Question about Cars & Trucks
98 windstar....if i turn on my heater it blows hot for a while then blows cold if i shut it off then back on its hot agin this just started out of nowhere today no worning
Can't be 100% sure without checking the van myself, but sound like a vacuum leak in the HVAC unit or a defective HVAC unit in itself. Even modern vehicles sometimes still use a vacuum pump and valves to operate the traps the take care of temp control, vent position, etc. A very small leak of vacuum would make the traps slowly return to original position when the pump shuts off, as normally the vacuum will keep the trap there until the vacuum is released. So a small leak would let the vacuum get released over time when no more vacuum is applied by the pump. Although i must warn you that just getting the HVAC unit out of the dash is a major job, let alone taking the HVAC apart to inspect and test... So you might want to either just replace it with a new one without testing, or have some else take everything apart and do it for you. Hope this helps :)
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
Check radiator fluid level. The heater core sets higher than the engine. If fluid gets low, air bubbles will go to the highest point. The heater core. Check temperature guage. Is engine warming up to normal range? If not change the thermostat. Also check radiator cooling fans with engine warm.
On my car if I set the heater control on anything other than "vent" both cooling fans come on and the engine will not warm up. (still haven't figured that one out) I just run the heater in "vent"
If heater warms up when engine is held at high idle(2000rpms) then cools down at idle, you most likely have air traped in the system.
Posted on Oct 11, 2008
will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks
Posted on Jan 31, 2009
Likely it has more to do with the door that controlls the airflow. Which should be operated by vacum might check and make sure all thevacum lines are plugged in.
Does the gauge in the car show it warms up?
Posted on Feb 24, 2009
Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.
Posted on Mar 13, 2009
That is usually the first symptom of low coolant. Not enough water in the system to circulate through the heater core. Has it been running hot?
Check the coolant level in the radiator
Posted on Sep 23, 2009
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