Question about 1994 Toyota Previa

1 Answer

Heater blowing cold air with coolant, fine with plain water

Previa heater blows cold most of time, kinda does what it wants and over heats at times, i flushed the system and it did fine with just water and cleaner, heater worked as normal. Now with coolant back in same problem occurs of not blowing heat just cold air most of the time.

Posted by on

  • arduepa Jan 23, 2009

    I have a similiar problem on a 94 Previa. Replaced bad waterpump. Ran well for 2 weeks. Flushed coolant system and added new antifreeze. Now the coolant won't flow and the coolant boils in a few minutes. Replaced thermostat but no luck. Any help appreciated. (billpardue@charter.net)

  • Anonymous Mar 27, 2014

    fan works but only cold air comes out of vents

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 11 Answers

It sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job

Posted on Jan 11, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Car heater blowing cold air


Sounds like ur ac pump is locking up its time for another one and also is your coolant level okay maybe ur heater core went out they dont give early signs of quiting they just go out

Jun 22, 2014 | 2000 Chevrolet Cavalier

1 Answer

No heat but blows cold air


flush radiator, check coolant level, check heater core, check timing, and if all tests fine get a compression test to rule out head problems.

Feb 07, 2014 | Hyundai Santa Fe Cars & Trucks

1 Answer

Heater blowing cold air


Check antifreeze,coolant,thermostat could be seized controls when engine is hot for heat

Nov 02, 2013 | Toyota Previa Cars & Trucks

2 Answers

1999 chevy silverado heater fan only blows cold air , both coolant lines in are hot


I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

Jan 10, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

1995 TAHOE BLOWS HOT AIR OUT THE VENTS DURING ACCELERATION


Did you mean the only time it blows hot air is under acceleration?

First thing check the coolant level in the radiator. If coolant is low the first hing to stop working is the heat.

If the coolant level is fine but the coolant is muddy I woulds suspect a plugged heater core. You can try back flushing it by removing both heater hoses (engine cold) and then use a garden hose to flush clean water through the heater core. Do this on both pipes going into the heater core. Keep flushing until the water runs clear. Re attache the the hoses, remove the radiator cap, start the engine, let the engine come up to temp and top off the radiator with straight coolant (to comp for the water in the heater core). You may have to repeat this process several times over several days but you should be able to get it cleared enough to get sufficient heat without having to replace it.

Nov 17, 2010 | 1995 Chevrolet Tahoe

3 Answers

2002 Dodge Ram 1500 - The heater blows cold air when it sits at idle but blows warm air when it is being driven down the road. A/C does the opposite, doesn't blow cold air when diling, but I figured this...


the heater blowing cold at an Idle and warm while driving it,is usually low coolant in the radiator,remove the radiator cap when engine is cold,fill to the top,and fill overflow tank to full,if that doesn't take care of it,check the heater hoses at an idle and see if they are both the same temp,it might be a water pump not doing its job.

Jan 11, 2010 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Once i start my car and turn on the heat, it starts blowing in cold air until i get on the road and accelerate more, then the heat starts coming. but once the heat starts it only lasts about two minutes...


Hi Jens,

Two things are happening.

The first is normal. Your heater gets its heat from the coolant ciculating in your engine. In order for it to work, the coolant needs time to heat up a bit. This is true of just about every vehicle.

When it gets cold again is the puzzler.

My advice is to check the coolant level in the radiator.

ONLY when the engine has cooled.

If the level is down, there can be times when there isn't enough water to cool the engine, fill the radiator and the heater core. The result is the heater blows cold air and the engine runs hotter than normal.

So check the coolant. Open the cap. Start the engine and top it off.

Then see if there is a change.

Best regards,
Mike

Oct 16, 2009 | 2003 Jeep Grand Cherokee

1 Answer

Heat blows cold when car is idling


You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.

Feb 02, 2009 | 2001 Mercury Villager

1 Answer

Heater bows cold when idling


Hya!
You need to bleed the cooling system.
To do this park on level ground, when cold remove coolant filler cap, start engine and leave to idle.
Have plenty of warm/hot water available, when engine reaches operating temp it may appear to boil over so keep away from coolant filler, top up with warm/hot water and wait as it may bubble over a few times before settling.
Replace cap and hopefully back to normal, Remember your Anti Freeze?
Good luck,
Paul 'W'
Oner~EDson(:0) {#><U.K.

Jan 16, 2009 | 1995 Nissan Altima

1 Answer

1986 VW Golf heater blows cold air


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 14, 2009 | 1986 Volkswagen Golf

Not finding what you are looking for?
1994 Toyota Previa Logo

680 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts

yadayada
yadayada

Level 3 Expert

63242 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21981 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...