So this weekend was the first really hot weekend, and i went on a road trip, about 200 miles. The whole freakin trip, my temp gauge was about 2/3-3/4 up on the gauge.
It would stay there and never get hotter. It would get cooler when I got into slower traffic though, its perfectly fine when cruising @ 40mph and 2000rpm. But at 65mph and 2800 rpm, the temps rose up.
When I pulled over, you could hear the coolant bubbling in the radiator under the cap with your ear close.
I waited for it to cool, and checked the fluid level, which was fine. It took about a 300ml to top it off, but nothing significant.
I felt both upper and lower rad hoses and both were hot as sin (to me that meant thermostat IS openning? properly.)
Im no exactly rich so I love some insight on how to tell what the problem is.
Has anyone ever done a waterpump swap on these cars? I just looked at the manual, seems VERY tricky
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: Q45tech at 10:34 AM 6/15/2009
I flushed the rad earlier this year
When you say, clean out the trash between the condensor and rad, you mean the a/c consensor? they are connected with a rubber hose? and how would i clean such contaminents out
The coolant itself looks perfect, and the fluid level was perfect. I did just replace the rad cap a few minutes ago.
Modified by longhornsqx4 at 11:50 AM 6/15/2009
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: longhornsqx4 at 11:49 AM 6/15/2009
http://cgi.ebay.ca/97-98-99-00...%3A50
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: Q451990 at 8:28 PM 6/15/2009
| Quote, originally posted by longhornsqx4 » |
| I just dont know if quality comes into play with a radiator. Im just quite broke at the moment |
Quality certainly differs between OEM and some aftermarket parts, but if you're broke and this fits your budget vs. OEM new, I would go for it. 80 or 90% as good as OEM is certainly better than one that's causing an overheat!
Heath
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: longhornsqx4 at 9:10 PM 6/15/2009
The aftermarket ones are $150-200
Quite the savings for a college kid, thats 3-4 weeks worth of food for me
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: longhornsqx4 at 9:10 PM 6/15/2009
Cause it doesnt overheat after like 20-25min of in town 40mph driving
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: Q45tech at 9:34 AM 6/16/2009
Now driving up an incline or mountain can be severe due to time!
Obviously 1/3 goes out exhaust and 1/3 in conducted/radiated away to unhood/hood/body/transmission housing, leaving the cooling system/radiator to get rid of the rest [1/3].
Often much can be gleened from data logging* [real exact coolant temperature] from a COLD start [<100F] to warm up vs seconds/minutes AND RPM in PARK no ac, then doing the exact same thing with ac on [adds 3 HP or 36,000 BTU/hr.
With a +- 1F accuracy you can see in data when the thermostat opens.
* with Consult or other software and OBDII adapter/laptop.
When you replace radiator be sure to visually check condenser for air blocking bent fins, whether auxillary condenser fan works [controlled by ecu and HVAC computer thru ecu], replace upper and lower heater hoses and thermostat [usually fails open = no warm up but helps in winter].
Luckily the cooling system is 90 year old technology so every radiator shop can diagnose often better than dealers can.........not their specialty!
The problem is the rad shop may not have Nissan specific OBDII test equipment to accurately read coolant BUT much can be done with an IR temp measuring gun but spot on accuracy is lacking as the hood must be opened to read coolant and that will change things SIGNIFICANTLY!!!!!!!!
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: SteveTheTech at 10:22 AM 6/16/2009
The QX4 can get tricky and expensive whne attempting to diagnose an overheating condition. You may want to pull the spark plugs and check for signs of coolant burning. There is one thermostat on these but there is water control valve located at the rear of the motor on some of these.
Although an overheating concern is not common they do happen and without a proper diagnosis you will be making expensive guesses.
Are you noticing any smoke from the tailpipe?
Is your overflow bottle empty?
What kind of maintenance have you performed on the cooling circuit?
Post Title: Re: My Qx4 is overheating (SteveTheTech)
Posted by: longhornsqx4 at 1:54 PM 6/16/2009
I did flush the coolant today, simply drained it, filled it back up 2-3 times with tap water and drained it again, then just let the hose run through it for a few minutes, then drained and filled back up with proper coolant
So I guess we will see what happens.
If it overheats again, I guess its safe to say my rad should be replaced?
I also notice zero changes in fluid levels of coolant, overflow stays right at the max line, no smoke from the exhaust, or sweet coolant burning smell
Post Title: Re: My Qx4 is overheating (longhornsqx4)
Posted by: SteveTheTech at 2:40 PM 6/16/2009
| Quote, originally posted by longhornsqx4 » |
| I also notice zero changes in fluid levels of coolant, overflow stays right at the max line, no smoke from the exhaust, or sweet coolant burning smell |
That is a good sign.
I would say that in this case a radiator may be at fault, but I would not be surprised if it were something else. So you might want to prepare yourself.
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