heater come on at certain temps.

mk3concepts

1j on the way!
Apr 2, 2006
268
0
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Bay Area, Une Town
ok so like the tittle says..heater system only comes on at certain temperatures..like 70? or 72? well random temps...what would be causing this problem? if i press the Low or medium it only comes on at certain temps and sometime wont come on at all..would it be a wiring problem?

when i press the high it comes on but it just blows air..not cold or warm

any suggestions?