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No heat

Tiny
KELLETTJJ
  • MEMBER
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 166,000 MILES
Goodmorning, I have no heat but the engine heats up normal, think I have checked all fuses and they seem fine. Any ideas.
Sunday, January 3rd, 2010 AT 7:07 AM

44 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,702 POSTS
I need you to check something. Start the engine, let it warm up, have the heat on high, and feel both heater core hoses. They should both be hot. Could be a restrictive heater core or a blend door issue, Let me know what you find.
Joe

Go ahead and read this guide, it will help you figure out whats wrong

https://www.2carpros.com/articles/car-heater-not-working
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Sunday, January 3rd, 2010 AT 8:04 PM
Tiny
RANCHHOUSE
  • MEMBER
  • 11 POSTS
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
Pretty much like the subject says. The heater will work fine when dial is set all the way to hot, but when you apply the brake pedal the air turns cold, but doesnt allways go back to blowing hot when you take your foot off the pedal. Any suggestions. Ty in advance
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
Your heater core probably has a slight clog. Try flushing it out.
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
RANCHHOUSE
  • MEMBER
  • 11 POSTS
Ty I will give that a try. But do you think it could b electrical?
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
No, what is happening is when you stop accelerating your water pump flows a lot less since the engine RPM is lower. Since the coolant flow is a lot lower, it is a lot harder to get fresh hot coolant into the clogged heater core.

If you are idling, try revving the engine to 2500rpm, you should feel the air get warmer.
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
RANCHHOUSE
  • MEMBER
  • 11 POSTS
Ty, I see what your talking about and I just talked to the wife and she said it does when she slows down also, not just when the brake is applied so I agree and I will definately flush it. Thank you so much for your time
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
RONKIM
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 109,000 MILES
How do I determine if the water pump or thermostat is bad?
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Waterpumps usually are making funny noises or leaking. Or in some harsh cases seizure. On the other hand your thermostat you;'ll probably have to take a look at it and determine that. But they are usually stuck open or closed or even partially. If your having a heating problem your first look maybe your thermostat not allowing the coolant to circulate. Sometimes people don't even go through the hassle of diagnosing a bad thermostat, they just go and purchase a new one becuase they are usually so very inexpensive. And don't forget your engine coolant temperature sensor, those three items work together.
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
No problem.

Unforunately if flushing the core does not work then you may have to replace the heater core. However this sounds like the core is just slightly clogged so a good flush might fix your problem!
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
RANCHHOUSE
  • MEMBER
  • 11 POSTS
I will book it in to a rad shop so I will know it getts a proper flush. Ty
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
ADAM A
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 62,000 MILES
I have a problem with the van where it is over heating and its blowing out cool air. Please help
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Monday, January 28th, 2019 AT 6:19 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check for coolant leak
add as needed
check intake manifold gasket

need manual CHECK IT @
https://www.2carpros.com/kpages/auto_repair_manuals.htm
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
BRYON
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 157,000 MILES
N0 heat at idle, chevy venture 2003, heat only when driving vehicle, no heat at warm up, no matter how long I warm her up.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Does the vehicle reach normal operating temp? Are the heater hoses hot. Does the blower motor work?
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You may have a partially clogged heater core. You can try removing both heater hoses and pressure flush it with a garden hose.
Make sure the sure the system is topped off with coolant when your finished.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
FRANK M.
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET VENTURE
  • 3.4L
  • V6
  • FWD
  • AUTOMATIC
  • 196,000 MILES
Engine heats up fine turn fan on and only blows cold air.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check coolant level for being full then try pulling HVAC fuse inside car for sixty seconds with key on then reinstall might reset blend door actuator.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
JOHN CHEVY VENTURE
  • MEMBER
  • 1 POST
  • 2002 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 168,000 MILES
Have a 02 venture with spuratic heat in front, Little when idoling pretty hot when running hard or reving engine. Also no heat in rear no diffrence between AC or heat just strong cold air. Lines to rear are both Hot
I replaced T-Stat, next day flushed system, with rear hoses off also seemed to flush with power no water trickling. Also the front fan speed dial only works on 1, 2, 4(blower resistor bad) I just can't belive the Intake gasket is causing this condition. Please explain or a fix for this common problem.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Needing the rpms up to get heat from the front is usually a partially plugged heater core.You will want to be careful if you decide to flush this out yourself using a hose, it isnt that easy to replace it if it pops from too much pressure. The Dexcool (coolant) used in those vehicles would clog heater cores, fairly common issue as long as the cooling system is full with no air pockets.The rear heater could be the blend door (hot/cold door) not working if you have both hoses hot, that usually means the hot coolant is flowing in and out.You should hear a difference in sound in the rear assembly when going from hot to cold, if not the door isnt working. You will have to remove the interior panels to access the assembly to visually see why it isnt working.


https://www.2carpros.com/forum/automotive_pictures/1639_actuator_1.jpg

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Monday, January 28th, 2019 AT 6:20 PM (Merged)
Tiny
MAELSTROMMAGE
  • MEMBER
  • 4 POSTS
  • 1999 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 174,000 MILES
On the first cold day of winter (below freezing) our van temp gauge pegged out into the redzone and the warning light came on. However, the heater was not blowing warm air at all.

We took it in to a local shop and they could not repeat the problem. Carbon dioxide test came back negative. The shop did not want to change the thermostat because they had no idea what was wrong with it.

I picked the van up after work on a Friday and it touched the redzone on the way home. I had read something about there being two relays for the fans, so I tried turning the air on to override one of the relays and the temp started to drop immediately. However, still no heater. Monday got up early to fill the van up and check it out, it never overheated on the way to the gas station, but came very close. Still no heater.

I can find a lot of complaints about Chevy Ventures like this on the interent, but no one has posted a solution.
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Monday, January 28th, 2019 AT 6:20 PM (Merged)

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