ZR8ED Posted December 23, 2008 Share Posted December 23, 2008 Help! My daily driver (honda civic) has just starting doing this. The car is fully warmed up, and my heater is putting out full heat, then for no reason, the heat turns cooler, and I can't get any heat. If I leave it alone, eventually heat comes blasting back. The blower keeps running as normal, it is just the temp that drops and then comes back. It just started doing this this week? I'm tempted to trade the car in due to mileage, and it is due for a lot of other maintenance. ie timing belt, bushings, windshield, 1 caliper is starting to sieze up, I need two new tires, a 4wheel alignment (hence the two new tires needed) and I need all the fluids changed due to age/mileage. Car is a 2002 with 224,000 km's It has lots of life left, but I drive 1000k per week, and I need absolute reliablity for my job. Any ideas? I may need to act on this in the next few days. Thanks, Scott. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 23, 2008 Share Posted December 23, 2008 maybe its an issue with the ducting... obviously the heater core can't be cooling down as long as your water temp gauge indicates proper temperature.... I think the ducting that opens and closes is malfunctioning.. so when you turn the heater on it might be mixing fresh cold outside air with the warm air that should be sealed from the heater core. give it a peak?! i dunno just tryin suggestions Quote Link to comment Share on other sites More sharing options...
Hyuri Posted December 23, 2008 Share Posted December 23, 2008 First things I'd check: blend doors (is everything connected firmly, uncorroded, etc.?) and heater control valve (is it flowing? is it being held open, or is it slipping shut over time?). Quote Link to comment Share on other sites More sharing options...
gwnwar Posted December 24, 2008 Share Posted December 24, 2008 Are your doors for the heating controled by vac. if so check all vac lines for cracks in e center of dashng compartment and under dash and control unit. Quote Link to comment Share on other sites More sharing options...
Dallas J Posted December 24, 2008 Share Posted December 24, 2008 You guys are thinking too hard about this. Id put money on low coolant. Quote Link to comment Share on other sites More sharing options...
tech9 Posted December 28, 2008 Share Posted December 28, 2008 if not valve, maybe core is plugged, i had this problem on a taurus and flushed core out and it was fixed. Quote Link to comment Share on other sites More sharing options...
turboboost Posted December 28, 2008 Share Posted December 28, 2008 You guys are thinking too hard about this. Id put money on low coolant. Ditto. Everyone always seems to jump to the most complicated solutions first. Quote Link to comment Share on other sites More sharing options...
zguy36 Posted December 29, 2008 Share Posted December 29, 2008 This is how I know when to add coolant, the heater quits blowing hot! Quote Link to comment Share on other sites More sharing options...
jasper Posted December 30, 2008 Share Posted December 30, 2008 First check coolant. If low top off. Check for extenal leaks. If engine temp (on guage) changes when problem occurs, possible head gasket. Also unexplained coolant loss is another tip off. NOT UNCOMMON. Quote Link to comment Share on other sites More sharing options...
ZR8ED Posted January 9, 2009 Author Share Posted January 9, 2009 Well the coolant level was fine, I suspect the controller in the dash is acting up. I managed to solve the problem though. I ditched the car and bought a new Sentra. Cheaper ins, new car and only 20$ per month more than what I was paying. I did some calcs on what was owing, and added up the needed and soon to be required repairs, and it just didn't make sense to pay that kind of money to drive an old highmileage car. I got an very good deal on it. I have lots of Nissan friends hehe Thanks all for the ideas! Quote Link to comment Share on other sites More sharing options...
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