[W126 Coupe] 1985 500 SeC

[WRick11499 at aol.com]

Its cold here in MD. and my heater is acting crazy. Some times works and  
sometimes not.I bought a rebuilt  climite control unit and it does the  same 
thing.Some times the defroster blows hot and the center vents blows cold  and 
sometimes every thing works alright but most of the time   all  blow cold.The  
small pump on the firewall seems to be working plus I bought  a newOverload 
relay.If I disconect  a battery cable and then replace  it, itseems to be O.K. till 
I turn the key off, so I think it must be  electrical, are there other relays 
that I should check and where are they  located in the fuse box, has anyone 
else had a problem like this.Thanks for  any help    Rick 
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