Question about 1990 Ford Bronco

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My 90 ford bronco over heats and it blows out the over flow.top hose is very hot.

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There are mulitiple possibilites here. Assuming there are no other major problems with the engine, and that this happens only from time to time the first thing to check is the thermostat. Ensure it functions correctly and is the correct heat range (ie: 160, 170, 180, 190, 200 and 210 degrees are the normal raanges used) Use the recommended t-stat for your vehicle (including all optional equipment). Also check the water pump for any noise or grinding to ensure it is functioning well. Next thing to check is that your fan is the correct fan and not modified or replaced with a smaller one or electric fan. The air shroud is also very important to direct air flow, and believe it or not it, that plastic shroud everyone hates will help to significantly change the airflow and thus cool much better. These are the most likely caauses. Keep in mind that the overflow only happens when sigificant pressure takes place from the coolant overheating and expanding... it does not always mean you have too much fluid. Also keep in mind that coolant has a higher boiling temperaature and does not expand as quickly as water... that is why you should always be using coolant and not water. Water works in an emergency, but not good for much more than that. The last thing I suggest you check is the size of the radiator... if it was replaced before or if you have modified the vehicle (towing, etc.) the radiator should be resized to accomodate the new load. The normal radiator for this vehicle has hat is called a "2 core" radiator. You may need a "3 core" radiator for the added cooling surface area... most commonly used for work trucks, towing packages or modified vehicles. This small problem can become a very big one if you do not solve it... the overheating can easily cause cracking in the heads or block later if it continues for any period of time.
1- coolant and levels
2- thermostat
3- water pump
4- fan and fan shroud
5- correct radiator for your application

Posted on Sep 13, 2010

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