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Re: heater is weak
A couple likely causes:
1: the engines thermostat is stuck open preventing the engine from warming up quickly. If the engine temps read normal (warm) but the heater is still cool, then....
2. the Heater control valve (a valve that prevent hot water flow when you dont want it), may be clogged or malfunctioning. this is typically located on the heater hoses between engine and firewall.
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The heater works with the hot water of the car radiator, on colder days it takes the water sometime up to 15 minutes to get hot. The heater in the car does not use electric heating etc, the safest form of heating inside the car is done through a fan running over a water heated core.
Can you hear the blend door moving when you change the temp from cold to hot or vice versa? If not, then you need new blend door actuator. Also check the heater core for any blockage. (2 ways to tell....run the car til normal temp, and turn on the heat and feel the hoses by the firewall...if one is hotter than other, there is a blockage inside the heater core. Or disconnect both hoses at firewall, and put garden hose in one of those 2 open tubes and turn on the water...good flow or weak flow coming out of heater core tube? Weak flow means blockage) If there is a blockage, time to get new one.
weak engine, heat, engine coolant must be 180F or more at all times
hot. if not the heater will be weak.
unless you failed to notice the heater fan speeding up. that would
be gross 12 DC power issues, dead battery or, bad charge system.
you may have a problem with the heater core flap that allows coolant into the core. seems like there is just not enougg coolant going through the core. check to make sure the heat/cool selector is working properly.
take the test.
engine at or over 180F. (y./n)
full heat in other modes, (yes)
front defrost is weak.
weak front only,
1: recirculate is on, turn it off. (mixes cold with hot and net is warm)
2: damper failuire. (not going to defrost postion)
3: bad controls.
3a; some toys have a heater water valve, that i only opens 1/2 way
or is clogged. partially.
If your car is not blowing heat, then it means there is a problem somewhere. There are several causes of such problem like, low coolant level, open thermostat or the one that is too cold for the application, a defective heater control valve, plugged heater core, an ioperative airflow control or inlet door in the heater ducting or plenum, a defective blower motor, a pinched or kinked heater hose or a weak water pump.
Any of this might be the cause to the problem. Have a mechanic run a check on the car to know which is the fault, then I will be able to provide the step by step solution to the problem.
Take care and good luck. I hope this solution was helpful
generally **** has built up in the heater core to the point where it is so thick there is no transfer of heat or the core is just plugged. and i will bet that the dashboard has to be removed to replace the core so not really an owner serviceable item. what i did on my old 01 vitara was disconnect both hoses to the heater core, then i put a lawn hose on the heater core pipe end, one at a time, and blew **** out of it first one way and then the other. now bear in mind you could blast a hole through a weak point in the core, then you will be running without one. this hillbilly process restored some heat to the heater, in that and other cars,but it was not like a new one.
SInce your car is approaching 20 yrs of age, it's not surprising that the heater core could be clogged. I assume you have checked for a half-shut inline heater valve (if there is one.) HEre's how to test for the clogged core:
locate two rubber hoses going into firewall and clamped to two pipes protruding therefrom. These are your hoses to the heater core and the spouts running in and out of it. Disconnect the two hoses at some place convenient if not at firewall. Then run water hose into one of these tubes. If you have any backflow, or restriction, then you need a heater core.
If this is not a clogged core, BE SURE your hot/cold cable is pulling it's door or valve to the full hot position. Trace it under dash.