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#1
03-01-2007, 03:26 PM
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500sec heat sporadic
the heat will work fine til i get the car up to speed on the highway, then it starts blowing cold air.
my indie says it seems to be losing the signal to the hot water valve. any smart ideas? tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis. 
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#2
03-01-2007, 03:28 PM
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Two things come to mind. The first would be a bad Monovalve. The second would be a bad thermostat.
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#3
03-01-2007, 04:50 PM
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the mono valve needs power to close,so unplug it and go driving.if the heat stays on,then the push buttons are at fault.if it behaves as before then the diaphram in the mono valve probably has issues.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#4
03-01-2007, 05:36 PM
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coolant temp reads normal so stat seems likely ok.
thanks for responding. we'll check monovalve. tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
03-01-2007, 08:11 PM
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you can remove the top of the monovalve to check the diaphragm without taking the whole valve out of the car. A bad monovalve will show all sorts of wacky symptoms.
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81 300SD 87 300E 72 280SEL 4.5 03 Bajaj Chetak 64 Vespa GS 160 (slow restoration)
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#6
03-01-2007, 09:24 PM
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thanks guys. i will pass the info along to my indie.
tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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