Question about 1989 Nissan Stanza

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Heater blowing cold and over heating

Everday i put 1/2 gal - 1 gal of coolant in my 1989 nissian stanza. I leave the rad cap off & watch the water with the car running it is not circulating nor is it spitting out at me.I then put the cap on & let it idle for 20 mins with heater blowing (cold air) fan does not come on & as long as it's just idling it does not overheat. When i drive if i turn the heater on it blows cold & the gauge starts to move toward hot I then turn the defrost on &it cools the car down to nor but still air coming out is cold. When I shut the car off I hear a hissing sound back by the firewall but see no steem or coolant. I open rad pressure cap and can hear bubbling hot water going into resevior and hissing quits what is wrong with my car?

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Start by finding out wherethat half to 1gal. of coolant is going every day,wich is a major loss,and repair it,

Posted on Feb 26, 2009

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Hello , sounds like an air lock in coolant system , drain system and re fill very very slowly , if you think you are filling it slowly enough slow it down even more , also replace thermostat to ensure its opening and closing properly , hope this helps

Posted on Feb 26, 2009

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Temp gauge and computer says car is hot but water in tank is cool


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could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
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