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Old 03-20-2011, 09:29 PM   #1
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Unhappy 96 panther LC 440 overheating. Help please

Picked up a free non-running sled. Replaced spark plug cables, fuel pump, and fuel lines, and got sled running, but RPMs were sky high.

Took it into the dealer and they put on new throttle cables and everything seemed to be good.

Took it out for a test ride and it started over heating. Fluid levels seemed good. Checked thermostat (works), getting hot fluid to rear heat exchanger, put the sled nose up on a snow bank to try to clear any air bubbles, but it still is overheating before I can get down the street and back.

Any suggestions where I should go from here?

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Old 03-20-2011, 11:28 PM   #2
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Try a different sending unit if you are not sure of the temp. Make sure both exchangers are cooling. Do you have good coolant flow? You may have some veins broke off the water pump. It is not a bad head oring is it?
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Old 03-21-2011, 10:38 AM   #3
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How do your spark plugs look? do they look the same, or different from each other? Do they look like they are running lean?
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Old 03-21-2011, 11:48 AM   #4
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the spark plugs look good. I haven't had time to check the water pump because a friend told me that the water pumps rarely go out and it is placed so that I need to unbolt the engine just to take it off in order to get at the screws. Does anyone know an easier way to check the water pump? I have not checked Orings. I was planing on draining the system in case of blockages since it was sitting for 4 years before I got the machine.
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Old 03-21-2011, 12:15 PM   #5
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You stated that the rear heat exchanger was getting warm. Thats a good indication that your water pump is working. Are you basing the overheating on the idiot light coming on? I believe your sled has posisters. They are little devices that plug into your wiring harness behind the instrument cluster that turns on the indicator lights for a few seconds when you start the sled to show that the bulb is good. One of these could be going bad and giving you a false indication. Your sled should have 2 of them, one for the temp light and one for the oil light. You could try swapping the two with each other to eliminate this as a possible problem.
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Old 03-21-2011, 11:41 PM   #6
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yeah, the idiot light turns on after i ride for a minute but can idle for quite a while without overheating. i will try switching the connections.
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Old 03-22-2011, 10:03 AM   #7
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You should be able to take the cap off and see good coolant flow when it is warmed up.
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Old 03-23-2011, 08:32 PM   #8
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drained the coolant only got and only got out about 1/2 gallon(it was very dirty), then ran water through the system to clean it out. Filled back up with fluid and ran out the air. Didn't seem to overheat, will take out for the real test this weekend.
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