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First, not a mechanic. Cars baffle and intimidate me, but I'd rather learn something than pay lots of money for someone else to do it... perhaps not a good thing... Looked (researched?) all over the internet. Finally decided to start my own post... Overheating issues - seems to happen mostly when going uphill, but it's been hot lately and has also overheated after a few minutes on the road. Just started maybe a week ago, and progressed quite quickly. Not it'll do it every time. 150k miles (No idea as to the history of the car, but I'm sure the guy who sold it to me was kinda shady, after multiple issues (electrical), I noted that the CEL light should be on... when I looked closer there was some black electrical tape covering the damn thing! Yikes!) T-Stat - Replaced thermostat w OEM from the dealer Radiator Cap - Replaced Radiator Cap with a Cheap-O, but as coolant seems to rise and fall in reservoir, I don't think this would be the issue. Head Gasket - Used a NAPA block test kit, seems okay (liquid stayed blue). No visual signs of leaking head gasket under the engine, that I can tell. Air - I think I've bled the air out properly after t-stat replacement, well enough, I hope. Water Pump - Not sure, I think it's working. If I run it without the radiator cap on, the coolant level rises until the fans cool it back down. The temp seems to cycle normally, if I rev it up to about 2000+ rpm, the lower hose collapses... I'd assume the pump is causing this to vacuum... both upper and lower hose are tight with the cap installed. At idle, fans turn on at 203 F (read live via ECM), cool to about 190 F, and then cycle as such. This will continue if I hold it at about 2500 rpm as well. If I hold it at 3700 (high, I know, well, I think... sounds high), she'll overheat. I hit the red mark at about 235 F... so I stopped at about 225 F Coolant seems to pulsate up and down, as far as flow goes, can't really see it moving in this radiator design... I'm thinking the radiator possibly? Is there something I can do at home that will verify a clogged radiator? Oh ya, just to note, there was only water in it before I replaced the thermo. Thanks for any tips you might have, and for your time as well.