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Old 07-18-2010, 04:00 PM
pifcat2's Avatar
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Question E320 constant heat problem? (not the duo valve)

After research I thought this was due to the duo valve so I replaced it and the symptoms did not change: constant heat unless AC is set to MAX.

I tested the valve I removed and found:
1) Taller cylinder seems to be a pump and it buzzes (turns?) with 12V
2) Smaller cylinder is the magnetic valve and it seems to close properly. I blew air into it with my hand on the other three ports and it stopped with 12V applied so I likely replaced a good valve!

The climate controller (cc) seems to operate for each button.

I rechecked the connector(s) voltages with engine on:
1) cc off: valve 11.90 (closed), pump 0.60 OK
2) cc & blower on, knob to cold: valve 0.56 (open), pump 11.43 (on) CONSTANT HEAT
3) cc & blower on, knob set to max cold: valve 11.82 (closed), pump .72 OK

Just to confirm, the L shaped connector is for the valve and the flat connector is for the pump?

I've swapped a cc with no change. Any ideas what to check next? Thanks in advance!

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E320 constant heat problem? (not the duo valve)-dscf7132.jpg  
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Old 07-18-2010, 05:08 PM
Starstruck
 
Join Date: Mar 2009
Location: Iceland
Posts: 423
Quote:
Originally Posted by pifcat2 View Post
After research I thought this was due to the duo valve so I replaced it and the symptoms did not change: constant heat unless AC is set to MAX.

I tested the valve I removed and found:
1) Taller cylinder seems to be a pump and it buzzes (turns?) with 12V
2) Smaller cylinder is the magnetic valve and it seems to close properly. I blew air into it with my hand on the other three ports and it stopped with 12V applied so I likely replaced a good valve!

The climate controller (cc) seems to operate for each button.

I rechecked the connector(s) voltages with engine on:
1) cc off: valve 11.90 (closed), pump 0.60 OK
2) cc & blower on, knob to cold: valve 0.56 (open), pump 11.43 (on) CONSTANT HEAT
3) cc & blower on, knob set to max cold: valve 11.82 (closed), pump .72 OK

Just to confirm, the L shaped connector is for the valve and the flat connector is for the pump?

I've swapped a cc with no change. Any ideas what to check next? Thanks in advance!
Interior heat sensors.

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