kimcrwbr1
New member
- Joined
- Dec 6, 2009
- Messages
- 31
- Reaction score
- 4
- Points
- 0
- Location
- maplevalley WA
- Vehicle Year
- 1983
- Vehicle
- ford
- Engine Size
- 2.8l
Actually the thermostat performs two functions it allows the engine to reach operating temperature and it also restricts coolant flow through through the radiator for a heat exchange to take place. If it takes a long time for the engine to heat up the thermostat is likely to be stuck fully open. It dont matter how big a radiator is if the coolant is flowing too fast through it you will get a constant rise in temp especially with reduced air flow through the radiator. My 2.8 would overheat constantly even after a complete system, radiator, thermostat, water pump. What finally cured the problem was a good engine flush. I pulled the pump and thermostat and blasted the block out good with high pressure water it was amazing how much crap came out and have never had any problems even on the hottest days. The heater works faster and the temp stays more constant. Also check the bypass ports and clean them good my theory is if the bypass and block are good and clean the water pump circulates the coolant fast inside the block keeping it all the same temp and when the thermostat opens up the cool mixes better with the hot and your not gettin alot of extremes and the thermostat finds a balance point. The coolant will follow the easiest path so if the bypass is restricted the cool coolant is not allowed to circulate properly in the engine. In general if the engine is overheating check the temp of the lower radiator hose if it is cool the thermostat is likely stuck closed, if the hose is real hot the thermostat is stuck open or the radiator is plugged look for cold spots on the radiator. In my opinion you cant have too much radiator you just need to schroud it properly so the fan is pulling air through the entire area and the fan is moving enough cfm`s to transfer the heat. Thats the first time I have heard of a two speed fan maybe you could wire it to 4 low so it automatically turns on high when your wheelin. It`s monday so far the boss hasen`t called so I thought I would stir the pot