1990 Maxima - heater problem.

You get enough air flow out of the vents?

You may have a blend door that's stuck shut that's keeping proper air flow from blowing across the heater core. If ya took the valve out of the loop you should have effectively put heated water through the core irrespective of what any lever on the dash is set to. It's merely a hose in and a hose out of the heater core after it passes thorough the firewall.

The heater core sits at an angle unparallel to the fire wall and angles such that you have to remove the box to slide it out of the blower cas.

Heebie Jeebie....Me

CH wrote:

Plugged/collapsed feed hose or return hose? Also could be air in system. There is a bleed screw on the cover with the V6-3000 on it. On top, right next to where the heater line comes out of that casting. That is the highest point in the system. Heater core location and orientation is such that system is hard to fill completely with fluid. Might also try removing hose at that point and investigating for obstructions in the casting. If, over a period of time, air has always been trapped in that area, there may be a build-up of crud enough to block the flow. Worth a shot taking a look. How is engine cooling overall? Does your water pump seem to be operating properly? Good luck. Bob

95 SE Auto 89 SE Auto traded

First off, if your temperature controls in the dash are operating correctly, then replace the coolant temperature sensor. It may not be sending the correct signal to the ECU which controls the fans and fuel mixture. Then, replace your thermostat. Lastly, make sure the heater hose valve on the firewall has the vacuum lines hooked up that controls the amount of coolant flow into the heater core. I did all these things to my 90 and it now heats properly.

Chris

Hi Chris,

did you have any problem with your radiator?

++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Chris H wrote:

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Hi Chris,

is it easy to flush the radiatior?

does the fan > No, I flushed my radiator and made sure the cap was able to hold the

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No, I flushed my radiator and made sure the cap was able to hold the specified pressure.

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Very easy. Disconnect the lower hose clamp.

I had a similar problem with my 1991 Maxima a couple of winters ago - the dashboard heater controls seemed to work only sometimes, and usually not at all. Dealer service recommended a new water pump. I thought he was crazy, and did nothing. After an overheating problem in bumper-to-bumper traffic the following summer I had the pump replaced, and the heater worked fine all the next winter. So the crazy dealer was right all along.

Hi Chris,

is the lower hose connected to the radiator?

does the fan in the nissan maxima 90 start automatically to cool the engine when it get hot?

bye Chris,

sincerely dan,

ps: can you please reply to snipped-for-privacy@netscape.net or snipped-for-privacy@yahoo.com

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Chris H wrote: