I have a 93 4 cylinder Nissan KingCab that for some reason continues to run hot in the summer. I have 30,000 miles on new engine. I have a brand new radiator, thermostat, water pump and 50/50 on the antifreeze. On 80+ days as you continue to drive on the interstate with the A/C on, it slowly gets hotter and hotter until the guage is almost to the top (maybe 15 miles). As you slow down to 55 or less or turn off the A/C, it starts to cool down but never gets back down below halfway. I have noticed some posts about bleeding the coolant system, possibly that is it. I would also opt to pay for a larger radiator or something if someone knows if such a thing exists.
I have a 93 4 cylinder Nissan KingCab that for some reason continues to run hot in the summer. I have 30,000 miles on new engine. I have a brand new radiator, thermostat, water pump and 50/50 on the antifreeze. On 80+ days as you continue to drive on the interstate with the A/C on, it slowly gets hotter and hotter until the guage is almost to the top (maybe 15 miles). As you slow down to 55 or less or turn off the A/C, it starts to cool down but never gets back down below halfway. I have noticed some posts about bleeding the coolant system, possibly that is it. I would also opt to pay for a larger radiator or something if someone knows if such a thing exists.
Thanks
I was going through my Haynes manual and it mentioned 89 and older 4 cylinders must have the jiggle/air bleed valve on the thermostat in the most upper position. It didn't explain why the valve has to be installed high. Just a wild guess, but could that be it?
I have a 93 4 cylinder Nissan KingCab that for some reason continues to run hot in the summer. I have 30,000 miles on new engine. I have a brand new radiator, thermostat, water pump and 50/50 on the antifreeze. On 80+ days as you continue to drive on the interstate with the A/C on, it slowly gets hotter and hotter until the guage is almost to the top (maybe 15 miles). As you slow down to 55 or less or turn off the A/C, it starts to cool down but never gets back down below halfway. I have noticed some posts about bleeding the coolant system, possibly that is it. I would also opt to pay for a larger radiator or something if someone knows if such a thing exists.
Thanks
I'd check the thermostat like NPath suggested. You may even want to remove the thermostat for a test just to take it out of the equation.
You may want to check your hoses and make sure they're not collapsing.
Do you have anything blocking air flow (dirty A/C condenser, aux lights, etc.)?
Is the fan clutch operating properly?
__________________
Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
I was going through my Haynes manual and it mentioned 89 and older 4 cylinders must have the jiggle/air bleed valve on the thermostat in the most upper position. It didn't explain why the valve has to be installed high. Just a wild guess, but could that be it?
I am not sure where exactly the jiggle/air bleed valve is positioned. I did not notice where I placed it, so it could be just about anywhere. I can try removing the thermostat altogether. That is a good test.
I am not sure where exactly the jiggle/air bleed valve is positioned. I did not notice where I placed it, so it could be just about anywhere. I can try removing the thermostat altogether. That is a good test.
PS. The fan clutch is new, also. I have noticed some posts about the radiator cap. I am replacing that as well today. The one that is on there is really old. I assumed it was good, since it never boils over. I am seeing that is not the case sometimes. The A/C core "looks" ok. And no obstuctions other than that..
Next step get radiator cap.
Remove Thermostat.
Bleed system? (I will check with Haynes on that one)
I am not sure where exactly the jiggle/air bleed valve is positioned. I did not notice where I placed it, so it could be just about anywhere. I can try removing the thermostat altogether. That is a good test.
The jiggle/air valve is located on the thermostat itself. It's a small piece of metal that's loose and rattles.
I would like to start off by saying thanks for your suggestions and help. You guys are great and without your input I may never have figured this out. I want to back up and say that the problem with my truck running hot has been an ongoing problem since my truck was purchased 4 years ago with 90,000 miles (it now has 200,000) and the result of the loss of 2 previous engines, a radiator, several water pumps, thermostats and clutch fans. After 2 trips to the Nissan dealership and 2 mechanics said there was nothing that could be done I gave up and accepted the fact that it must be a design flaw or something else. The other day after cleaning the A/C condensor and removing the thermostat for the 5th time I noticed it was starting to overheat when idling as well, something normally associated with a fan clutch, since the thermostat was out at this time. Inspecting the fan clutch revealed it was working perfectly, but then I discovered the real problem that has been my nemesis for all these years. The fan was on backwards!!! It has been replaced backwards through all of the repairs and trips to the dealerships, and replaced engines. It is obvious which side is the side that was previously placed against the engine and everyone, including myself, just put it back like it was. With most fans it probably would not have made much difference, but the fan on my truck has blades that curve out and around at the end and if that side is put to the front, the fan is pretty much useless.
I hope this post will help someone else to avoid the years of aggrevation and expense that I have experienced. Keep up the good work.
I would like to start off by saying thanks for your suggestions and help. You guys are great and without your input I may never have figured this out. I want to back up and say that the problem with my truck running hot has been an ongoing problem since my truck was purchased 4 years ago with 90,000 miles (it now has 200,000) and the result of the loss of 2 previous engines, a radiator, several water pumps, thermostats and clutch fans. After 2 trips to the Nissan dealership and 2 mechanics said there was nothing that could be done I gave up and accepted the fact that it must be a design flaw or something else. The other day after cleaning the A/C condensor and removing the thermostat for the 5th time I noticed it was starting to overheat when idling as well, something normally associated with a fan clutch, since the thermostat was out at this time. Inspecting the fan clutch revealed it was working perfectly, but then I discovered the real problem that has been my nemesis for all these years. The fan was on backwards!!! It has been replaced backwards through all of the repairs and trips to the dealerships, and replaced engines. It is obvious which side is the side that was previously placed against the engine and everyone, including myself, just put it back like it was. With most fans it probably would not have made much difference, but the fan on my truck has blades that curve out and around at the end and if that side is put to the front, the fan is pretty much useless.
I hope this post will help someone else to avoid the years of aggrevation and expense that I have experienced. Keep up the good work.
Wow. Someone else posted about overheating and I think I put fan mounted backwards on that post even though I've never actually heard of anyone doing that. So it was trying to push air out of the engine compartment. That must've given the fan quite a work out at speed. That's a shame. Anyway, I'm glad you got it worked out.
__________________
Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
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