Flushed my radiator yesterday so now I am wondering if it would be a good idea to back flush the heater core, it is not clogged but I'm sure it could use a good flush. I know they're not built to handle more then 10 or so PSI so I'll keep that in mind, but in terms of loosening gunk a debris Is there a chance I could cause more damage than good by doing the flush, I'll leave it alone if so, also where are the 2 hoses located in the engine compartment. Thanks guys.

 

The heater hoses are located on the firewall on the passenger side. They have two quick connect fittings. you press on the fittings so the clips disengage and then pull them straight off. you should not have to pull them real hard. When you put them back, you put all the pieces together and just push them on the inlet and outlet pipes of the heater core. i put a little grease on the pipes so they slip on easier.

you should not hurt the heater core by flushing it out. if you do, it will have already had a leak that was only being sealed by the gunk and crud in your heater core.

Two things to watch out for.

if you break the plastic clips on the quick disconnect fittings you will need to install new heater hoses. The plastic breaks easily when it is old and the fittings can crack when you take them off. if they are cracked, they will most likely leak even if it is a small amount, new heater hoses cost about $30 each

Forcing the hoses off or on can create a leak in your heater core. look on line for the quick disconnect fittings and see where you press on them so they will come off easily without breaking the heater core.

last; if the heater is putting out good heat and not leaking, i would not try to fix it. if your coolant is clean and you did not use tap water, this alone will most likely keep the heater core clean.

 

thank you!