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#1
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Cooling system PROBLEM!!!
1992 300e The cooling system isn't working. I have tried taking out the thermostat, replacing the thermostat. The pump isn't leaking or making any noise. I have now removed the radiator to see if its clogged, it seems to be fine. I 've taken the serpentine belt off and the water pump feels okay. Also when the pump is spun by hand the coolant in the thermostat housing appears to move through the engine. I've also checked the fan, it spins about 1/3 of a revolution. I really don't think that the pump is shot, but I don't see what else it could be. What else should I check before I start ripping into a tough job.
Thanks in advance Dan
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#2
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head leak?Weak hose being suction in.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#3
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It doesn't seem to be leaking at the head, I'm not losing any coolant. The hoses look okay too.
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#4
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What kind of temp readings are you getting?
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Jim |
#5
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The gauge is pegged. The radiator when its done that has been cool, it doesn't appear to be flowing. The tank is full as well. Have also installed new cap and temp sending unit.
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#6
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The radiator should be pretty hot to the touch. Sounds like you are on the right path in regards to no flow. Was their any visible build up in the radiator? How did you check for flow through it? Did it just start doing this all of a sudden or did the temp creep up till it got where it is today?
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Jim |
#7
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thermostat?
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#8
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No there wasn't any build up on the radiator that I could see. I took it (the radiator) to work and blew it out with air. I also capped off the inlet and the opening to the reservoir and blew it out that way as well (100 psi). No debris at all and good air flow. It sounds of though you're thinking the water pump (what else could it be at this point).
I don't see what could be wrong with it, its not leaking, it doesn't wobble, and its only an impeller. Any clues as to what would fail?
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#9
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Maybe water pump impeller broke off clean.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#10
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I guess that I will replace the pump...from what I've read its a real bear of a job. Thanks for your help, I'll let you know if its a happy ending or not.
Thanks again Dan
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#11
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Check the fan and fan clutch too. The fan should "whoosh" when it's hot and you accelerate from idle.
Is it possible you have air in the system? I think 104's have bleed screws in the block. Also, see if you get heat from the heater core. A symptom-free pump failure just doesn't sound right, especially when you get results with your hand test. Here's a pretty thorough link (for Honda's) jsut to make sure you've covered all your bases. It shows a corroded impeller, but notes that this is a very extreme case. http://www.tegger.com/hondafaq/overheating/index.html
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Prost! ![]() |
#12
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I was still pretty skeptical about the water pump being the problem. After checking many old posts I thought that the radiator made the most sense.
I just finished replacing (supplied by Phil) and it worked like a charm. Now the temp stays at the 80° on the gauge. Thanks to all who helped me on this frustrating problem.
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1986 300sdl 1984 300sd 1988 300se 1973 vw thing |
#13
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I suspect the fan clutch may be the culprit too!
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![]() 1989 300E 2005 Acura TL 2011 Hyundai Elantra Limited Swing hard! Take chances! |
#14
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Just to help with my own diagnosis - when you say it stays at 80, is that in stop start traffic as well?
Thanks
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1990 300TE "24 hours in the day. 24 beers in a case. Coincidence? I don't think so." |
#15
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Ummm.. I think it's fixed
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
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