Ford Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for asking your question on JustAnswer. 10-20 lbs is normal, based on your description the most common cause is the Heater Core itself there is too much heat loss between the two hoses.
Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Thank you for the reply, no not the blend door, the blend door actuator (very common failure). It could be very possible, that the water pump is not doing the job as well. No thermal coupler.