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Old 07-09-2009, 08:51 AM   #1
wayneg
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Default How to Flush Radiator

I just joined this forum so please let me know if this question should be posted elsewhere.

Anyway, I have a 2005 Ranger with a 2.3 engine and auto trans. Just turned 30,000 miles. I decided to flush and refill the radiator, and have these questions. One: there appears to be no radiator cap. I'm used to sticking a hose in the cap hole and running fresh water thru for a bit after draining, but I obviously can't do that here. Do I instead pull off the top hose and flush thru there? Second question: do I pull off the bottom hose to drain or is there a drain plug accessible once I remove the plastic cover/protector that's held in place by four plastic plugs?

Any and all advice/guidance will be greatly appreciated!
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Old 07-09-2009, 09:24 AM   #2
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i don't know about your specific vehicle, but alot of them have some drain plug like a wing nut orsomething of the sort at the bottom of the radiator... you have to have a radiator cap don't you?!
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Old 07-09-2009, 09:35 AM   #3
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your radiator cap is probably on the over flow bottle. you can either flush from the upper hose or pull a heater hose and flush that way (this way you can make sure you get all the old coolant out of the heater core. there also should be a drain on the passenger side of the radiator. what are you planning to put back in it for coolant, good ole green stuff or the extended life stuff?
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Old 07-09-2009, 10:08 AM   #4
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I was going to put in the yellow/golden extended life stuff, since that's what it was delivered with. Would the old-time green antifreeze be a better choice?
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Old 07-09-2009, 10:11 AM   #5
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Pull the top and bottom hose to flush the radiator. Remove the thermostat and flush the block. Some heaters have a control valve. Remove the hoses at the heater connections if your's has the valve.shady
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Old 07-09-2009, 10:13 AM   #6
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Also, I guess my "radiator cap" is on the coolant overflow bottle. I just took a look at that cap and it's marked 16psi, so I guess that's it. I'm just used to the cap being on the physical radiator itself, which is not the case here.
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Old 07-09-2009, 11:31 AM   #7
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Quote:
Originally Posted by wayneg View Post
I was going to put in the yellow/golden extended life stuff, since that's what it was delivered with. Would the old-time green antifreeze be a better choice?
Use Zerex G-05. It's the same gold extended life stuff that's in it. Regular green would not be better.
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Old 07-09-2009, 02:19 PM   #8
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I would put the extended life stuff back in. Unless you get the antifreeze that's compatible with everything, plain ol' green stuff should not be mixed with the gold/yellow extended life stuff unless you flush the system REALLY REALLY well. IMO not worth the effort so I get the mix-with-anything stuff.
On most cars and trucks, as long as I can reach it easily, I just pull off the lower rad hose to drain it, much faster that way. Stick it back on, don't bother with the clamp, fill with water, run, drain, and repeat. Ditto the upper hose to fill the system. I don't bother removing the thermostat.
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Old 08-10-2009, 09:23 PM   #9
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I was just getting ready to post this same question. WayneG let me know how this worked out for you.
Thanks.
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