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2015 Hisun HS700 Crew Running Hot


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I have owned my 2015 Hisun HS700 Crew  for about 3 or 4 months now. I got it used and was supposed to run good but was not put all the back together from a stator upgrade due to previous owner said he was going to out a stereo system on it. Anyway I have worked it much more than I have rode it. I seem to work on it 2 days and ride it for a hour. Me, my wife, and 2 kids (10 and 18) enjoy it but the engine compartment gets so hot. I've replaced the water pump and burped the cooling system and any other thing I could think of to bleed the air out and think its good with no air and water circulating. Fan seems to run fine and be on about all the time. Changed the coolant twice and oil 3 times. I noticed the engine really has nowhere for heat to go because heat rises and no air flow at all. Has anyone had any experience in this area? Any DIY tricks or any advice in removing the heat out of the engine compartment and getting it to a tolerable temperature. Im about to sell it if I can't figure something out and go waste money on a big name brand but I won't have red legs and arm from engine heat burning me and my wife. They machine never acts like its to hot or anything but it feels like it is. Thanks in advance for any and all help. 20210811_061653.thumb.jpg.1e4753e04c21e13ee56f4be4e655e8ea.jpg

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  • Alex changed the title to 2015 Hisun HS700 Crew Running Hot
  • 3 weeks later...
  • 3 weeks later...

I have continued to try and cool this thing down and I'm not having any luck. I can let it run with the radiator cap off and with the front end point up on a steep hillside and burp some air out till I think its gone and completely full. Then go on a 45 mintue ride and without shutting it off when I get back, take the cap back off in same position and get more air out, fill it up with coolant, shut it off to cool over and over. Its is almost unbearable heat. Very unpleasant sitting in the seat and I have placed 2 layers of insulation underneath them and dont seem to cut it anymore? Help!!!! Please!!!!! Head Gasket????

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Sorry, no experience with this model. Looks like back of engine compartment is vented but I can't see the front.  Forced air front to back should help some. Otherwise that engine heat will just hang at the top of the shroud and continue to cook you. Doesn't look like much space for air to circulate to the front of the shroud.  You might try to wire a 12 volt fan into the front of the shroud to constantly force air. I have no idea why your cooling system would continue to build air if there are no leaks. Maybe vacuum test? Best luck to you.

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55 minutes ago, scott ryan said:

Sorry, no experience with this model. Looks like back of engine compartment is vented but I can't see the front.  Forced air front to back should help some. Otherwise that engine heat will just hang at the top of the shroud and continue to cook you. Doesn't look like much space for air to circulate to the front of the shroud.  You might try to wire a 12 volt fan into the front of the shroud to constantly force air. I have no idea why your cooling system would continue to build air if there are no leaks. Maybe vacuum test? Best luck to you.

I appreciate you taking the time to reply and your thoughts. They seem to be about the same as mine. I will try to let you know how it all turns out.

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I think you have the dreaded HISUN leaky head Gasket syndrome.. you get exhaust gases  into the coolant causing a block .. had same issue with my 500.. had to replace gasket and head ........look at the recovery bottle when it gets hot.. you will see tiny bubbles rising while running

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