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First chek temp on Dashboard if half or more ok if not you thermostate open. Next ok chek heater hose in end outlet hose if temp big diferent you have problem. Posible plug or only parsoliplugd heater but older model used valve not air mix dor chek. And other bad bad you have head gasket problem presser build and no water got heater coil only air. If no presser and start engin and hoses get fast hard not hot you have problem . I hope help you.. Mitsubishi 1990 big is you head gk
That is because ur engine needs to warm up first more so in cold weather u need to slow the engine to warm up there is a therm stat in engine and wont open till its up to temp thats all the prob is so dont worry and give ur engin a chance to warm up first
Heater blowing cold air,indicates towards low or no coolant or the coolant flow is getting obstructed or the heater core is clogged or hot to cold moving flap/ door is stuck in cold mode.
There are many possibilities, that needs to be checked.
Click the link below for step by step details:---
http://technoanswers.blogspot.com/2011/10/heater-blows-only-cold-air.html
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This should help.Thanks.Helpmech.
your heater isn't shot, but it might be clogged, in car the heater core is what proved heat to you in the car. The core is connected to the cooling system of the engin. over time it becomes clogged by the stuff that is in you coolant. a way to fix this yourself is to take off the two hose that go to it and using a air compressor and some water to blow it out, make sure the air is at a low psi. and then make sure to run water both ways through it. the heater core is just a small radiator. so to much force could break it, start going in the return hose to help get the debre out. Just be careful!
Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.
Steam coming through the air vents indicates a leak in heater core. The heater core is like a small radiator that is used to heat the inside of your car in the winter time. The blower, blows air through the heater core and into the inside of the vehicle. The steam you are seeing is the hot coolant leaking from the core.
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