Ive had an issue with the temperature of my 1987 MM 2.6 4x4 ever since I bought it. Its never gotten up to temperature (between cold and hot) even on hot days. my thermostat is good. I do have a bad heater core but that shouldn't affect the rest of the coolant system. It recently snowed here in north Carolina so I decided to go out and tinker with it. I took cardboard and put it in front of the radiator and low and behold, the truck got up to temp ( had to dog it though) anyone have any idea why it runs cold constantly? btw it doesn't have anything for a/c. previous owner took everything off except whats under the dash the compressor (removed it myself to free up space)
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