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  #1  
Old 02-07-2002, 07:56 PM
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Location: Canton,Texas
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Temp.?

What should the temp. gauge read when the engine is warmed up? I think my thermostat may be stuck, heater doesn't really work at highway speeds but it does great in stop and go, makes me think the thermostat stays open all the time. I've never noticed that the heater didn't work well, but I rarely get to use it.


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I don't know how many have noticed, but spell checker no longer works.

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1985 300D Turbo ~225k
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  #2  
Old 02-08-2002, 06:17 AM
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Replace the monovalve "insert". It is located on the firewall in front of the passenger compartment. I had the same problem and this is what it took to fix it.
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  #3  
Old 02-08-2002, 08:36 AM
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Should read an RCH above 80.
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1981 300CD (Benzina)
1968 250 S (Gina) 266,000 miles!
1983 Alfa Romeo GTV6 (Guido)
1976 Jaguar XJS-saved a V-12 from the chevy curse, what a great engine!
1988 Cadillac Eldorado (better car than you might think!)
1988 Yamaha Venture (better than a Wing!)
1977 Suzuki GS750B
1976 Yamaha XS 650 (sold)
1991 Suzuki GSX1100G (Shafty Gixser)
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  #4  
Old 02-08-2002, 08:30 PM
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It has only been going to about 60 but today it went up to 70 or so. It was warmer today so I didn't need the heater, but I tried it and it really pumped out the hot air. A bad thermostat would also explain the worse mileage in colder weather. Thanks, I guess I'll get a new thermostat and put it in, I'm going to flush the system and put new antifreeze in while I'm at it.
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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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  #5  
Old 02-10-2002, 08:08 AM
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re; thermostat.

Fortunately for us, thermostats in general fail in the open postion.
This will result in overcooling, and a low reading on the gauge.

Another indicator would be a fluctuation at the gauge. It will read cooler when you are on the freeway with lots of air going through the radiator.
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Ed
1981 300CD (Benzina)
1968 250 S (Gina) 266,000 miles!
1983 Alfa Romeo GTV6 (Guido)
1976 Jaguar XJS-saved a V-12 from the chevy curse, what a great engine!
1988 Cadillac Eldorado (better car than you might think!)
1988 Yamaha Venture (better than a Wing!)
1977 Suzuki GS750B
1976 Yamaha XS 650 (sold)
1991 Suzuki GSX1100G (Shafty Gixser)
1981 Yamaha VX920RH (Euro "Virago")
Solex Moped
1975 Dodge P/U camper


"Time spent in the company of a cat, a beer, and this forum, is not time wasted!"
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  #6  
Old 02-10-2002, 09:36 PM
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I figure it must have stuck in the summer, probably never got cool enough to close.
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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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  #7  
Old 02-10-2002, 10:08 PM
lrg lrg is offline
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My '85 reads 85-90 pretty consistantly. Even then the heating was marginal so I replaced the monovalve insert. The rubber diaphram was split. Boy did that make a huge difference! Now I get more than enogh heat.

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1987 300D Turbo 175K
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