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Radiator coolant is only circulating when radiator cap is off
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In accordance with industry accepted best practices we ask that users limit their copy / paste of copyrighted material to the relevant portions of the article you wish to discuss and no more than 50% of the source material, provide a link back to the original article and provide your original comments / criticism in your post with the article.
[quote:DuckNCover:MV8zNTI5Njg3XzYzMDU1MDgxX0M2QTk3MUJB] [quote:BRIEF:MV8zNTI5Njg3XzYzMDU1MDI4XzQ1OUEyMTk0] [quote:DuckNCover:MV8zNTI5Njg3XzYzMDU0OTk2X0Y2QkI4OUIy] I bet you have some scaling in the radiator. That would prevent the correct heat transfer and would make your engine run a little hotter. If this is the case, then use a radiator cleaner and flush it out. Otherwise, there may be a problem with your temperature switch. This sensor sends a signal to your thermostat and could be out of calibration... Also, replace your thermostat. It may be sticking and not fully opening up... It's strange that you should be getting air in the system without losing antifreeze. It could be warped heads, have you checked to see if your oil is milk colored. If so, could be blown head gasket.... Do you have transmission cooler lines or oil cooler lines connected to your radiator. I wonder if you could have an internal leak, in your radiator, between these fluids... [/quote] I think he drained it and changed the AF, that's when the problem began. He's got an air pocket that needs to be purged, thus the bleeder valve he keeps opening and getting air out of. [/quote] This could be, unless he put the wrong AF in it. He may have used that green stuff for older vehicles. If you mix that with Dexcool, it turns to jello.... [/quote]
Original Message
It's a Chevy cavalier 2002, keeps overheating up to 230 degrees. The coolant doesn't seem to circulate when the radiator cap is on, I feel hot and cold spots all over. Any ideas?
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