Direction of coolant flow - Mitsubishi-Forums.com
 
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post #1 of 17 (permalink) Old 02-03-2018, 10:30 AM Thread Starter
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Direction of coolant flow

I recently bought an '05 Montero and I'm trying to figure out the direction of the coolant flow. I've taken it to a few local shops and some say it flows from the bottom of the radiator to the top and others say from the top of the radiator to the bottom. I've phoned six or eight dealerships to determine the direction of coolant flow and most of them don't know. I've googled the coolant flow direction and there does not seem to be any information available. What do the Montero owners think? Which way is the coolant flowing?

Thanks
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post #2 of 17 (permalink) Old 02-03-2018, 11:10 AM
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Hi rcan1015....may I know why you need to determine the flow direction?
As far as I know...coolant flows from the top of the radiator going to the engine then goes back to radiator from below. Let’s wait for others to chime in....
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post #3 of 17 (permalink) Old 02-03-2018, 12:42 PM Thread Starter
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Hello Carlsson. I don't have much heat from the front heater core and I took the Montero to a quick oil change shop to have a chemical flush of the cooling system. The instructions on the Blue Devil Radiator flush container said to drain the coolant, then fill the system with water and idle for 10 minutes. Then drain the system again and refill with water and the BD Radiator flush. The quick oil change shop used a machine that was suppose to flush the coolant and replace it with water. It is a pressurized system that they said it would create a much more thorough flush and remove all the existing coolant. After they hooked up the machine, it took about 30 minutes for the flush. As I mentioned in the first post, nobody at the various dealerships seems to know for certain which way the coolant is flowing. So I asked the techs at the quick oil change if the coolant flow direction matters for their machine. Since the pressure was suppose to force the thermostat to open, I figure it makes a big difference if they connect their machine to the wrong radiator hose. I mean how can it force water through the thermostat if it is going in the opposite direction of the actual coolant flow direction. Doesn't the thermostat just open in one direction?

Thanks,
Richard
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post #4 of 17 (permalink) Old 02-04-2018, 11:55 AM
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The thermostat will open at a given temperature..if it does,water will flow freely regardless of direction. I looked online and it seems water from the radiator goes to the engine from the bottom hose then goes back to the radiator using the top hose..
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post #5 of 17 (permalink) Old 02-04-2018, 03:10 PM Thread Starter
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It's true--after the thermostat opens. But if the thermostat is closed, which I assume happens when they start flushing the system with cold water, then it seems that the way that the quick lube group hooked up their pressure machine would be important. If the thermostat is closed and they introduce pressurized water from the wrong direction, the only way the water would circulate is through the weep hole.

I also looked online several times, but there is no agreement on the flow of coolant in the Montero. Folks on another Montero forum stated that the flow goes from the water pump to the lower radiator hose and out through the top. It is amusing and confusing that nobody seems to know for certain and there is a lot of disagreement.
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post #6 of 17 (permalink) Old 02-05-2018, 11:21 AM
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If the flush took 30 mins then I would assume the thermostat opened...If it didn't,will the flushing machine they used be able to open the thermostat by just pressure? If the water flow is wrong,then the thermostat won’t open as it only opens in one direction. I guess the sure thing way is to remove the thermostat when using the flushing machine.
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post #7 of 17 (permalink) Old 02-05-2018, 12:04 PM Thread Starter
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I guess it doesn't matter anymore--I took the Montero back to the quick lube shop and they flushed the Blue Devil and replaced it with anti-freeze. I feel like you are probably correct, even though it took 30 minutes to flush, it probably was going the right direction. Or else the first flush would have taken a lot longer if it was just going through the weep hole. Anyway, I still don't have much heat so I guess the flush didn't work. Got to decide if it is worth paying big bucks to replace the heater cores or to just sell it and look for a 4Runner!
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post #8 of 17 (permalink) Old 02-05-2018, 01:04 PM
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Where are you located? Here in LA....i wouldn’t mind wearing a jacket while driving if my car doesn’t have heat...considering it hasn't been really cold this winter...🙂 The thought of replacing the heater core scares me...a lot of stuff and a lot of screws to be removed making you wonder if they will ever be put back the right way......creating rattles in the dash.
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post #9 of 17 (permalink) Old 02-05-2018, 06:54 PM Thread Starter
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That was my feeling also--replacing the core is beyond my limited scope. But I also don't want to pay somebody that might not put everything back right and then I'll have annoying rattles and squeaks. The fit of the dash looks great now and I'm not sure it's worth paying $1000 for more heat. The seats heat just fine and I do get some heat from the vents.

