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1969 Cadillac hearse and it is running really warm you replaced the water pump and the thermostat what else could it be?
Wiki User
∙ 16y ago
I had a similar experience with my 68 Fleetwood Series 75 Limo. The problem was a plugged radiator. Cadillac uses a 4-row radiator for these heavy duty vehicles just to keep them from overheating. Before I replaced the radiator, I would make sure the lower radiator hose is not weak. A weak lower hose can "suck closed" starving the water pump for water and resulting in over heating. Make sure the lower hose has a spring in it. This spring is there to prevent the hose from getting sucked closed under normal conditions. There is a powerful suction created by the water pump and can collapse the lower hose without the spring. Baring problems with the hoses (and you have replaced other possible causes), I would suspect the radiator is getting old and plugged up. I did not have any success with radiator cleaning as it was so old and weak, it had to be replaced. Overheating is a thing of the past now.
Wiki User
∙ 16y ago
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