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Heater works ok when parked ,no heat at all when driving

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  • r_dougie
    r_dougie Oct 27, 2012

    suzuki leanna

  • r_dougie
    r_dougie Oct 27, 2012

    heater woeks ok when parked, no heat at all when driving

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  • Suzuki Master
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Your thermostat may be stuck opened,causing your coolant not to heat up.Need a guide on how to do, then post your vehicles info.,year,make,model and engine size.

Posted on Oct 27, 2012

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2008 jeep liberty.has no heat,blower works, dealer changed water pump,checked heater core flushed lines.they say need cylinders/gasket heads redone replaced a dead battery3wks ago started after that


if cylinder head gasket blown --can have coolant being burnt and cause low fluid levels low or no fluid =no heat as well as overheating and can eventually blow the engine

Dec 08, 2016 | Jeep Cars & Trucks

1 Answer

My 2010 Jeep Liberty doesn't blow heat. I let the air out and the heater core is not clogged.


no engine stated, 3.7L or diesel or what?
i cant bet past let the air out.
ok, i get it, you burped all the air out , after draining all coolant
my guess, is the heater worked before, must i guess that?
my guess is this, (wild , lacking full story)
your heater did fail before (touching it) and you then drained the system
that was a wrong move. now you get to get all those air pockets out to land you back to square one, no heater, ok Ill pretend you did that, the book, on jeep cover this, read them>?
  1. guess, 2, blower blows fast on high,say in A/C mode.
  2. I check fuses, and they are ok.
  3. I then check fluid levels and ok, (at RAD)cold. only'
  4. I then get engine hot, it must reach 180F, degrees if not we wnext, the HVAC heat steals engine heat, so...IS NEXT.pg7
  5. now the HVAC chapter tells you to put the HVAC in to full heat mode fan on high, and check the 2 hoses that pass from the engine to fire wall to the heater core, for both same temperature and min. 125f (see chart in SM) ,at 60f outdoors
  6. if this test passes, above, then there is no need drain anything. landing use where, we land on HEATER FAILURE
  7. the failure of air to pass through the core, heater and that is caused by only 2 things (mostly)
  8. The blend damper motor is dead,
  9. or the controls sad damper are wrong.
  10. many jeeps have an HVAC self test, Ill now look up that for you, try I will. chapter 24 in the SM service manual.
page 2 in that chapter covers all tests.
see 2, that is the blend door.
if stick closed, this is the first thing to fix.
i see no HVAC self test, in fact the book shows only the dealer
scan tools above to test it.
I'd still scan the PCM to see if there are errors using any scan tool
that is always wise and always first. on any modern car.
1 is heat core, air must flow there, or there will be no heat.
no heat parked, engine hot, set to max hot, and both recirc and fresh air mode fail, parked . !!!!
26378224-rnpyahdtrv1qmkmm4ysa0nq4-1-0.jpg

Nov 29, 2016 | Jeep Cars & Trucks

3 Answers

Heater works great when driving goes cold at a stop light!! Coolant levels are fine and temp gauge is fine also.


so the fan is not working ? blower
or if that is ok, then the damper is stuck in fresh air
so that only moving makes? air flow.
seems the heater core is hot. all you need now is dampers right
scan it yet?

Mar 28, 2015 | 2001 Dodge Dakota

3 Answers

My 1996 honda accord doesnt heat up like it suppose to..unless its juss parked without any movement.. I drive it 2 miles away and it still doesnt heat up im concerned !! Any help ????


Thermostat stuck open?
Faulty temp sensor or gauge?
If heat comes out of the heater, engine thermostat is ok. That will isolate it to probably the temp sensor in the temp indication system (sensor & gauge).
The cooling system should be full. Temp sensors cannot read the engine temperature of steam or empty cooling galleries.

Dec 30, 2014 | Cars & Trucks

3 Answers

00' intrigue is over heating with ac on and parked. Any idieas why?


My only guess is either the temperature pressure switch is malfunctioning, or you have a leaking intake manifold. I would do a coolant pressure test on the radiator, put a/c on full blast while driving, or turn a/c completely off while driving. BUT, drive a good distance, when doing both. Release pressure before driving. As soon as you get back, do another immediate pressure test, then check your heater hoses under dash behind motor for leaks. This will put severe strain on the heating and cooling system as well as the a/c accumulator and condensor lines. Hope this helps

Jun 02, 2014 | 2000 Oldsmobile Intrigue

1 Answer

My 2009 Peugeot 308's heating is baffling me when i drive at normal speeds say 30 and above the engine temperature gauge never rises and the heater doesnt work but when im in traffic or parked with th


Thermostat may not be working properly, hot coolant has to circulate via the heater core in order to get heat. Normally operation temperation should be 180 to 200 degrees.

Nov 21, 2013 | Peugeot 308 Cars & Trucks

1 Answer

The fan works but no heat, when I parked it 2 yrs ago it worked fine


Ok, check to make sure the heater control valve moves when you move the lever to full heat. It would be rusted from being parked.

If that is OK, try draining the coolant, flushing the heater core by itself first with water, then blow it out with air. It is probably plugged. Then refill the system and try it again.

May 17, 2009 | 1992 Honda Accord

3 Answers

Heat works sometimes, jeep is running hot


Look for a vacuum leak.  There are numerous vacuum hoses that lead from the intake manifold to the firewall.  These hoses provide the vacuum necessary to switch the blower doors to the heat and vent position.  It is most likely a loose or cracked hose because the vacuum pulled by the engine is higher when driving, and at its lowest when parked or neutral.  This will make it work when driving but not when stopped. If all vacuum hoses in engine compartment are ok, you may have an internal vacuum leak inside the dash or from the controls, this will be harder to find without taking the dash apart. But, the common culprit is the vacuum hoses in the engine compartment since they are always always exposed to extreme cold or heat and rain or snow, which breaks them down over time.  If the vacuum hoses even look a little suspect, start changing all of them so you kill any possibility of other problems, as the brake booster is also run on vacuum.

Dec 24, 2008 | 2002 Jeep Liberty

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