Overheating only while driving why

1998 NISSAN MAXIMA
179,000 MILES
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SEXYINPINKANDBLACK
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Changed radiator cap and.flushed radiator and coolant/anti freeze and only overheated after been driving about 10 miles
Mar 15, 2012 at 5:40 PM
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FIXITMR
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is thermostat good? CHeck out this guide

https://www.2carpros.com/articles/engine-overheating-or-running-hot
Mar 15, 2012 at 6:21 PM
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FIXITMR
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so if it just sits and idles it never gets hot? are radiator fins blocked/dirty?
Mar 15, 2012 at 6:23 PM
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SEXYINPINKANDBLACK
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I have replaced the thermostat and took the radiotor to a radiator shop where it was pressurized because it was partially clogged. i have replaced the radiator cap as well; but it still gets hot. I can drive for about 15-20 mins before it starts getting hot; than the temp goes down for a few mins than the temp starts rising again. But as soon as I stop and leave running the temp goes down. For some reason it only rises while driving and decreases while sitting in drive/idle. Not sure what that can be; any suggestions?
Mar 15, 2012 at 6:33 PM
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FIXITMR
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have you pressure tested system? if you operate heater will that stop overhaeting?
Mar 15, 2012 at 7:27 PM
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