Hi all, it has been a while since I have posted. Life has been busy and fixing stuff on my WRX has drained my wallet! Now though, a new problem has risen.
Prior knowledge about my car: Has Forge BPV, Cobb SF Intake, Invidia dp to custom catback, Cobb Stage 2 91 Tune, and I replaced the malfunctioning stock rad with a Mishimoto aluminum one and replaced the rad hoses. The car ran fine and stayed cool after I did the rad job. Also, my AC idler broke and I removed the belt and all and have just been going sans AC all summer as I am poor and it needs a recharge anyways.
The issue: This summer, I have noticed my car doing weird things. When I drive at steady RPM, whether in town or on the highway, I will often watch my temp gauge start to climb. I monitor coolant temp on my Accessport and it usually is at around 200 Degrees Fahrenheit, and the fans cut in somewhere shortly after 200. It stays cool no matter how hard I drive it until I stay at steady RPM. It climbs to 208 then quickly climbs to around 135-138 then as soon as I downshift or apply throttle, it stays for a couple seconds and goes back down. When the temp does climb, my heater still blows hot air. I also have not noticed coolant or bubbles in my oil and my car hasn't blown white/blue smoke from what I have seen. So I'm not thinking head gasket. It also warms up about the same as it did before which makes me believe it isn't a thermostat. Maybe a water pump issue? My accessport reads the same as my temp gauge so I doubt the gauge is faulty. I am stumped. I burped the system properly when I installed the rad and it worked perfect until now. My girlfriend's father is a seasoned mechanic and said it sounds like it could be head gasket but my heater works when it gets hot so that wouldn't make sense. He also saw that my AC condenser has mostly bent fins and could be blocking air to pass through and the fans aren't pulling enough through but that would not explain why it only overheats at steady RPM even on the highway.
Sorry for the word fortress, just giving as much info as possible. PLEASE HELP ME!