Coolant: Drain, flush, re-fill faq? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 11 (permalink) Old 03-16-2007, 03:58 PM Thread Starter
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Coolant System: Drain, flush, re-fill faq?

I got a '93 3.5 L ES, never flushed the coolant system since I've bought it in '98. My ignorance has caused me to just check the level and fill it from time to time. The engine has never had any over-heating issues. Always runs normal temp.

I have a Haynes manual and the procedure seems pretty basic. Any suggestions and tips? It says there are 2 drain plugs on the engine block. There is no radiator cap, so I assume you fill it in the coolant overfill tank.

The next oil change I was planning on draining, flushing, and re-filling with a 50 / 50 mixture of distilled water and coolant.

Currently it is 100% coolant, no water. I've been told 50/50 it the best option.

thanks.

Last edited by mf2004champ; 03-16-2007 at 04:33 PM.
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post #2 of 11 (permalink) Old 03-16-2007, 04:10 PM
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If you have the haynes manual just follow it step by step and you will be fine.
Here are some pics from when I did mine, this is how to bleed the system with the engine running.


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post #3 of 11 (permalink) Old 03-16-2007, 04:12 PM
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The drain cock is on the passenger side bottom corner of the radiator facing the firewall.

Bleed it until you have a solid flow of coolant (no air bubbles for at least two minutes)
And yes always use a 50/50 mix of coolant and distilled water.
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post #4 of 11 (permalink) Old 03-16-2007, 04:18 PM Thread Starter
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Thanks, I've read that you should fill the system w/ 100% water, from a hose I assume, then run the engine w/ the heat on high to flush the system.

Then drain, and fill w/ 50% distilled water, 50% coolant.

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post #5 of 11 (permalink) Old 03-22-2007, 06:43 PM Thread Starter
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Can anyone tell me where the drainplugs are located for the cooling system on the engine block?

The Haynes manual says the drainplugs are located behind the exhaust manifolds on each side of the engine block.

I've been under the car looking for them and had no luck. Where exactly are they located? and what do they look like? b/c there is no picture in the Haynes manual.

thanks.

Last edited by mf2004champ; 03-22-2007 at 07:07 PM.
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post #6 of 11 (permalink) Old 03-22-2007, 07:22 PM
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UH as far as I know the only drain plug for the cooling system is the one I already told you about: "The drain cock is on the passenger side bottom corner of the radiator facing the firewall"
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post #7 of 11 (permalink) Old 03-22-2007, 07:34 PM
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what the manual was refering too were freeze plugs and really should never be messed with unless have too or what ever. unless you feel like a lot of work dont even worry about the block.
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post #8 of 11 (permalink) Old 03-22-2007, 10:06 PM Thread Starter
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OK, sounds good gentleman. Couldn't find them anyways. I will be doing the coolant flush tommorrow. Will report back on how it goes.
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post #9 of 11 (permalink) Old 03-25-2007, 06:17 PM Thread Starter
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Completed the drain, flush, and re-fill. Everything went according to plan. The draincock was difficult to get loose, needed plyers, very carefully not to destroy it!

Got most of the coolant out. Surprisingly very clean. Even while flushing, very clean system. Re-filled with 50% NAPA coolant and 50 % distilled water.

The bleed valve was put to use. Wow, now I understand why these engines have it. A ton of air was coming out, until a steady stream started through the tubing. Drove it for a little, next day had to top off the coolant overflow tank to the 'cold fill line.'

I wish I did this at the beginning of winter, b/c my heater can really crank now. There is a noticable difference in the temp. of the air. It probably could be b/c it is now 50% water, not 100% coolant.
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post #10 of 11 (permalink) Old 03-25-2007, 06:23 PM
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I know my heater blow really hot, and it almost feel as if my feet get burned on floor mode
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post #11 of 11 (permalink) Old 03-28-2007, 02:27 PM Thread Starter
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Anybody else have problems with the coolant tank 'fogging' up which makes it difficult to see the 'cold fill level?'

Also, I noticed that the coolant tank has dividers in it, and wondering if you need to top it off until the outside sections fill? damn chrysler w/ their 'fogging' issues!

thanks.
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