Question about 2003 Nissan Sentra

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2003 NISSAN SENTRA HEATER BLOWING AMBIENT AIR. JUST REPLACED THERMOSTAT AND HOSE AS IT WAS OVERHEATING, BUT NOT LEAKING. SERVICE ENGINE LIGHT JUST CAME ON LAST WEEK.

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Let the engine get cold, and remove the radiator cap, fill the system to proper level and re test. run engine until thermostat opens, fans come on, then alow to cool again and re check engine coolant. If this does not work, or the thermostat does not open the thermostat is instaled backwards, remove and reposition.

Posted on Nov 17, 2009

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My air conditioner quit blowing cool air. My 2006 Nissan Sentra is leaking coolant out of a skinny black hose near the front left of the engine by the air conditioner line. how can I stop up the hole?


Good idea is to drain the coolant from your radiator, then replace the hose that is leaking and then fill with coolant to the proper level. Drive your car and have heater running to remove any air in the system.

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2003 nissan sentra is blowing cold air i changed thermostat stillblowing cold air i did notice that heater core hoses are both cold car is not overheating


remove both hoses from engine that passes through firewall to heater. put a stiff piece of wire in the hole and make sure it is clear. If there is no restriction, then the heater is choked up

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You have a leaking engine cylinder head gasket, this may be due to the previous overheat or a result of it, make sure when you have the engine repaired you find out if the cooling system is in good condition or the problem will recur.

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I have a 2004 nissan sentra 1.8 and the service engine light came on 700 miles from my next oil change.I took the car to a parts store and was told the 122 reading had to do with low coolant or possibly a...


More than likely the coolant level sensor(float) is corroded or stuck so it's reading low. If it's not overheating and heater is still blowing warm air, you can probably still drive it safely but keep an eye in temp CLOSELY! Something you might consider, is having your oil change done sooner than waiting for next 700 miles and have them flush your cooling system at same time - just for peace of mind,

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Are you sure there is not a air pocket in the engine after changing water pump,
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Nov 19, 2009 | 2004 Nissan Sentra

1 Answer

No heat ..help installed new heater switch, replaced water pump..replaced coolants, and thermostat......................what else could it be? Nissan 2003 GXE Sentra 1.8 L Engine/...


you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.

report results.

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2 Answers

Head gasket is damaged. 2005 Nissan Sentra, 1.8


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4 Answers

Heater blowing cold air


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2 Answers

Heater blowing cold air


My 05 sentra with 79k miles heat will warm up and then get cold after a mile of driving, we have tried to get the air pocket out, the mechanic stated he thought it could be a blown head gasket, another mechanic said it was a bad heater core. Any advice would be appreciated.

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does the car overheat at idle or travelling down the road? if the thermostat was not changed, thats first step. checking it is replacing it. possibly air-bound. then i would suspect a headgasket problem.

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