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We do see many heater cores get plugged in these cars. Disconnect the hoses from the heater core and GENTLY blow air through the core to dislodge some of the sediments. Flush clean water through the core to flush out any loose sediment. Installing a new thermostat is a good idea. It is also possible that the water pump is not circulating the coolant, but that would normally have other (overheating) symptoms.
162 foot pounds
Your main drive wheel is the right front. If you are heavy on the foot, you will wear the right front tire out significantly quicker than the left front.
I wish that we had a magic answer ball that would help you out. We can give some suggestions based upon the information you can give to us, but would you trust an online resource to diagnois a complex medical issue? You really need to develop a relationship with a local service center to take care of you vehicle needs moving forward.
Do you have power to the fan? If so you likely have a problem with the motor itself.
Do all the pulleys spin freely? It's likely one or more have seized and caused the noise and belt to break.
No you do not need to remove the timing belt. You do need to remove the serpentine belt.
Recommended interval is every 60,000 miles or 48 months, whichever comes first. We would also recommend the water pump, timing belt idler pulleys and timing belt tensioner at this time.
is it leaking from the oil cooler housing and running down the filter?
The fluid is $30 per quart plus an hour in labor to flush. Price sounds correct for that job.