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You need to figure out whats wrong by process of elimination...Locate the two heater hoses that come off the engine and go into the firewall (the wall behind the engine). These two hoses lead to your heater core (like a miniature radiator behind that wall) With the engine hot, feel the hoses (usually one on top and one beneath, on the left when you are facing the rear of the car) When the engine is hot, and BOTH hoses are hot, that means your heater core is plugged.(least likely). If that's the case you need someone to flush out the core, under preassure. The most likely scenerio is that one or both of the hoses are COLD to touch. This means the thermostat is not working right and needs to be replaced. A bad thermostat will not open and make your engine run "cold" which will also KILL your gas mileage. A good mechanic should be able to replace a thermostat without bankrupting you! Thiswould be the best and easiest problem you could wish for. Best of Luck!!

Answerlow coolant or a bad water pump could be the problem, but there was no mention of overheating so neither of those are likely causes. i suspect that you have a control problem. the heater core is encased in a box that has flaps on it to allow either air to flow over it(heat mode), or to bypass it(cool mode). if the flaps don't work for any number of reasons, and are stuck in bypass then you wouldn't get heat. and both heater hoses would be hot (not necessarily a plugged core). the first place i check on these is the heater valve. one of the heater hoses connects to it. its under the hood connected to the firewall and has a lever that is operated by a cable from the heater control. if the cable is disconnected and the valve is closed, you wont get any heat. the problem with this car is access to the valve is very difficult due to the size of the engine compartment and the overhang of the windshield support. probably best left to a mechanic. Answersame problem in my 2002 celica, quart and a half low on antifreeze, lots of heat now
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โˆ™ 2011-09-13 10:42:02
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Q: What do you need to do to fix a 2001 celica gt that will not blow out heat but the fan still blows out cold air?
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