I'm about 850 miles north of you--Eugene, OR. I could send some photos if you are really interested!
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post #10 of 17 (permalink) Old 02-06-2018, 11:02 AM
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The montero’s interior is a bit noisy as it is....rattles and all. It doesn’t need new rattles and squeeks to appear after a heater core install. Haha.

Not into buying a montero right now....but I wouldn’t mind replacing my ‘01 with something newer. What’s the mileage on yours?

Last edited by carlsson; 02-06-2018 at 11:04 AM.
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post #11 of 17 (permalink) Old 02-06-2018, 09:12 PM Thread Starter
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I bought it last year with 166K miles. In September, 2017 the previous owner had the engine rebuilt (provided paperwork that I verified) and replaced timing belt, water pump and radiator. After I bought it, I put on new Kumho radials and front brake calipers. It really runs nice and looks great--but I can't drive in the mountains in Oregon without heat. The shop wanted $1200 to replace the heater core. I listed it on Craigslist a few days ago. You can go to craigslist for Eugene and search for it. It is the only '05 listed (at least today). It probably won't sell (not very popular) and maybe this summer I'll feel like keeping it! The AC works great.
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post #12 of 17 (permalink) Old 02-07-2018, 10:19 AM
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Saw it. Looks really nice and clean..just keep it. 🙂
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post #13 of 17 (permalink) Old 07-27-2019, 11:55 PM
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When I went to the shop to ask em to flush my heater core i got laughed at. They said they are mechanics for 20 years and never did that and gave me a quote for heater core replacement something around $1000 part + labor. I went to a few stores to buy some supplies and did a proper flush in my garage. Less than $100 in parts + a few hours of work. Heater works again like brand new. Six months no issues so far. Who is laughing now?
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post #14 of 17 (permalink) Old 07-28-2019, 10:52 AM Thread Starter
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After a couple of months without heat, I found instructions (from a Montero owner in Australia) that showed step-by-step process for removing the front heater core. I spent several hours and removed the center console and dash and then drove it a couple of miles to some mechanic friends. They installed the new heater core and burped the system. I re-installed the dash and had a total of $300 invested (plus a lot of time) for a new heater core (other shops wanted $1500 to do the entire job). Anyway, I had great heat for a month and then it went away. Got pissed and sold the Montero. I'm very pleased with my 2005 4Runner!
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post #15 of 17 (permalink) Old 07-28-2019, 03:16 PM
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The problem is that the entire system was contaminated not just the heater core. By just flushing or replacing heater core only the problem doesn't get solved but rather delayed. When HC becomes so clogged that also means that your radiator is heavily clogged as well. On a picture you can see my old OEM radiator with 200K miles on it. I was shocked when I opened it and couldn't believe the car wasn't overheating. Radiator is not very expensive to replace btw. Anyway I also decided to replace all possible hoses and in fact did heater core reroute by disconnecting rear heater core (don't need it at all) and deleting all pipes and hoses for front and rear heater core. I connected front heater core directly to engine with semi custom hoses I made up. So heater core flush+new radiator+engine flush+new rerouted hoses. System is pristine clean.

P.S:Had two 3rd gen 4runners good cars. 1 with rear locker no electronics, the other with "traction control" but no locker. Lack of space was the biggest concern for me and rear drums didn't feel confident on longer downhills. Almost crashed once when brakes overheated lol. Had to let them both go.
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post #16 of 17 (permalink) Old 07-28-2019, 04:19 PM Thread Starter
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After the first complete flush at the radiator shop, I replaced the radiator (since they said I had reduced flow). I had already replaced the thermostat twice. So, after replacing thermostat, radiator, hoses and heater core, I still did not have much heat. After taking the vehicle to several repair shops, the only thing that was agreed upon was that the water temperature never got very hot. I started thinking that whoever rebuilt the engine messed up somewhere and that it would come back and haunt me. I really liked that Montero and in many ways think it is superior to my 4th gen 4Runner. But, now I have heat and many more choices for aftermarket parts (as well as OEM parts that are getting hard to locate for Monteros).
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post #17 of 17 (permalink) Old 07-28-2019, 11:30 PM
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Gotcha. Yeah parts market is poor for monteros
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