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I am a class (A) mechanic.... Here goes easy steps to tell what the problem may be. A heater core has an in and a out. if one hose is hotter than the hubs of hell then the engine is doing its job but if the other hose that goes into the firewall is cold but the bypass hose that connects the two hoses is also hot then their is a blockage in the heater core usually from poor maint or a damaged water pump. easy fix is take both heater core hoses off then the steel hoses that comes out of the firewall delicately put a garden hose on the one side hold it the on high pressure see if the water comes out the other hose fast if not then try putting the garden hose on the other side on high pressure see if water comes out if not or just trickles then you have a blockage keep flushing it till it pours out quick. once it pours quickly problem should be corrected. Now if it pours out from the first time you put the garden hose on then its not a blockage. step 2 leave both heater core hoses off and put thgem up in the air try to put them as high as possible using something to prop them up so the coolant has to defy gravitythen start the car quickly look at the hoses if one of the hoses is pouring antifreeze at a high pressure rate then your water pump is good but if your hoses are trickling coolant out then either there is no coolant in your engine left or water pump is bad usually the pump fins corroide. but if the coolant is pouring out then its the actuator failed usually this happens if their is a vaccum leal or the actuator plunger has malfuctioned in any case first you put the control to floor if it switches to floor then put control to vent if it switches to vent put it to defrost if all works then vaccum system is ok and replace plunger or actuator. |
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