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#1
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Engine runs hot only when AC is on?
I have noticed that my 1987 300D has been running hot when the AC is on. The AC system works great. The engine runs around 85-90 when moving but if i am in traffic the temp creeps up to 100, which is when i turn the AC off and the temp then returns to normal. any thoughts?
Thanks, G |
#2
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Electric fans working properly?
__________________
Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#3
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they seem to come on but I am not sure what the exact operating protocols are for them.
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#4
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AC puts extra load on the motor and is making the condenser warm. That part is totally normal.
Most Mercedes high speed fan switches are 105*C. Have you let it go just past 100* to see if the fans kick on? My cars get over 100* with the AC on and at 105* the high speed fan comes on the temp holds and then drops down a bit in traffic. When you start moving the temp should drop back down in between 80 and 100.
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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i |
#5
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I have not let it go over 100*F. does the fan change speeds? if so will it be visually obvious when the fan goes in to high speed? or is this just that the fan will turn on at 105*F?
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#6
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I can't remember on the 87 if the big single fan is dual speed.
The 2.5 cars used two E-fans, a high and a low speed. Also, your mechanical fan clutch could be getting weak.
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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i |
#7
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there are two fans on inside and one outside of the radiator/cooler. I'll take a look later this week when it stops raining and gets hot again.
thanks |
#8
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Insufficient cooling
Quote:
Jeremy
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
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