I have a 1998 mercedes e320 my heater works on driver side passenger side blowing cold what's going on

U have a Mercedes and the dealer will rip you off for sure. That is a Mercedes thing. Unfortunate thing is that the car has class A engineering but of what use is it when the reliability is below par?

U got the correct info on the culprit but do you want to pay the price?!?!?!!??

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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These will help.

Thanks.

you have shutter actuators that are mounted externally on you heater core enclosure inbetween your dash and firewall most likely in center. if not in center then behind glove box.

To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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No heat on car? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows intermittently and temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not hot air? http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html-------- Heater/AC blower motor not working?

http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

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A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html Heater problem? http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------

This will help.Thanks.

To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

------
Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------
Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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This will help.Thanks.

To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.------
Engine Overheats and heater blowing cold? http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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This will help.Thanks.

sounds like itslo on freon or has a temp door actuator stuck prob. just lo on freon

More than likely you are low on freon. They will blow cold on the right then quit when low. If it is making a hissing noise charge system now. It is a process to get it going again with the computer climate control.

Hello, Here is a way to ck the codes in the climate control system.
Ignition ON
Temperature selector Left Hi Right Low
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The LED in the car flashes and the display di A
Press auto repeatedly until all DTC's are shown. Record all DTC's
Each malfunction (short circuit, open circuit, etc) has a specific DTC
The letter "E" (error) is displayed in the left of the display and the DTC is displayed in the right of the display. By pressing the AUTO button the next DTC stored in memory will be displayed
To erase, This is only possible after all DTC's are read out
Simultaneously press both AUTO buttons for more than 2 seconds
"d" will be displayed on the left side of the display window and "FF" on the right side
The only problems that I can think of that will cause this problem are as follows;
006 right heater core temp
020 right duo valve
I hop this helps. CYA Gator241

sounds like the drivers temp door actuator is not working should be located on the drivers side of the air box down by the gas pedal or center dash area