Mike Stager
Dodge Dakota
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7/25/2007
22:39:51
|  RE: Motor Hot - Radiator Cold
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You can check to see if your fan clutch is bad easily. When the truck is cool, and the engine off, rotate the fan by hand, you should feel resistance, but it should turn, but only turn when you are turning it by hand. If you can spin it and it keeps moving after you let go, then you need a new fan clutch. Doesn't happen often, but it does happen.
I agree about the belt too...it may be slipping enough to not turn the water pump fast enough, though less likely.
Hose collapse is caused by suction from the pump, and some sort of blockage or lack of flow behind the collapsed hose. The lower hose is the only hose that really is under any suction stress, which is why ( previously mentioned ) a spiral of wire is inserted into the hose to keep its shape under duress from the water pump.
If you cannot figure out your cooling woes, you may end up having to have the flow of the block and the radiator tested by a competent shop.
The only things that you should have that cause an engine to overheat are:
LACK OF COOLANT
LACK OF COOLANT FLOW
a. malfunctioning water pump ( worn vanes )
b. stuck or improperly installed thermostat
c. blockage ( corrosion build up in water jacket or radiator or collapsed lower radiator hose.
d. air pocket in water jacket from improper filling after service or exhaust intrusion from head/gasket leak
LACK OF COOLING OF COOLANT
a. fan does not pull air through radiator at low speed.
b. blockage of radiator fins
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