rustykramermetalfab Posted August 3, 2023 Share Posted August 3, 2023 I am ready to fill my system with water for the first flush after changing all hoses in the engine bay. I have the dash heat on and read to turn on the AH engine pre heat if I have it. Well I have it, so my question is does the AH need to be running on diesel for the pre heat to circulate. I would think it would need to be up to temp before it would circulate but just checking since I do not have any experience with AH engine pre heat. 2006 Dynasty ISL 400. Aqua Hot model AHE-100 04S I will be installing new thermostat. Link to comment Share on other sites More sharing options...
Dr4Film Posted August 3, 2023 Share Posted August 3, 2023 Nope, the AH engine pre-heat loop has its own pump to circulate the engine coolant through the loop inside the AH boiler fluid. Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 3, 2023 Author Share Posted August 3, 2023 Just now, Dr4Film said: Nope, the AH engine pre-heat loop has its own pump to circulate the engine coolant through the loop inside the AH boiler fluid. OK thanks for the information, Doc so it will circulate with the switch but just not be warm unless the AH is running. Link to comment Share on other sites More sharing options...
waterskier_1 Posted August 3, 2023 Share Posted August 3, 2023 In addition, when you do not have the Aquahot PreHeat turned on (which is designed for the Aquahot boiler to heat the main engine coolant via a heat exchanger) there is coolant flowing when the main engine is running, being pumped my the main engine water pump. So, when the engine is running, coolant is being circulated through the PreHeat heat exchanger. You don't want to have the main engine running and the PreHeat on at the same time. The problem is that the main engine water pump can somehow damage the PreHeat circulation pump if it is on. -Rick N. Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 3, 2023 Author Share Posted August 3, 2023 20 minutes ago, waterskier_1 said: In addition, when you do not have the Aquahot PreHeat turned on (which is designed for the Aquahot boiler to heat the main engine coolant via a heat exchanger) there is coolant flowing when the main engine is running, being pumped my the main engine water pump. So, when the engine is running, coolant is being circulated through the PreHeat heat exchanger. You don't want to have the main engine running and the PreHeat on at the same time. The problem is that the main engine water pump can somehow damage the PreHeat circulation pump if it is on. -Rick N. Oh wow thank you Rick! not going to do that! Link to comment Share on other sites More sharing options...
Georgia Mike Posted August 3, 2023 Share Posted August 3, 2023 I changed all the main radiator hose’s about year or so ago and used this vacuum system to fill it back up. It worked fantastic and it eliminates air pockets in the cooling system. I had a big 5 gallon bucket and kept filling it as it was sucking the coolant back in. This way your sure coolant gets to all those hard to get areas of the system. I think I put in about 12 gallons you can’t get it all out. 1 Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 4, 2023 Author Share Posted August 4, 2023 15 hours ago, Georgia Mike said: I changed all the main radiator hose’s about year or so ago and used this vacuum system to fill it back up. It worked fantastic and it eliminates air pockets in the cooling system. I had a big 5 gallon bucket and kept filling it as it was sucking the coolant back in. This way your sure coolant gets to all those hard to get areas of the system. I think I put in about 12 gallons you can’t get it all out. I have a similar system to Mikes vacuum deal, called Air lift. I think it was $140.00ish. I did the first water fill and flush and it worked awesome. I will also say that the C-Low Fab aluminum expansion tank is worth changing out to. My hoses were all junk. My small hoses all crack when bent so don't overlook those. Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 6, 2023 Author Share Posted August 6, 2023 Can anyone advise how many flushes of their cooling system they are doing to obtain clear or near clear water? I have been running the coach with the dash heat on. I have flushed 6 times, coolant color is still in the water after draining. Still looks like a heavy concentrate to me. Any thoughts? 400 ISL Link to comment Share on other sites More sharing options...
Ivan K Posted August 6, 2023 Share Posted August 6, 2023 All the way to thermostat opening temp? I needed only 2 with ISM. From green to clear. Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 6, 2023 Author Share Posted August 6, 2023 No I removed the Stat to do the flush based on info I read on IRV2. Link to comment Share on other sites More sharing options...
Ivan K Posted August 6, 2023 Share Posted August 6, 2023 2 minutes ago, rustykramermetalfab said: No I removed the Stat to do the flush based on info I read on IRV2. Yes, that's even better so it's just weird then. I don't know an ISL, only one thermostat I suppose? Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 6, 2023 Author Share Posted August 6, 2023 Yea as far as I know only one.... Link to comment Share on other sites More sharing options...
Paul J A Posted August 6, 2023 Share Posted August 6, 2023 On 8/3/2023 at 1:25 PM, waterskier_1 said: In addition, when you do not have the Aquahot PreHeat turned on (which is designed for the Aquahot boiler to heat the main engine coolant via a heat exchanger) there is coolant flowing when the main engine is running, being pumped my the main engine water pump. So, when the engine is running, coolant is being circulated through the PreHeat heat exchanger. You don't want to have the main engine running and the PreHeat on at the same time. The problem is that the main engine water pump can somehow damage the PreHeat circulation pump if it is on. -Rick N. YEP! They fight each other and the engine pump wins. Link to comment Share on other sites More sharing options...
Frank McElroy Posted August 18, 2023 Share Posted August 18, 2023 On an ISL you won't get proper circulation with the thermostat removed. These engine can not be run with a thermostat removed because coolant will not properly flow through the head and block. With the thermostat in place, 2 flushes is all you would need. Link to comment Share on other sites More sharing options...
rustykramermetalfab Posted August 18, 2023 Author Share Posted August 18, 2023 Thanks for the info, everyone. I got it done. Link to comment Share on other sites More sharing options...
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