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Engine overheating

(1993 Honda Civic)
in Lexington, VA on July 13, 2011
My 1993 civic lx temperature gauge needle approaches the red line in 5 mins after starting. I replaced the thermostat, but the same hot temperature occurs. The cooling fan did not come on, but it works as a direct power line from the battery to the fan turns on the fan. Can the high temperature be caused by the cooling fan relay swithc not working or is the water pump inop or ? Will flushing the radiator fix it? There is no leaks with the radiator.
Displaying 2 answers & 2 comments
Popular Answer
on February 03, 2012
had the same problem with my 93 civic, radiator looks bad, thought that's the problem. but after changing the radiator and thermostat the car still runs hot, decided to change the head gasket, after changing it, the car runs normal, it was a blown head gasket... hope it helps :)
Bridge the two wires at the cooling fan switch and see if the fan then works. There are 3 different 1.5L engines in your car a VTEC, a 16 valve and a * valve all are a little different. Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
The water pump rarely fails, if you have no leaks and have replaced the thermostat, I would hope it is a bad radiator fan switch but as you drive down the road a freeway speeds rush air through the radiator is what cools the radiator not the cooling fan (in fact you could take it off and at 30 or 40 mph air going through the radiator is sufficient to cool the engine. My fear is your engine may have a blown head gasket (common problem ) have a simple chemical test know as a "block test" done it looks for the presence of Carbon Monoxide in the cooling system which would only be present if the head gasket was blown.
on July 14, 2011
Patrick thanks for the information. I did run a wire from the battery to the cooling fan and the fan operated fine. I was thinking of replacing the cooling fan relay switch. I drove the car for less than 10 mins at 40-50 MPH and it did not cool down in fact the temperature was a needle width's away from red line. I have no coolant leaks. I'll have to have the block test down. The engine I have is a 16 valve (B16A).
on July 25, 2011
The problem was the engine coolant temperature sender. An inaccurate temperature was being sent to the temperature gauge. So, there was no head gasket damage.
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