xrobk818x

hello everybody , i bought a 1997 s500 today and need some help with the heater. a/c on works perfect, but when you turn the heater on nothing blows threw. the center buttons up top dont even light up the hot/cold switch between the vents , what should i look for does anyone know .... please help

KoosKoos

Probably you have a faulty heater valve.

xrobk818x

do you know if its easy to replace and how much is the cost, and thank you for the info

KoosKoos

Its not that hard to replace. The List price is $ 580, but
Parts.com has it for $397.90

Part# is A001-830-14-84

xrobk818x

OK THIS IS WHATS GOING ON , I CHECKED IT AGAIN BASICALLY WHEN ITS ON A/C THE CENTER VENTS BLOW COLD AIR AND THE SIDE ONES BLOW WARM AIR. THEN WHEN I SWITCH IT TO HEATER NO MATTER WHAT SETTING ITS ON THE CONTROL PANEL THE DEFROSTER SECTION IS WORKING NOTING FROM THE CENTER VENTS , SIDE VENTS BLOW LITTLE HOT AIR AND THE FOOT AREA BLOW STRONG , AND THIS IS ON FULL BLAST, ALSO THE CENTER VENTS HAS 2 SWITCHES RIGHT , IT DOESNT TURN ON AT ALL I CANT SWITCH IT TO HOT OR COLD. , IS THIS GOOD INFO YOUR YOU TO KNOW FOR SURE WHATS GOING ON? THANX FOR ALL THE INFO YOUR GIVING ME