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Old 06-11-2007, 12:18 PM   #1
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I have an Onan HDKAK 8.0 KW generator. I changed the oil and filter--no problem. Then I drained the coolant out of the bottom plug. I let it cool down (so the thermostat closed as a result) the coolant ahead of the thermostat would not drain. So I bought a hook-up to fill the bottom back with water again. By the time I get ready to put in new stuff the thermostat closed again. How can I get the darn thing to stay open? I hate to run it without any water in it. Suggestions. Cummins was no help, they referred me to a regional center where they do the repair. s/Toby
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Old 06-11-2007, 12:18 PM   #2
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I have an Onan HDKAK 8.0 KW generator. I changed the oil and filter--no problem. Then I drained the coolant out of the bottom plug. I let it cool down (so the thermostat closed as a result) the coolant ahead of the thermostat would not drain. So I bought a hook-up to fill the bottom back with water again. By the time I get ready to put in new stuff the thermostat closed again. How can I get the darn thing to stay open? I hate to run it without any water in it. Suggestions. Cummins was no help, they referred me to a regional center where they do the repair. s/Toby
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Old 06-11-2007, 02:39 PM   #3
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i have the onan 7.5 dkd and it has 2 drains for the antifreeze. one at the bottom of the radiator and one in the side of the block. it is always drained cool and there is no problem refilling the radiator and block with antifreeze when the thermostat is closed. i cant understand why your refill is such a problem??
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Old 06-12-2007, 12:27 AM   #4
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Be sure to remove the service plate on top and get to the fill hose behind it. If you only put antifreeze in the resevoir you cannot fill it. The hose will pull out 6" or so.
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Old 06-12-2007, 07:13 AM   #5
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Thanks Tommy and Mike.

Where's my (stupid) sign. I think I am real close to the DWs taking away my workers licenses. I have already lost my ladder and chainsaw licenses previously on other work projects. Maybe I can blame it on my age and lack of grey matter.

You are right Mike, I did not take my glasses with me so I was filling up the overflow tank. I found the plate and pulled out the filler cap and filled it with cleaner and water. Letting it cool down now. Again thanks and wish me well on keeping my workers licenses. s/Toby
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