrydraforce purge valve, 40 gallon greasecar tank with hotfox, SS braided hose to heads, Oil temp, pressure & fuel level gauges. 110K miles on grease. Monitoring with Torque.
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post #2 of 5 Old 11-23-2009, 09:17 PM
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I just pull the upper hose where the thermostat housing is, and let it drain to that level. You don't have to drain the whole thing. It will be a little messy, but you can change the t-stat, put the hose back on, and re-fill. Rinse the belt with water to get the antifreeze off of it. Then fill the system slowly with distilled water and antifreeze in equal parts. It pretty much self bleeds as you fill it. The coolant bottle is the highest part of the system, so the air goes there to escape. squeezing the upper hose will pump the air out faster too.

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post #3 of 5 Old 11-24-2009, 04:43 AM
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203 Thermostat = Placebo, sorry but 8 degrees ain't going to make any difference and they aren't cheap. Live and learn, but het you got a sharp looking housing. What color did you get? As for install place a 5 gal bucket under the drain valve on the drivers side of the rad. Fill the bucket half full, then replace the thermostat, and I would also change the upper rad hose to the one used on the dual alt set up that goes around the fan belt and not through it!! Adding a coolant filter and switching to a true ELC coolant would be a good idea to, but that is another thread. reinstall and fill back with fluid, you won't loose a drop. Make you check your SCA level if you haven't lately.

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post #4 of 5 Old 11-24-2009, 01:45 PM
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Quote:
Originally Posted by NCHornet View Post
Make you check your SCA level if you haven't lately.

NCH
Where is a good place to buy the little test strips? I really need to check mine or just flush the coolant and put the cat stuff in there!

Just a basic 01 F350 CCLB SRW -Good from a far but far from good
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post #5 of 5 Old 11-25-2009, 06:21 AM
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Napa has them, but check the exp date. They are only good for a short time. My Napa had to order three different times before I got good ones. Then switch to the Fleetrite coolant and never have to check it again!!

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