I've got a 90 SE that I bought as a winter driver. The problem is it doesn't throw heat. At best it will throw lukewarm air. I've checked the heater core and it is clean and open. Oddly, if I take the lines off of the heater core and leave them hanging in the engine compartment (straight up) and start the car no coolant comes out. Obviously if there is no coolant flowing, how would the heater core ever heat up, but I don't understand how there couldn't be any flow??? The temp gauge on the dash shows that the engine warms up and I've replaced the thermostat. Any ideas would be appreciated... a winter car without heat really sucks.

 

bleed the system.
the procedure is in the stickies.
BTW you have a 39" car I believe

 

Your car is a summercar...

The main water valve is vacuum powered, electronics controlled. Check vacuum & applied voltage to the valve, under the hood... and bleed as said already, for example by driving one hour over 2000rpm while bleed screw ajar.

To get a winter CAr,
see: http://www.cardomain.com/memberpage/748507/7

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What is a 39" car?

I don't believe it is the vacuum valve, as that is external to the engine. I have had the hoses that connect to the hard lines on the engine disconnected and there still is no coolant circulating. I really think it is something internal to the block/cooling passages.

I will try bleeding for an extented period of time and see if that helps...
I've looked through the stickies, but still can't come across the one that details the coolant system bleeding. Can someone point me there?

Thanks

 

Btw. Youre not the first one telling this. If I understood right, you took the hose off before the valve, and did not get any flow?

Some say that pump blades has been rusted off. But cannot see how that would not result in engine overheating.

Maybe the seal or smtg else is blocking at the thermostat assy?

see also: http://www.cardomain.com/memberpage/748507/8




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a 39" car is the early 3rd gen maximas that don't have a bleeder valve, you are supposed to lift the front end of the car 39" up with the radiator cap off and the car running to bleed all of the air out of the system

 

Has anyone with the no / little heat problem replaced that vacuum valve on the firewall and noticed more heat?

 

easy bypass tst is to disconnet from the valve, attach the hoses together with a hose joint connector.

 

really? I'll try that tonight. Thanks!

 

Yeah... I took the hose off before the valve. I've disconnected both hoses and started the engine expecting a large amount of coolant to spray out, but there isn't any flow from the engine in the heater core circuit. I've taken old speedometer cable (flexible wire... similar to what plumbers sometimes use to clean drains) and ran it into the tubing that runs in the V of the block toward the water pump. The cable goes in all the way to the waterpump without obstructions. It has me quite baffled.

I will try bleeding the system better once I get the car put back together again (currently apart awaiting injectors). My other option is since the engine is half apart to take the water pump off and inspect. I really didn't want to put this much effort into my winter car, but it is kind of intriguing at the same time. If I don't get it fixed the car is going up for sale... because a winter car without heat is a cold ride!

BTW... 39" raised in the front to bleed the coolant??? Is this for real? That's the craziest thing I have ever heard...

 

...to me that method tells of desperation, I suppose ti works as air wants to be on top...

Driving one hose loosened [barely leaking] gives air chance to escape. Needs good circulation 2000rpm or more and some time. But then, u need a working pump.

 

only happens on cars where the heater core is higher than the t-stat or radiator cap.
but that is the actual FACTORY Recommended method for earlier ones.

 

I bet the de signers have been pretty desperate while explaining this to the FSM manual editor... like being totally lost fighting each other on the TPS full open throttle switch -documentation.

 

had same problem no need to lift 39'' anymore nissan dealers have made a speacial funnel for removing air our of system(friend works for them)drain and refill with funnel and all air is gone. also heater **** can be stuck its a small cylinder shaped mech on firewall net to brake booster pull on a little lever a few times and it should work.

 

do you have said "special" funnel in your garage?

 

On my 9ton RV, I built a valved hose from the heater core bleeder valve. One gallon bottle in the end. Driving one hour with the valve ajar gets 100% all air out, and no problems ever after. Also no lost fluid...

 

9ton RV? Do they even allow such things in europe?

maxi1- are you referring to the control that is in the middle of the firewall that has the vacuum tubes going to it or something else?

 

Not in 'real' EU, only the hijacked Scandinavians can own bus size lookalike or whatever tonnage RV's as of today. ...How long it can cont as the nationalissumus sozialissimus advances?? Needs truck license of course. I had a double decker... Going euroholiday is nice: even all big euro city centers are blocked for cars but not buses. Never problim to find parking space... Even the milicia polizei politi guardia civil are speechless; how to behave right - iS tHAT bus or nobus, ticket or no ticket...bouhaha.

 

lol. I take it you're not a fan of the EU. That's hilarious that an RV is so rare that you can get it into places that are "bus only". Do people look at you as you drive by? How about the maxima? is that frowned upon with kyoto and everything?

 

? Do people look bus-RV - its like candid camera...

? a fan of the EU. - 70% are against it and its maniac nomenklatura: it tells what shape bananas are allowed, outlaws our lakes for swimming as they are 'too cool' etcetc sick regulations. In fact we were hijacked to this national socialist system [hitler won...] via treason [=most nations constitutions are just unlawfully bypassed]. From common people money earned , 90% ends to the state coffers : love thy taxes... gas is 3x what u pay. The real jobless rate is above 30% (state secret).
? kyoto hoax: we have only one state truth, kyoto is incl because somehow the money ends up to certain accounts at cayman's...


Yes this is maxima forum: maxima is as rare as white elephants, its nice to use auto-kickdown and show the pwr for volvos trying to eh... - its like candid camera...

Its funny how the 90's about 300 maximas were annually sold. Nissan subsidized its price artifically low (about -50%) to get that minimum sold for statistics purposes, but still people did not buy more. As we pay 3x the price of cars in US, the maxima price is about the same, even now. This 'population' base was used by Nissan to test & report their mfg R&D of the cars, as just abour every owner went always to stealeship maintenance regularly.