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rooneyassoc777
Lv 4
Merceds 1981 heater issues?
The heater only works when she is stopped or driving slow. Is there a loose hose or vac line???
Update:
BTW Scott the heater would not work at all if it were clogged!
1 Answer
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- Scott WLv 78 years agoFavorite Answer
Plugged or dirty heater core,follow the coolant lines to the heater core see if they are both hot.If one is hotter the the other dirty heater core have it cleaned or buy a new one.
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