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Ron, ASE Certified Technician
Category: Mercury
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Experience:  ASE Certs and Ford Certs
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1997 Mercury Sable: with no heat coming out of ac.

Resolved Question:

I have a 1997 Mercury Sable wagon with no heat coming out of ac. What could it and about how much it would cost to repair?
Submitted: 5 years ago.
Category: Mercury
Expert:  Ron replied 5 years ago.

HiCustomer

 

Thank you for asking your question on JustAnswer.

The common cause for the heater to produce poor heat in most case is plugging of the heater core.

DUE TO THE INTERNAL DESIGN OF THIS HEATER CORE, REPLACEMENT IS THE ONLY ADVISEABLE WAY TO REPAIR A POOR HEAT CONDITION. Flushing these cores in most cases, IS NOT EFFECTIVE. This concern is caused by a bank to bank coolant flow imbalance. To reduce the imbalance concern, Ford has released a coolant bypass kit to install in the heater hoses. This kit basically contains an H fitting to allow extra coolant to circulate between the heater hoses. The heater core concern is caused by the corrosive nature of the coolant. This corrosion eats away at the metal in the cooling system. We have seen cases where the impellers on water pumps have been eaten away. A majority of this sediment is not removed through normal flushing procedures and with normal vehicle operation will continue to circulate and eventually plug another heater core. It is recommended that the water pump be replaced, a strong chemical flush be used, a heater hose bypass be installed and frost plugs be removed to completely drain the engine block. Run the engine after filling to see if any discoloration is still evident. If discoloration is present, flushing again may be necessary. When complete, replace the heater core and recheck operation. Ford has issued TSB 01-11-6 addressing the bypass kit and flushing procedure. A related document, TSB 01-11-6, is available.

 

The labor on this job can run as high as 6.0 hours and the core usually runs about $79.00. This is a very common concern on the Sable but I would have it checked to be sure before replacing the core.

Customer: replied 5 years ago.
I can hear what sounds like a door openen and closeing behind the rabio console and you get a little heat and then it goes cold is there a control switch back there?
Expert:  Ron replied 5 years ago.
Yes you have a blend door and acuator motor. I would start with checking the heater hoses. If they are both hot then it likely could be a blend door gone bad. If both hose are not hot then suspect a bad heater core as this is the common cause.
Ron, ASE Certified Technician
Category: Mercury
Satisfied Customers: 26859
Experience: ASE Certs and Ford Certs
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