mahi2010bv Posted September 3, 2014 Report Share Posted September 3, 2014 Have a 1981 Datsun 210 1.5 engine, and for some reason it heats up when at the stoplights or when I'm parked and just idling. I already did a radiatior flush, read up how to check the thermostat to see if that was working, but I'm still unsure whats going on? Can someone help me figure this out.. runs fine and the temp is cool when running. I thought it might be the water pump not circulating antifreeze as it should, any suggestions? Quote Link to comment
Tucson620 Posted September 3, 2014 Report Share Posted September 3, 2014 Fan clutch? That solved my similar issue immediately. Quote Link to comment
ericsb210 Posted September 4, 2014 Report Share Posted September 4, 2014 I would be wary of the water pump. If you drain out about 2 cups of coolant (when cold) then let it warm up with the radiator cap off. You should be able to see the water circulating when your thermostat opens. BUT, your car is more than a few years old, it might be feasible to just change the waterpump and thermostat. They are both inexpensive and easy to do. Also if you haven't I would consider new hoses also. Quote Link to comment
ericsb210 Posted September 4, 2014 Report Share Posted September 4, 2014 Oh ya, unless modified you do not have a fan clutch. Quote Link to comment
datzenmike Posted September 4, 2014 Report Share Posted September 4, 2014 It was an option. Try turning the fan if it moves then clutched. Generally vehicle motion will cool an engine but in town or idling you need a fan. Over heating is simply lack of heat transfer from coolant to air and breaks down to two failures. Lack of air flow Excessive clutch fan slippage (if equipped) Should turn stiffly by hand if ok. Fan shroud missing. This increases the fan's efficiency Rad exterior blocked by dirt, bugs plastic bag. Loose fan belt.. usually loud squealing. Lack of coolant flow Rad interior blocked by hard water scale. Faulty thermostat. Soft return hose to block that collapses from pump suction. This happens mostly at high RPMs. Low coolant level Loose fan belt Brakes dragging Timing retarded Carb mixture lean (specially idle mixture) 1 Quote Link to comment
mahi2010bv Posted September 4, 2014 Author Report Share Posted September 4, 2014 I took it down to a radiator guy here in town, he said it was badly clogged. Going to pick it up tomorrow lets see if that was the solution. I did change the fan belt as a secondary measure, glad I did it was worn. Didn't look it from the top but it had its day. I was told that the carb is running to accelerated, they could do a rebuild for $110. At the moment I don't have that kind of money so that's out of the picture for the moment. Also, the mechanic checked the water pump and thermostat which he said were all in working order. I did notice when I go up hill its at a slow crawl, and the car slowly heats up. Now I'm not a mechanic just a guy who likes cars, I was thinking maybe be it could be the head gasket? Anyone help me with that? And now a another thing that just came up, when I start to move the car I hear grinding and feel it coming from the passenger side, could this be the bearings? Again not a mechanic just a guy who likes cars Quote Link to comment
mahi2010bv Posted September 4, 2014 Author Report Share Posted September 4, 2014 The car doesn't have a fan clutch but thanks for the suggestion. And the last owner it looks like replaced the radiator from a new model Nissan, so the hoses that came along with the radiator are pretty good. Quote Link to comment
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