I guess that the heater core in my 86 740 Turbo wagon is leaking cause I have antifreeze on the front floor.Heater Core for air conditioned cars Is this as nasty a job as it looks?

Response: Try to find out where the coolant is coming from. Usually if the core goes bad you get a coolant mist on the windshield with the defrosters on and you can get some coolant drainage from the A/C condensate line or onto the carpets. As a temporary fix, you can add a stop leak additive to the cooling system.

But plan on a new core soon. Editor Note that air conditioned cars do not have hoses or a water valve inside the passenger compartment. Cars with heater only have a water valve on the left side of the console against the firewall inside the passenger compartment and this can leak, appearing as though the core is leaking.

Heater Core Replacement: See the separate FAQ file which explains the replacement procedure for the Manual Climate Control-equipped car. ACC and ECC are similar. Tips from Bob I have done 2 heater cores on 700 series cars.

It is very labor intensive. You have to take apart the lower half of the dash and partially disassemble the heater case. The ... more.

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