Question about 1987 Toyota Cressida

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'87 cressida. No heat: New radiator, fresh coolant, coolant level good, Reverse flushed the heater core. Under dash I can manually move the actuator lever and get heat. When I slide the dash control to cool, it moves the lever below to cool. When I move the dash control back to warm, it barely starts to move, but the lever\actuator will not move back to hot without manually pushing on it. It also goes automatically to cool when the car is shut off. It's fed from vacuum line #3, and I couldn't find any visible leaks in the line, and when I manually move the actuator, the valve on the firewall in engine compartment opens. What next? If it's the slider dash temp control that's faulty, is there a way to jumper a wire or something to directly control the actuator to go to heat? I'm told from the dealer that they no longer carry any of these heater parts.

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  • Toyota Master
  • 1,837 Answers

Try changing your thermostat. A bad thermostat will not let the fluid heat up. if its your controls your cables might be stuck so they won't operate. Maybe need new control . Maybe try a used auto wrecker to get used parts if you can't buy new.

Posted on Mar 14, 2017

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Posted on Jan 02, 2017

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SOURCE: Heater won't get hot

change your thermostat, its stuck open. I had the same problem and now I have heat!

Posted on Dec 19, 2008

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SOURCE: 2005 highlander heater problem

I'm glad I could help. I'm reposting the solution below in case anyone needs it in the future. Please be sure to rate it for me!

Pull the temperature knob off and verify the thin 12mm nut is installed and tight behind it. I have seen several of these loosen up allowing the knob to turn but intermittently have no effect on temperature.

Posted on Sep 11, 2009

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I get very low heat i have flushed system completely new radiator, thermostat, radiator cap, still no heat whats left?


Check to make sure vents are not clogged,below window by wipers check that and vents from dash going down,If not plugged then probably your heater core or heater blower motor may be shot or weak,you need a Haynes manual to check these if you are not familiar with where these are located at.Haynes manuals can be bought at most auto parts stores

Oct 31, 2014 | 2004 Jeep Liberty

1 Answer

No heat while idling


I have had a similar situation myself and it was my heater core, on my vehicle it was a very time consuming job as i had to remove the entire dash to get to it. What you could try first if not tooo bad . Flush the system and reverse the hoses on the heater core and reverse flush. You can drive reversed for short time with the heater core hoses reversed as i did for over a week it may un plug if not as bad as mine was....Plenty of how tos on u tube to reverse flush your heater core and system.. I replaced my heater core radiator and water pump and a vent was broken in the dash i found and bad vacuum lines. a couple actuators were bad. had no heat to floor after doing all that it roasts me out of the truck, and the vents work properly including blowing on my feet the way i prefer.... Hopefully this helps you

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2003 f350 diesel no heat


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Heater stop working


Check you other question. I just posted this.

Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

Feb 14, 2012 | 1999 Mercury Sable

1 Answer

Heater doesn't work


Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

Feb 14, 2012 | 1999 Mercury Sable

2 Answers

Heater only blows cod air even when engine is warm. changed thermostat. doesnt fog up ad smell like haeter core.


Your car's heater is a life saver in cold weather. Before attempting to repair your car heater, you should understand how your heater system works. First, on this page is an explanation of how the car heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, the heating system makes use of excess heat from the engine internal combustion process. A car's engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car's cooling system that removes that dangerous excess heat. Some of the excess heat is released through the exhaust. Most of the excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at the car front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into the passenger cabin. Because your car's heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system. The heater core in your car is similar to the radiator in the front of your car; in fact it looks like a small radiator. The difference is the heater is mounted inside the car and air is blown through the fins of the core. The heater hoses transfer engine coolant from the engine to the heater core, this allows the heat from the engine coolant to be utilized and warm the passenger compartment. When a heater stops functioning determine what type of failure has occurred to execute a repair. We have listed the most common problems below:
heater_core.jpg
Heater Core
Troubleshooting Procedure
  • Step 1: Check Engine Coolant Level - Most cars have coolant reservoirs with opaque white plastic tanks and measuring lines allowing you to see if the coolant is at the recommended level. Coolant expands when heated, and for that reason, most coolant reservoirs have a Full-Cold and a Full-Hot line. If there is too little coolant in the reservoir, you should be alerted to the possibility that there could be a leak somewhere in your car's cooling system. Remove the reservoir cap and add coolant to the Full-Cold line, if a very short time after you refill the coolant reservoir the coolant level is low, there is a leak in your car's cooling system. Engine coolant is used to heat the heater core and if the vehicle is low on coolant the heater core will stop working. The heater cannot produce heat due to the lack of heat from the engine coolant. Even if the engine is not over heating the coolant level can still be low. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the vehicle is cold, preferably over night. Check for engine coolant leaks and repair as needed, then refill with coolant and recheck the system.
    radiator_cap.jpg
    Radiator Cap
  • Step 2: Inspect Heater Control Valve - The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced. After the repair has been made refill the coolant level and recheck system.
    heater_control_valve.jpg
    Heater Control Valve
  • Step 3: Check Vacuum Feed - Most heater systems are operated by engine vacuum. This vacuum is used to actuate servos to move the temperature adjustment doors inside the heater plenum. If engine vacuum is not present the heater will not operate properly. To test for this condition remove the vacuum feed line from one of the vacuum servos. With the vacuum feed line removed insert a vacuum test gauge. If no vacuum is present, open the hood and inspect all small vacuum lines from the engine to the firewall and repair as needed. If a hissing noise is present under the dash when the engine is running a vacuum leak exists and must be repaired to restore heater function.
  • Trouble Shoot Heater/Air Conditioner Blower Motor. An electrical motor is used to push air through the heater and air conditioner system. If this electric motor fails it will not force air through the system. Ground a test light lead to a good ground source, like a metal brace under the dash, seat mount bolt or under hood brace. Turn the key to the on position; check the fuse in the heater or blower motor fuse panel with a test light. Then lightly touch the service port at the top of the fuse on both sides. If the test light illuminates on both sides of the fuse, the fuse is ok and working properly. If the fuse lights the test light on one side it is blown and needs to be replaced. fuse_panel.jpg
    Power Distribution Center
    If you are unsure of the location of the heater fuse consult a repair manual. If the fuse condition is ok, position the blower speed to the highest setting. Connect the ground end of the test light to a known ground source. Then probe both ground and power feed wires of the fan motor. The test light should illuminate on only one of the wires (fan motor failed). If the test light illuminates on both wires the ground source has shorted. If neither of the wires illuminate the power source is shorted. To trouble shoot this style of problem a wiring schematic is needed.

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2 Answers

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My heater isnt working. I've replaced the radiator the water pump checked the heater core and flushed the system and it still doesnt work. Where is the heater door actuator located? and also I heard the...


The heater guard actuator is located under the Dash area. It sounds as if you covered most all of the issues regarding system procedure... It could be as simple as one of the vacuum lines have come undone or the cable has slipped .

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you need to get under the dash board and remove the passenger lower kick panel. ther will be a small motor bolted into the evaporator housing. remove it and manually move the blend door. if the heat gets hot the you need a blend door actuator.

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Hi There, If the fan blows only cold air, then you might have a restriction on the heater core. The heater core is like a small radiator inside your dash. The coolant flow through it can be restricted by corrosion. The lack of flow of coolant through the heater core will result in a lack of warm air inside the car. Flushing out the heater core may help. If not, you will have to replace it. I would say though, 80% of the time the cause is just restriction. Get the heater core flushed and I am sure you will get your heat back. MIke

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