Question about 2006 Toyota Matrix

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Toyota matrix 2003 heater heats badly and cools when engine speed drops. I suspect something in vacume control

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Heater heats badly and cools when engine speed drops<<<<?
DOES THIS MEAN HEATER NOT GOOD EVER OR IS GOOD WHILE ENGINE GOIN FAST?<<<<< THERMOSTAT




Heating GOOD OR DECENT GOIN DOWN THE ROAD but not at SLOW speed or stoplight
This is useualy a sighn of low coolant,as at low speed the Flow slows downand allows any AIR Pockets to Form thus causing
Heater NOT to GET COOLLANT, SYSTEM MUST be topped off with Temperture Selector dial ON HOT And ENGINE at Operating Temp-NICE & HOT this way cooolant fills all Voids and AIR. Pockets

IF there is a Bleeder Valve at TOP of Thermostat Housing then after first Procedure, Close System with Radiator CAP then Open Bleeder SCREW let it Flow till NO AIR comes Out then Close Bleeder screw Tight.

Posted on Jan 16, 2009

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Cab heater will not run cool when idling, but is OK when at speed.


Some cars have a vacume check valve on the vacume line that
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My 2003 Hyundai Matrix appears to be overheating but cools down when the internal heating system is turned on full. Is this the water pump failing?


not sure here without getting it hot and running my hands over the rad to see if its hot around the edges and cool in the centre where the fan is as this will signify a chocked up radiator but if its cooling with the heater on full blow then i would suspect a cooling fan fault ,as a water pump plastic impeller fault would not push the water through the heater matrix ,Also i dont think this vehicle has the plastic impeller but a metal one if my memory serves me correctly ,check the cooling fan electrics as iam sure this is a temperature switch fault

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Need to know where the fan motor and resistor is located on the 2003 Ford Focus. Car overheats while idling, driving, in park, and it'll still overheat when the heater is on. Tell me what site I can find...


Cars usually overheat when the thermostat is faulty, coolant level is low, or the water pump fails. If your cooling fan on the radiator does not kick on shortly after the engine reaches operating temperature, you may have a bad cooling fan, cooling fan relay, or cooling fan fuse. If your engine is overheating, start by checking the fluid level, and installing a new thermostat.

A blower motor resistor is the device that controls a car's cabin heating and air conditioning unit's fan speeds. This usually won't cause the engine to overheat, your A/C fan may not function or only function at one speed. Here is a Blower Motor Resistor from Autozone: http://www.autozone.com/autozone/parts/2003-Ford-Focus/A-C-Heater-Blower-Motor-Resistor/_/N-jk8uvZ91tag

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When we turn on our heater on the temp is fine but when we turn the heater off the van overheats.


You may have an engine cooling fan that isn't working. When you run the heater you are removing some heat from the cooling system which aids in keeping the engine cool. If the cooling fan in front of the radiator isn't working then the engine can overheat at slower speeds when there isn't any air being forced through the radiator by the forward motion of the vehicle. If this problem is happening only at slow speeds then I would suspect a cooling fan BUT if it happens at steady speeds over 35 mph you may have a different problem.Hope this helps and good luck!

Mar 07, 2011 | 1999 Dodge Caravan

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Engine heats up but takes a long time for warm air to blow. Once working, the thermostat works fine. Sometimes, warm air starts to blow and then goes cooler.


low fluid level or heater control valve may need replace..check hoses going to heater core...if cold...between heater control valve and heater core..replace control valve

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Not much heat if fan is on high, better heat on 2nd speed, rev engine to 4000rpm very good heat on high, Replaced thermostat, replaced water pump,same problem, waiting for gasket to dry before I rev engine...


There is air trapped in you cooling system. Applying vacuum to the cooling system with the engine off through the radiator or surge tank should extract the air pockets in the heater core.

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No heat from the heater


Let me add a new twist. My 2003 has a bad heater/A.C. control module. Try moving the fan speed from off to 5 as fast as you can, like 5 times then see if you have heat or not. I bet you do.

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It`s the heater matrix leaking.
It`s either corroded and burst or the pipes which feed it are split.
If you look under the hood, you will see two water pipes made from black rubber going into the bulkhead through to the inside of the car.
Remember where they are and look under your dash to find them.
You may need a torch,
let me know what you find
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Defroster and heat aren't working


hi from uk when engine temp is hot and heat set on max openhood and physically feel both heater hoses for temps ? if one is hot/warm and other cool ? then coolant is not circulating thro the heater matrix(radiator) as you have renewed most parts suspect without success? may i suggest your actual circulation thro the matrix is most likely to be the heater coolant valve which is elec operated as you turn the heat selector in dash both heater hoses connect to this for open/close to matrix of coolant so if valve is failed it is not servicable ? and not to difficult to locate if you follow h/hoses to heater ensure there is power to the actual valve b4 you consider replacing valve easy diy and not too expensive ? hope this helps you ?

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