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Heater Help
Searched "heater" in this forum and could not come up with anything relating to my specific issue. Any help would be greatly appreciated.
1987 V10 with 5.3/4L60E
new thermostat, coolant level is good, heater hoses hot
blower motor has all four speeds, truck will heat with fan on low but not when fan speed is on high. Any suggestions?
Thanks in advance
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