Have a problem with our '86 300sdl. Temperature gauge stays at around 40-50 degrees only. Up to the second line on the gauge or less.... Heater is really weak for some reason. Even if you turn the setting to the red mark... The blower works. Just wouldn't blow hot air....Having a hard especially with the cold season. Any help will be most appreciated....

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'76 300D
'82 230CE
'84 300DT
'91 300D 2.5
'86 300D 5 speed
'86 250D 5 speed
'90 300E 24v
'88 560SEC
300TE euro 5 speed
91 350SD
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