Thank you reading. 3.8, caravan, rear,front heater. Two Questions.

Going to flush system. How man qts does system require since have rear heater? And what should I do about the proper mix since I am thinking like the information written below?

I can't drain all from the block. Therefore if I add the 50/50 mix antifreeze won't it be dilluted down since existing fluid is still in block especially since flushing will add more water to system? This might make it 40%antifreeze.

I don't want to mix 60% antifreeze and 40% water because system will then be filled and I can't dillute it anymore once it is filled.

 

♦ Engine Coolant (3.3L and 3.8L Engines) with Auxiliary HeaterMOPAR® Antifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid Organic Additive Technology)1 Gallon - 05066386AA16.3 Quarts15.4 Liters



Hard to tell how much water will be left in the system after you flush it. I drain the block and radiator, add 1/2 gallon of straight coolant and then fill with 50/50 mix. Run the vehicle and bleed the air (themostat should be open) and then test the coolant strength. If it is weak, drain some out of the radiator and fill with straight coolant.

 

thank you. Bleeding air, does it bleed itself while t-stat is open?

I don't know how you were able to drain the block.

Thank you

 

Wouldn't 1/2 gallon and rest 50/50 make it more then 50/50 antifreeze? I guess thats ok, right.

 

if you flush with water, there will still be straight water in the system after you drain it. So you add straight coolant to mix with that water and then 50/50 from there. Possible it will be weak when you are done so you'd have to drain some and add more straight.

As far as the block drains, good question. I personally haven't removed one on these but best I can tell, it's the allen head plugs in the block on each side. They appear to be a pain to remove.

 

Thanks Tizzy for giving me understanding. i wish i would have learned to be a dodge mechanic earlier in life. I like understanding and thankful for you giving me answers.

I won't try to remove head plugs. I believe i would brake it.

 

Once you have all the old antifreeze out and just a little water in the system and the system holds 16.3 qts, then add 8.15qts of straight antifreeze and then top off with water. You will have a 50/50 mix. (I would actually add 2 gallons and the mix will be close enough to the correct mix.)

Be sure you make the last flush with distilled water and the top off with distilled.

 

How do you flush with distilled water? That's gotta be spendy

 

Thanks for responses. I take off the lower hose from radiator in hope that fluid drains from there. I understand the radiator fluid draining out from there, and the fluid up at the water pump and down through the metal line attaching to the bottom hose.

I don't understand how the fluid drains from the rear heater core and adjoining lines to it because those metal lines eventually must go upward on its route to the engine. That would leave allot of fluid still in system.

Please help me to reconcile this issue.

 

The reason I ask about rear heater is because i would only be able to drain about 13 qts of the fluid because there would still be qts still in rear heater and lines, right. Therefore i don't want to put in 8 qts of antifreeze because that would definitely be more then 50% with the 3 or so qts still in line. What do you think?