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#1
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Cabin heating issue - 1993 W124 300CE
Hi!
I have an issue with my cabin heating. Here are the symptoms: - Start up the car on a cold day, drive until the engine warms up a bit - Turn on the cabin air and set the temp to the mid-70's (should heat up the car) - Blows cold outside air without heating it up Here's how I fix it (strange.. but this 'fix' works consistently): - Sudden acceleration. I'll be sitting at a light, and on green I'll jab the throttle a bit, and suddenly, the air coming out of the vents is warmed up! No kidding, I've tried this on more than a dozen occassions and it works every time. If I don't do this, the air doesn't typically start blowing warm by itself. - I've tried to see if sudden braking would also be a fix, but it doesn't seem so. Any thoughts on the problem and a permanent fix?? Thanks!!
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1993 300CE |
#2
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There is a pump near the washer bottle that pumps when you are at idle. Does the car have heat when you are driving?
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#3
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Quote:
Does it have heat while I am driving? Yes, in the sense that when the engine warms up, and after I've done my 'fix' described above, the cabin hvac will blow warm / hot air.
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1993 300CE |
#4
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Id look at that pump, the mono valve, and do a flush while your at it. Those are the only 3 possibilities.
When you punch the throttle, you increase the rpms of the water pump, therefore increasing pressure. Something "breaks free" and starts to let the hot water through.
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#5
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Quote:
It recently had a coolant flush actually following a replacement of a hose (this problem was ongoing before the flush as well).
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1993 300CE |
#6
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There is a small electric pump that is mounted near (below slightly) your washer fluid bottle. It supplies hot water to the cabin when the car is at idle when the mechanical water pump does not have enough power (rpm)
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Eugene 10 E63 AMG 93 300te 4matic 07 BMW X3 14 Ford F-150 Fx2 |
#7
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Ah, thanks for clarifying! I will check that out soon and post back.
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1993 300CE |
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