Heat takes a long time to warm. - Nissan Forum
GA16DE 1.6L Engine Engine Discussion: 91-99 Sentra, 95-98 200SX, 91-93 NX1600

 
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post #1 of 10 Old Jan 29th, 2007, 10:45 AM Thread Starter
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Heat takes a long time to warm.

Can a bad thermostat cause the heat to take extremely long to warm up?
Does antefreeze have anything to do with it?
When it does warm up, the heat comes and goes. Any ideas?
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post #2 of 10 Old Jan 29th, 2007, 10:29 PM
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if a thermostat gets stuck open, it will take a long time to warm up the engine. Driving my sentra, I'm starting to get warm air out of the vents about 1/2 a mile after I start driving usually.
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post #3 of 10 Old Jan 29th, 2007, 10:54 PM
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Does your temperature gauge move to the normal temperature range slowly as well? If the car is heating up at a normal rate, but the air coming from the vents is not, then you may have a partially obstructed heater core or heater hoses, which might explain the heat coming and going.
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post #4 of 10 Old Jan 30th, 2007, 09:47 AM Thread Starter
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Quote:
Originally Posted by mrgoose
Does your temperature gauge move to the normal temperature range slowly as well? If the car is heating up at a normal rate, but the air coming from the vents is not, then you may have a partially obstructed heater core or heater hoses, which might explain the heat coming and going.
That may be it mrgoose, the temperature gauge moves as it should and the engine gets warm as normal. Would you say the core and hoses are complicated to change?

I do have knowledge of normal maintainance like breaks, CV axles, tune ups, etc.
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post #5 of 10 Old Jan 30th, 2007, 10:05 AM Thread Starter
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Is there anything that I should try (cheaper) to narrow down the possibilities. Maybe a sensor, fuse or something? Or are you pretty confident that it's the core/hoses?

BYW, thanks you both for the replies.
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post #6 of 10 Old Jan 30th, 2007, 12:38 PM
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You don't have to replace the heater core, just clean it out.
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post #7 of 10 Old Jan 30th, 2007, 12:55 PM
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The heater system is actually fairly simple. It's just a fan blowing air through a mini-radiator (heater core) in your dash. The heat is provided by the hot coolant flowing through the heater core. So, if the engine is heating up just fine and the coolant is hot and the blower motor is blowing air, then the only thing left would be the flow of hot coolant through the heater core. If the flow is restricted you won't get enough heat exchanged to the air flowing through the outside of the heater core.

I'm not sure what sort of car you have, but changing the heater hoses on my 93 Sentra was a bit of a pain because the stock hoses are shaped to make the tight corners in the engine compartment, and, believe it or not, are different sizes on opposite ends of the same hose. I just bought a couple big chunks of hose and forced them to fit, but they are a bit kinked in places. Not an ideal solution. Removing the heater core is also a pain because you have to go throught the dash to get to it.
So my advice would be to get a Haynes manual and follow the procedures for the following: drain the coolant, flush the cooling system as per the instructions to clean out any scale or debris clogging small passageways, replace the radiator hoses and heater hoses with new ones (you can get the radiator hoses at any auto parts store, but I'd recommend just going to the dealer and getting the factory shaped heater hoses, it's easier and better, though more expensive), refill system with new long-life coolant and purge air from system. As a preventative measure you may also wish to replace your thermostat while you have the coolant drained and the hoses off.
With any luck all this may improve the coolant flow through your heater core and make the air come out hotter. If it doesn't work then you may have to replace the heater core, which isn't too hard but takes some time and patience. In any event, flushing your cooling system and repalacing your hoses is good maintenance and good insurance.
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post #8 of 10 Old Jan 30th, 2007, 01:01 PM
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Or, if all the above doesn't work, you could try removing the heater core and having it cleaned out at a radiator shop, which would probably be a bit cheaper than replacing it. However, the core isn't all that expensive, and it's such a pain to take it out and put it in that I might be temped to just replace it with a new one to prevent any future leaks or problems.
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post #9 of 10 Old Jan 31st, 2007, 08:55 AM Thread Starter
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Well, looks like I don't have to deal with the heater core anyways. I changed the thermostat and flushed the collant system......problem solved. Thanks again!
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post #10 of 10 Old Jan 31st, 2007, 08:58 AM
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No problem. Glad it worked!
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