How do I troubleshoot a Toyota 4 Runner that overheats, but not all the time?

Answer by  McCheese (1248)

Old Toyota 4 Runner's are known for this. It sounds like your thermostat is out of whack and needs to be replaced. The problems will become more frequent until you bite the bullet and fix the problem.

Answer by  sanityrose (2664)

Most often, when your Toyota 4 Runner is overheating, but not all the time, your thermostat is going bad. Failure to replace will cause increased overheating and head gasket troubles.

Answer by  philg1961 (347)

Check the radiator coolant level. Check the radiator for excess dust and dirt, or anything that can impede air flow. With the 4 Runner in neutral, rev the engine. If you hear a squealing noise, the belt is slipping. The nest probable cause would be the thermostat.

Answer by  Ultimate (399)

The Problem with the Toyota 4 Runner could be caused by an number of things firstly you should check the inter-cooler / Radiator is not damaged also the Toyota 4 Runner should have ample water, if problems persist contact a mechanic.

Answer by  MrSuperior85 (140)

First you keep watching the level of water in your radiator everyday morning before starting the car if it show low level everyday it means that your radiator or hose pipes have small leakage. you can either go to a pit shop or if can repair yourself by soldering the radiator.

Answer by  shameer (8)

Inorder to troubleshoot Toyota 4 runner,check radiator hoses and drain cock for leaks. Engine is cold, when the coolant level in the radiator is currect level.

Answer by  nt17 (125)

Obtain a do-it-yourfself manual for troubleshooting tips and proecdures. Otherwise take your 4 Runner to a Toyota service shop or a qualified repair business.