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#1
01-26-2007, 10:10 PM
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Rattling Chirp from Thermostat Relay
Hi guys,
I've got a 300d that when I turn on the heat I hear a chirping sound like a relay is trying to click. This happens after I've been driving for a while. Turning the dial to all red (30C I think) when it's as hot as it goes, the chirp stops. Any ideas? Thanks!
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's. 
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#2
01-26-2007, 10:22 PM
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You're listening to the monovalve cycle open and closed.
With the temperature wheel on full warm, the valve remains open and it does not cycle. The question is "why"? The SD recently did the same thing and I had to unplug the auxiliary water pump to stop the behavior. I'm suspicious of that pump........possibly affecting the operation of the monovalve..........but, it's a relatively new pump and the amperage checks out........... 
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#3
01-26-2007, 10:50 PM
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Hi Brian,
Will changing the monovalve fix the prob? Mines bad (no heat over 60mph) so I'll be changing next week. Really the chirps not a big deal but it makes my wife nervous once in a while 
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-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
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#4
01-26-2007, 10:51 PM
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By the way... anyone needing mono valves can get them for $12.50 on ebay or from another source if anyones interested.
__________________
-E300d '99 350k -Suburban '93 220k -TDI Jetta '03 350k Sold -F250 '96 7.3 -Dodge Ram 12V -E320 '95 200k -E320 Wagon 1994 155k -300d Turbo '87 187k miles -E320 1994 200k -300d Turbo '84 245k (sold to Dan62) -300d Turbo '84 180k -300sd '80 300k -7.3 Powerstroke Diesel 15P Van 500k+ miles -190d '89 Non Turbo 2.5 5cyl 240k (my first MB) Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
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#5
01-26-2007, 11:03 PM
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Quote:
I'm really not sure what causes it, but, I disconnected the aux. pump because I'll bet that the CCU will get fried in short order with such a loud sound coming from the monovalve. Further investigations required.
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