Heater Core Check Procedure
On all the other cars i've owned and serviced at my shop, i've always checked the heater hoses. There will be one in and one out. If one is firm and the other isn't while the heat is commanded on, youve got a clogged heatercore.
thats the first and most times easiest check. After that, in my chevy's i always take the control panel off and check the wiring pigtails to see which ones have shorted out (usually just behind the switch). Thats chevy, but an easy check also.
After the easy checks, you'll want to check the valves which, on my mitsubishi's have been inline with the heater hoses. you may need an volt/ohm meter and the appropriate values for a functioning valve. it could also be a physical deficiency. you can take the valves out of the car and check them too.
Let me know how you make out!
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