2000 S500 - replaced water pump and now heat doesn't work - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 01-04-2012, 05:46 AM Thread Starter
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2000 S500 - replaced water pump and now heat doesn't work

just took the S500 to have the water pump replaced and now I have no heat in the front vents but heat on in the back works. I also can not turn the AC on. The light for the AC off is stuck on regardless if I push the button multiple times.

Any thoughts on what I should do. I plan to return it to repair shop but would like some inside knowledge on what these guys may have done wrong.

Could it be a duo valve or air pocket? Curious to know why the AC off light stays on. If I take it back to the dealership I'm afraid of them telling me something else if broke and another charge.

Thanks

Last edited by mgohlke; 01-04-2012 at 06:55 AM.
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post #2 of 6 (permalink) Old 01-04-2012, 08:11 AM
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A potential air lock, thing to do is remove the header tank cap and start the engine, put the heating on full blast and idle the engine until working temperature is reached, then rev the engine at 2000 rpm for a few minutes and watch for air bubbles at the header tank, this normally cures it.

ERIC.

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post #3 of 6 (permalink) Old 01-04-2012, 08:17 AM Thread Starter
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A potential air lock, thing to do is remove the header tank cap and start the engine, put the heating on full blast and idle the engine until working temperature is reached, then rev the engine at 2000 rpm for a few minutes and watch for air bubbles at the header tank, this normally cures it.
Thanks. I'll try it. By "header tank cap" do you mean the radiator cap?
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post #4 of 6 (permalink) Old 01-04-2012, 08:29 AM
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Thanks. I'll try it. By "header tank cap" do you mean the radiator cap?
Radiator cap? that is an old saying for Benz LOL. OK yes radiator cap it is, this is much like winding a baby, it works better with the mouth open. You may find some burping and air will push some coolant out, no biggy just add more coolant and when the air stops then replace the cap and the hot air should be flowing in the car, no hot air? then keep it running until hot air comes out.

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post #5 of 6 (permalink) Old 01-05-2012, 11:06 AM Thread Starter
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Well Eric, Your solution provided temporary heat and a lot of gas wasted while reving the engine to 2000 RPM's for an extended period of time. Heat came on on during that period only to return to cold air after exercise was done and car was driven under normal driving conditions.

Anyone else with any thoughts? AC off light is still lite up to OFF and won't turn on.
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post #6 of 6 (permalink) Old 01-05-2012, 06:43 PM
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What temperature is the engine running at? Why did you change the water pump to start with? Is the thermostat stuck in the open position? Disconnect the battery at the negative terminal to attempt to clear the fault code set on the AC system.

ERIC.

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