# Overheat **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** toyota, 4runner\ **Created:** [July 5, 2010, 7:44pm UTC](https://community.cartalk.com/t/overheat/51337 "2010-07-05T19:44:05Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![phelon2](https://avatars.discourse-cdn.com/v4/letter/p/77aa72/32.png) [@phelon2](https://community.cartalk.com/u/phelon2)\ **Post date:** [July 5, 2010, 7:44pm UTC](https://community.cartalk.com/t/overheat/51337/1 "2010-07-05T19:44:05Z")
My 2002 4 runner with only 63,ooo miles overheats when it gets hot and I have to sit in traffic. Sometimes it takes a long while, sometimes it happens in just 15 minutes. Faster with the ac on. 1 - Coolant good, changed at 50,000-- no fulid loss 2 - good fluid flow 3 - no obvious bebris clogging condenser or radiator coils My thinking is that I either have a bad fan clutch, or the radiator coils need to be cleaned. I have some AC mechanic coil cleaning chemical that will clean them so good they’ll shine. Spray on , let sit 10 minutes and pressure wash off. If this does not do the trick, how the heck do you test a fan clutch? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [July 5, 2010, 9:06pm UTC](https://community.cartalk.com/t/overheat/51337/2 "2010-07-05T21:06:33Z")
With engine hot, turn the engine off, open the hood and try spinning the fan by hand. If the fan spins the fan clutch is defective. Tester ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [July 5, 2010, 11:11pm UTC](https://community.cartalk.com/t/overheat/51337/3 "2010-07-05T23:11:27Z")
A pressure test of the coolant system and radiator cap may reveal issues.