Thank you for your kind feedback! It's little shortcuts like this that make a mechanics life a lot easier. May I ask since you're planning on reusing and filtering the old coolant; why bother flushing the whole system in the first place?

@@BernardBerdon I will be replacing a water pump which has gone bad. I will filter the "old coolant" for contaminating particulate from the water pump. I hate to sound cheap, I never really am, but the coolant is only 18 months old and has maybe 7000 miles on it and looks perfect, so maybe I am wrong to reuse it? I don't want to be "penny wise and pound foolish", but I also don't wish to throw money away. What do you think?

@@istvanmeissler2238 If you plan on replacing the water pump most of the coolant will spill out anyway. I will also point out that my method in the video works only if you simultaneously ADD the exact amount that is going out of the system so that it never ever runs dry and the expansion tank is always full(That is futile as you are replacing your water pump). Now if you plan to just disconnect the return hose run the truck and "bleed" the system that way you are going to have a very bad day as there are going to be pockets of air while the engine is running so it will overheat + you will destroy the thermostat and water pump and god knows what else. Best way to replace the water pump: 1.Under the radiator on the passenger side there is a valve that you open and let the coolant flow in a clean bucket(if you want to reuse it). 2.Oped the expansion tank so that you drain most of the fluid 3.Remove and replace the water pump + thermostat(while you are going trough all this trouble might ass well do it) 4.When everything is installed and closed tight start adding coolant until the expansion tank is full and doesn't absorb anymore coolant into the system. 5.Turn the ignition key to position 2( there is an auxiliary electrical water pump that will circulate the coolant and get rid of air pockets). 6. While ignition in position 2 add coolant to expansion tank. 7. Start the truck and add more coolant if needed. 8. Keep the heat on high. 9. Go for a test drive and monitor the temperature gauge. As for the old coolant. If its really clean like new and you are extremely thorough that you don't contaminate it; I see no real problem. However you cannot and will not make a mistake by changing out any fluid in the truck with a brand new quality one (whether it be engine oil, transmission fluid, differential fluid, transfer box fluid,..). There is no such thing as changing any fluid to often; only too rarely. I work at a specialist Mercedes-Benz Workshop so I have access to every kind of information on servicing and maintaining those vehicles trough WIS/ASRA +EPC EWA. + I can get you real oem parts or equivalent aftermarket quality ones at dirt cheap prices. Feel free to ask me any questions. Have a great day!

@@BernardBerdon Thank you for your reply and all the information you gave me. I am doing the job today (Sunday) and will follow your advise and do as you recommend. Best wishes to you friend from Northern Michigan.

Hello there, I am very sorry I somehow missed your comment. Yes I can gladly get you parts and tools, since I work at a MB workshop. If you need anything just shout out🙂

​@@BernardBerdon where are you located?

​@@osmaks1518Europe, Slovenia. I also ship regularly to the US

@@BernardBerdon how can i get in touch, you have email or something?

@@BernardBerdon how can I get in touch with you? Email or something?

Correct. Very good observation, I completely forgot to mention it. Thank you for commenting!

@@BernardBerdon thanks for the response. I will be using this method to flush and change fluid this weekend. Appreciate the tutorial.

I am very glad this video helped you out. Well I dont have the exact measurement for the hose... But any size just to fit it snug over the one on the vehicle and clamp it down lightly. It doesnt have any real pressure so you just basically have to "funnel" it down in the bucket somehow.

@@BernardBerdon Thanks again, actually I can measure outside diameter of the return hose and choose the hose from there. There is no such simple and effective tutorial of changing coolant on youtube. I wish you could do more such videos.

@@Ravenola Well I just might do it. Since I did the video(was very young and inexperienced) I became a certified MB technician and am currently MB workshop manager( huuraaay - it means much less time for diy videos).. But yes I do have a lot of tips and tricks up my sleeve so some new videos are in order. Stay tuned and have a good one!

You can do it either way; just be quick so you dont loose too much coolant in the expansion tank. Best option is to turn off the engine.

@@BernardBerdon Thank you indeed !! great video !

@@BernardBerdon Hello again,today i have changed coolant with this method, but blend actuator was stuck in cool position (( So i couldnt have open the fan for full blast in order to change the heater core ((( is this ok or shoud i repeat the change process ? How many liters heater core takes ?

@@havenoname123 I think youre ok. Most of the coolant was replaced so no need to worry. Was the temperature on hot inside the cabin?

@@BernardBerdon I dont remember exactly because i changed the position left and right so many times for heater core replacement......(( is that possible that i not completely changed the coolant , but just 50 percent?

Did you disconnect the hose with the engine running? That might be the cause.

@@BernardBerdon nope! it was hot tho

@@yoodledooter94 did you disconnect the return hose? Yes the engine being hot could very well cause that. Leave it to rest for a couple of hours before you start working.

@@BernardBerdon yes when i disconnected the return hose hot coolant started comin out, i was like oop i thought i did this right. i will leave it to rest. is it normal for coolant to come out while disconnecting the return hose? i thought i was supposed to do that and connect it to another hose i just didnt expeect coolant to be coming out

@@yoodledooter94 No if you disconnected the drivers side hose there shoudnt be any pressure there (except maybe the engine being very hot). So it shouldnt do that when mild warm or cold. Keep me posted😁