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2002 sentra


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#1 localmechanic

 
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Posted 01 December 2006 - 08:10 PM

So I get an 02 sentra 1.8L in for a overheating and no heat concern.Turns out that the thermostat was no good...that fixed the over heating..But still no hot coolant flow to the heater core.So I flushed out and in the heater core...........but still no heat.Is there something that controls the flow of coolant to the firewall??

#2 Aurora

 
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Posted 01 December 2006 - 08:21 PM

are the hoses from the core hot? I have seen the mixture door in the car break or the gear come loose, you may want to check that, does the heat control dial on the control panel operate smoothly?
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#3 greg's garage

 
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Posted 01 December 2006 - 08:34 PM

Check on the bulk head that the heater hose still go to the heater core, some times when the core leaks some shop reroute the hose to bypass the core or the valve is stuck closed. :angry: Greg :)
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#4 localmechanic

 
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Posted 01 December 2006 - 09:05 PM

the hoses to the heater core never get hotThe hot/cold selector seems to be working fine...i can hear the trap moving

#5 Aurora

 
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Posted 02 December 2006 - 12:06 AM

sounds like a flow problem, at least one hose should be hot, have you checked to see if there is sufficent pressure in the cooling system?
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#6 localmechanic

 
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Posted 02 December 2006 - 09:01 AM

Maybe I should do a cylinder leak down test .....the coolant level was very low when I got the car.At this point , even if the head gasket was faulty, I would not mind as long as I could pin point this problem!!!!!!!!

#7 Aurora

 
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Posted 03 December 2006 - 08:27 AM

even if you had a head probem you should still have heat at atleast the core. dont overlook the basic things before digging deeper :) you could also have a air pocket trapping the flow or a colapsed hose.
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#8 localmechanic

 
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Posted 07 December 2006 - 10:25 PM

Did not have any time this week to go deeper into the sentraBut I had to park her outside today, and just for fun I opened the rad cap(with the engine off and temperature cold) to see the level....and all kinds of air purged out.....litterally bubbling coolant....Previously, when I changed the thermostat and flushed the heater core,I filled the cooling system using my spill-free funnel. I'm pretty sure that I bled it good...Just thought that I would share my findings....maybe on saturday I'll put some time on it................

#9 bhekf

 
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Posted 19 March 2008 - 05:15 PM

I have the same exact problem with our 2002 Sentra. It has my mechanic going bonkers. Everything that was mentioned has been tried in the above posts has been tried at least twice (except the heater core was replaced only once). There is no hot water getting to the heater core. Both heater hoses remain cold (or cool). The head was pulled and replaced 3 times using a new head gasket each time. I bet the solution is simple. The only problem is what IS that solution. Any help will be greatly appreciated. Thanks

#10 da24tis

 
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Posted 20 March 2008 - 02:33 AM

This might help you. I am a Suzuki tech and I have had similar issues with the Verona's. I used the spill free funnel, combustion gas detection in coolant, etc. What fixed it in the end was a Airlift coolant tool. I had purchased it on one of the tool trucks for about $150. The tool hooks up to the radiator opening, you connect shop air to the tool and it sucks all the air out of the cooling system, then you connect a hose that feeds the systems with mixed coolant by the vacuum you created. Since then I've used the Air Lift tool on every car I do cooling system repair (t-stat, water pump, etc), saves time, paid for itself. If it's not air in the system from not being able to purge itself, this sounds like a head gasket leaking. I would do a combustion leak test on the cooling system if you have the kit.

#11 bhekf

 
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Posted 23 March 2008 - 08:44 AM

This might help you. I am a Suzuki tech and I have had similar issues with the Verona's. I used the spill free funnel, combustion gas detection in coolant, etc. What fixed it in the end was a Airlift coolant tool. I had purchased it on one of the tool trucks for about $150. The tool hooks up to the radiator opening, you connect shop air to the tool and it sucks all the air out of the cooling system, then you connect a hose that feeds the systems with mixed coolant by the vacuum you created. Since then I've used the Air Lift tool on every car I do cooling system repair (t-stat, water pump, etc), saves time, paid for itself. If it's not air in the system from not being able to purge itself, this sounds like a head gasket leaking. I would do a combustion leak test on the cooling system if you have the kit.



#12 Lemoninspector

 
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Posted 07 May 2008 - 01:39 PM

Look at that again- overheating............... Do you have coolant flow. Water pump moving the coolant? Did the impeller come of the water pump? Cool hoses- no flow or no water in the hoses. Did you use a Pyrometer on the engine and radiator?
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