I have a 2000 ford expedition, put on a new water pump & thermostat, still not getting hot enough. What can we do
Have you checked the gauge sender or the gauge itself? usually if an engine is running too cold for an extended period it will turn on the check engine light and have a code for engine not up to operational temps. If you have access to a scan tool it can tell you the actual temp of the engine as it is running, so that way you know if it is a sender or gauge problem and not an engine cooling problem.
When you replaced the thermostat did you burp the system to make sure you got all the air out of it and you can go with a higher temp thermostat If you live in colder climates.have or the other trick if the heater isn't working well is to block off a portion of radiator with a piece of cardboard to help raise temp when it's cold out I live in AZ so the summer is brutal so I can it a cool as possible the trade of is the heater is a little weak during the winter hence the piece of card board
Possible plugged heater core, I had to backflush mine.
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