Question about Nissan Maxima

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Replaced leaky radiator on a 2001 nissan maxima. Chaned t-stat at the same time even though it hadn't failed yet. Now, when the electric fans come on, they stay on the whole time and don't cycle on and off like before. The upper hose is hot and the lower hose is cold. Not warm but cold. Could the t-stat be stuck closed or just barely opening? pressure on the hoses seems to be excessive when compared to my other car. what could be causing this?

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  • mpdisaster Nov 13, 2010

    Yes, I had the heater on high when filling the radiator. The temp guage stays at less than half way as it did before. I have "burped" the system twice. I used that giant funnel that is sold that states that it can help rid system of air. The 2001 model doesn't have a bleeder valve. I did raise the front end up as was told to before to make sure the air exits the radiator opening. The t-stat is new but not oem. I got it at autozone. Could it be faulty? It is incorporated into the housing and the little bleeder thing on the t-stat is on top.



    I don't recall seeing any "flow" in the fluid when the fans came on but the level did drop. I may be expecting to see flow like river would.

  • mpdisaster Nov 13, 2010

    I checked to see if thermostat was installed wrong. No, it was fine. I then reinstalled it and filled the system with coolant mixture making sure heater was on high. When the fans finally kicked on, I still failed to see any flow from the the radiator. The coolant would just vibrate. The weird thing is that it doesn't appear to be overheating. This all started when I changed the radiator and t-stat. I am pretty sure it is going to be a faulty t-stat. I will have to wait until tomorrow now. Any other ideas or suggestions?

  • mpdisaster Nov 13, 2010

    Thanks, it turned out to be the thermostat after all. It would only open very slightly. I bought a new one from Nissan this time and installed it. All is well again and was able to notice coolant flow in the radiator when the t-stat finally opened.

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Did you start engine cold, rad cap off, and heater turned on, (heater, not defrost mode) while adding coolant when level goes down as you let engine run to operating temperature? Watch for flow in rad, when fans come on. Thermostat may be the problem but let's eliminate airlocks in system first.

Posted on Nov 13, 2010

  • Mike Butler
    Mike Butler Nov 13, 2010

    You should see flow, shortly before fans come on, and if coolant level is going down, add some to top it up at that time. Don't raise front of car, and watch in rad for flow, then fan should come on to cool incoming (hot) coolant. You may have to let that fan come on 2 or 3 times, then off each time before you get all the air out. If that doesn't do it, I'd try another thermostat, as that would not be the first time a new one was faulty. Yes straight up on vent, and double check it's facing right way.

  • Mike Butler
    Mike Butler Nov 13, 2010

    As i said in earlier post, you'll need to watch rad BEFORE the fans come on. Keep an eye on your temp gauge and as it gets close to normal operating range, start keeping a close eye in rad for flow. When engine temperature reaches 185F-195F, whatever thermostat is rated at, the thermostat will (should) open and then coolant will return to radiator for cooling again, thus the fan comes on. After rad and fan, cool that coolant from engine, fan shuts off, and when thermostat opens again, coolant returns to rad for cooling again, thus fan comes on again. You have to look before. I usually watch temperature gauge and when I see it coming up close to normal operating temperature, I start looking in rad until I see flow. Leave thermostat in for now, and do as I describe, and see if fan shuts off after a short time of cooling. If temperature gauge isn't running hotter than normal, I wouldn't worry about the thermostat. Make sure heater is giving out heat as it should and engine temperature is normal, not higher. When running down the road, the air flowing through rad will normally do what the fan does when sitting still, thus fan won't come on too often, if at all. If fan continues to run constantly when sitting, get back to me, otherwise it sounds like your o.k.

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COOLING FAN CONTROL
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF ].

A couple of things to check,
1) did you put the thermostat in correctly and not backwards ?? rule that out . also did you test the thermostat in boiling water to see if it opens. just because its new doesn't mean its not defective. it should open at 203 degrees or 95 Celsius
2)is the Air-conditioning on?? this will keep the fans active.
3) there also could be and air pocket in the system run the vehcile a while and watch the temperature then turn off the car, let cool and check levels DO NOT OPEN HOT. keep in mind also the upper hose will be hotter then lower hose but not cold to touch.

if non of these solve the issue further testing is needed seek a professional,

Hope this helps

Posted on Nov 13, 2010

  • Dak408
    Dak408 Nov 14, 2010

    Glad my suggestion on the thermostat helped ,,,

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