Got a buddy who's having overheating issues with this 94 Toyota Corolla. He says he doesn't see any leaks in the hoses and the reservoir isn't cracked. Any other ideas?

Asked by Aug 10, 2016 at 05:07 PM about the 1994 Toyota Corolla Base

Question type: Maintenance & Repair

Car's overheating, but it sometimes cools off, then goes right back up when
sitting or being driven. What could be causing this? It sounds like a thermostat
issue to me, but I want to give him good advice. Help?

2 Answers

18,190

That is where I would start first but also can be a number of things that can cause overheating. Cooling fan or fans not coming on, clogged radiator, bad water pump, clogged cooling ports in engine block, start with replacing thermostat first.

825

Remember the basics. Proper mix of antifreeze and distilled water please, Make sure that the cap is good as well, have it tested if it is the pressure type. Make sure that the belt driving the water pump and radiator fan (if applicable) is the proper tension. Make sure that thermostat is a genuine toyota part of the correct heat range. If you notice white buildup (calcium deposits caused by using non distilled tap water) then you can take radiator to shop and they can clean it, or you can find a pretty decent one brand new on line. Hope this helps.

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