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Classic heater blows hot ans sometimes cool air then warm again????

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

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Posted on Jan 02, 2017

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SOURCE: heater on ford 2003 ford pick up blows cold air

on the evap box there is a control mtr that switches the hot cold door. these mtrs are prone to failure. the other problem that i have seen is that the door breakes in side the evap box and that means removing the box to replace the door . if i remeber correctly you may have to slide the dash back to gain assces to the control mtr to test it good luck

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: heater wont blow warm/hot air

check your radiator coolant, thats what I did and it blows warm again

Posted on Jan 15, 2009

  • 607 Answers

SOURCE: problem with front air switching to heat when accelerating

Check for a vacuum leak. WHERE is the magic question.

Posted on Mar 27, 2009

  • 66 Answers

SOURCE: The heater only blows hot air sometimes

it sounds like a bad blend door motor.these are controlled electrically and not with a cable like older vehicles did.

Posted on Oct 27, 2009

  • 1 Answer

SOURCE: Heater is blowing cold air. Could it be that my

Had similar problem. The actuator that opens & closes the air blend door quit working. This is easy to see if you remove glove box. The actuator will move when you adjust the temp selector (do this while the heater is running).

Posted on Dec 29, 2009

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2 Answers

Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it

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Jan 27, 2016 | 2000 Chrysler 300M

1 Answer

Heater blowing warm and cool air

Try flushing the cooling system. The heater core us probably clogged. A flush may clean it out. Good luck.

Nov 18, 2013 | 1994 Oldsmobile Ninety Eight Regency

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05 Avalance heater working intermitantly.

bleed the cooling system you have an air bubble in there.

Oct 05, 2013 | Chevrolet Avalanche Cars & Trucks

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How can i get the vents to blow cool or cold air instead of hot air

Your Heater tap is probably stuck in the on posision. This is in the engine bay. Not sure if yors is vacume, electric or cable operated. Temporary fix bypass the heater alltogether ie: put the hoses that go to the tap reroute to the motor

Jul 05, 2012 | 2010 Chevrolet Traverse

1 Answer

Heater does not blow hot air , only warm

it's possible that you have an air bubble in the cooling system and it will need bled. also possible that the heater core has a partial blockage.

Feb 05, 2010 | 2000 Dodge Caravan

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Problem with front air switching to heat when accelerating

Check for a vacuum leak. WHERE is the magic question.

Mar 26, 2009 | 1999 Lincoln Navigator

2 Answers

Nissan Altima no cool air blowing or hot air blowing

It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.

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Feb 24, 2009 | 2002 Nissan Altima

1 Answer

No heat just warm air

I think you are on top of your problem,,you dont need any one elses advice.
Complete rebuild of the cooling and heating system,, simple.

Jan 19, 2009 | 2001 Oldsmobile Alero

1 Answer

Heater blows cold air

With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

May 18, 2017 | 2005 Lexus SC300

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