98 S10 2.2 runs hot with AC on

[NJBOB]

Hi, My 98 S10 2.2 automatic with 200K runs hot with the AC on. I have had the clutch fan replaced and a new tstat put in. Without the AC on, in hot weather it does creep up slightly. If I am moving fast it is not as bad as when I am stuck in traffic. I guess my question is this. Should I try to flush the radiator first? Or should I just replace the radiator. Or is it possible it could be something else. I would hate to go through the process of radiator replacement and have it not be that. And how difficult is it to do? Sure looks tight in there. Thanks Bob

[OverBoardProject]

Try flushing the rad with a prestone kit, plus even more important you probably have a lot of dirt built up between the 2 rads. The only way to clean it is to basicly take the rad out (although you might be able to tilt it enough) and to spray then both clean one at a time.

Don't be suprised if you need to use some de-greaser and a presure washer will make the job easier.

[NJBOB]

Thanks, I will give that a try. I am a bit afraid of hitting it with a pressure washer but I am sure after so many miles there is crud in there.

[OverBoardProject]

Then use the degreaser and a garden hose

[mike1224]

how hot do you mean? when doing some driving i'll hit about 230-235 but thats with A/C blasting. and in 90+ degree weather.

[jimmyv-21]

if you have never replaced the coolant, now would be a great time. you dont necessarily have to do a flush due to the high mileage/ potential for leaks, but a drain and fill would probably work wonders. coolant has a life expectancy just like everything else, and it breaks down over time. when i did mine i also replaced the t-stat and the coolant temperature senser- like 10 bucks for the sensor.