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2005 Altima 2.5 Overheating (58,000 orig miles)
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JRR1
User
Aug 16, 2015, 8:13 AM
Post #1 of 4
(1652 views)
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2005 Altima 2.5 Overheating (58,000 orig miles)
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Whether driving or idling, once the AC is on, the temp gauge needle starts to creep up to the high end of normal range after 30-40 minutes. Once I turn the AC off the needle drops back down, but still not to where it typically rests. Additionally, even with the AC off, needle creeps up when driving over 70mph after 20 minutes at or around that speed. No problems with AC off with in town driving at lower speeds. Just had a flush and fill 5000 miles ago. Not sure it makes a difference but the AC doesn't blow real cold.I don't see as that has anything to do with the overheating issue. Before I take it into the shop are there any things I can do first though. Is there anything I can do before getting raped at the repair shop? Thanks
removed links inserted by Nissan forum
(This post was edited by Hammer Time on Aug 16, 2015, 8:26 AM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 16, 2015, 8:21 AM
Post #2 of 4
(1648 views)
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Re: 2005 Altima 2.5 Overheating (58,000 orig miles)
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Raped at the repair shop?
When you have the ac turned on the heat from inside the vehicle is transferred to the condenser. Since the condenser is in front of the radiator, the heat from the condenser is picked up by the radiator. If the radiator isn't very efficient, the heat from the condenser compounds the problem. You could have a radiator issue such as plugged transfer tubes or corrosion inside the radiator that lessens the transfer of heat from the coolant to the atmosphere.
At higher speeds the engine is under more load which produces more heat. One symptom of a radiator issue is overheating or running hot at higher engine loads. Sometimes you can tell if a radiator isn't as efficient by turning on the heater full blast. If the coolant temperature comes back down to normal with the heater running full blast you should be looking at the radiator as a possible culprit.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 16, 2015, 4:01 PM
Post #4 of 4
(1631 views)
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Re: 2005 Altima 2.5 Overheating (58,000 orig miles)
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Ditto with HT on bashing techs here for free for you.
Let it go for now and some thoughts on why for a low mile close to 11 year old car with those symptoms.
1. More and more as the decades pass by cars need the air dam under front bumper at higher speeds. I see them all over the sides of the roads broken off for vehicles. If missing get that back properly as it forces air thru radiator/grille at speed on purpose not there for looks.
2. Dunno if this model is trained to shut off electric fans at highway speeds or not? One of the crew here might know. Reason is the electric fan at 70 MPH if running is probably/possibly messing up air flow and would be better off not turning.
3. Would be most common for a plain lousy radiator not capable of transferring enough heat. Even at speed if hot as all get out it could radiate heat backwards towards condenser and A/C wouldn't work well also when you would think it would be best.
OK - use of A/C should force fan on at least at lower speeds. At higher speeds many now shut that down as it isn't needed and doesn't help - some do by design, some don't.
Bet is on bad radiator and lack of changing coolant or wildly too strong on coolant which suks at transferring heat which is why they suggest max of 50/50 with few exceptions,
T
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