ElliotV Posted December 4, 2023 Report Share Posted December 4, 2023 I recently purchased a 85 Nissan 720 and have been having trouble getting it warm. I replaced the thermostat(previous owner bought it so I have no idea what temp it is) and it won't get warm except a little bit on the highway and that is only if it is warm enough outside. I was messing with it yesterday thinking the fan clutch might be bad then found out you can't replace it without doing the water pump either then found out it is supposed to have some resistance when it is cold. I did run it without the fan on it for about ten minutes just idling and it started to get warm when it was probably 45f out. Wondering if anyone has any ideas because it isn't even getting hot enough to open the stat. I'm wondering if I can get a more limiting stat to flow less when it is closed. You can also really hear the fan moving when driving it around. Quote Link to comment
Thomas Perkins Posted December 4, 2023 Report Share Posted December 4, 2023 Maybe your water pump is bad.Your radiator is not clogged up.Your belt is good and tight.Thermostat is 180 degress type..Did you test it before installing?Did you burp it after putting thermostat in? Quote Link to comment
NC85ST Posted December 4, 2023 Report Share Posted December 4, 2023 Could the gauge be bad, reading incorrectly? Quote Link to comment
datzenmike Posted December 4, 2023 Report Share Posted December 4, 2023 If the top radiator hose is too hot to hold then it's warming up. When ever I have a suspected cooling system problem, I just put a new thermostat in. You don't need to 'burp' the cooling system. As soon as the thermostat opens for the first time any air bubbles will flow out into the top radiator tank. Just top it up later. Quote Link to comment
DwayneOxford Posted December 5, 2023 Report Share Posted December 5, 2023 Have same prob on my '83 Subaru. Good water and air flow, hottest thermostat available. Engine runs cool, have next to no heater. Quote Link to comment
Thomas Perkins Posted December 5, 2023 Report Share Posted December 5, 2023 If you don't get the air out , it will run hot.I always burp mine for 29 years.I aways take the radiator cap off, start up, wait for thermostat to open,Then add fluid,then put cap on,take for a drive ,then check my over flow container.Works this way for me. Quote Link to comment
Stoffregen Motorsports Posted December 6, 2023 Report Share Posted December 6, 2023 On 12/4/2023 at 1:52 PM, NC85ST said: Could the gauge be bad, reading incorrectly? That's what I always assume. You have to know what the engine is actually doing. Not just what a 40 year old gauge is telling you. Quote Link to comment
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