I could overheat my '92 CX/B18C1 hybrid just going 85-90 on the highway for long periods of time when the weather was hot (90+ degrees). I put a Civic Fluidyne radiator in and never had another problem.
I personally don't care for lower temperature thermostats and higher pressure radiator caps. They seem like bandaid solutions for a bigger problem, insufficient cooling. One issue I had that I could have addressed and didn't was air going around my radiator. My CX had no A/C and I removed the plastic shroud that blocked that opening. I also had removed the lower splash guard as well. I believe if I had put these back in place, it would have forced more air to go through the radiator and improve it's ability to cool but I never did. My CX rad also had 150k miles on it as well and it was no longer an issue with the Fluidyne. If you don't want to spend the money and do not have A/C, consider installing an Integra radiator. You will have to fabricate some mounts for it but it should provide sufficient cooling for little money. Of course, as mentioned above, also make sure there is no air in the system.
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