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Re: coolant not circulating Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Sat, 30 Aug 2008 21:28:24 In Reply to: coolant not circulating, paulcampagna [Profile/Gallery] , Sat, 30 Aug 2008 15:26:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You didn't mention the temperature gauge going into the red. If the coolant wasn't circulating, the engine would overheat in about 10 minutes or less. So I'm going to assume the coolant really is circulating, and the thermostat is opening.
Did anybody bleed the cooling system? I'm not a NG900 expert, but I'll bet the cooling system needs to be bled any time you have it open, such a replacing a hose. The 9000 system self-bleeds, but the OG900 didn't.
Get a big, fat air bubble in the cooling system, and as it warms up and expands, it'll distend hoses. And when it gets trapped in the heater core - the highest part of the system - you get no heat.
Now, if the temperature gauge is racing into the red in a few minutes, the coolant really isn't circulating, and I'd suspect a blockage or a bad water pump. If the engine overheats after about 15 minutes of operation, then the thermostat is sticking closed - but that can just be a bad thermostat - they have moving parts and do fail. There is no connection between the ACC and the thermostat other than they're both in the car. The thermostat is a purely mechanical device.
But if the car isn't overheating, you've got air in the system.
posted by 76.196.10...
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