Question about 1997 Chevrolet Venture

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2002 Chevy Venture-no heat.

This summer I had the AC repared,the rad replaced and the heater core replaced.Now I can only get lukewarm heat at best.I took it back to Canadian Tire and they told me I need new wheel berrings??? I told them to go to hell. I took it to a small shop and he got heat, but when I got home and went out later, no heat! He says it's the switch. My parts guy says it's the vacuum control? I'm freezing and getting very hot! Does any body Know what to do? Where is the heater core on these things? Thanks. Paul

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  • Paul McKechnie
    Paul McKechnie Jan 11, 2009

    A problem with the vacuum? That's it? Where in the vehicle is the heater core? If I can access it, I can probably set it to heat all the time 'til I can find a decent mechanic who doesn't have his hand in my pocket.

  • Paul McKechnie
    Paul McKechnie Jan 11, 2009

    O.K. Is the valve that controls water flow to the heater core at the core or elsewhere? I was told if I can open the valve fully and keep it open, I'll have heat.

  • Paul McKechnie
    Paul McKechnie Jan 11, 2009

    These are reconditioned heads and new gaskets.An air pocket sounds more like the trouble I'm having, but why do I get some heat sometimes(very little ) and cold air others?
    And one mechanic? says that when he revs the engine and plays with the heater contol he gets heat.He thinks it's the electronic switch. I was told that there is not an electronic switch! This is crazy. You watch. I'll sweat my *** off in summer!

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Most probably you have air pocket or worn radiator cap. To check:
When the engine is cool, and the car is sitting on a level surface, make sure the coolant (Dex-Cool) in the reservoir is at the cold level line. Also, remove the radiator cap and make sure the coolant is topped off to just below the cap. If any of these need to be brought up to the proper levels, do so.

Button everything back up and let the car idle. Turn the heat temp. all the way up and let the car run for several minutes. Gently rev the car in park (make sure the brake is set!) a couple of times as well. With the coolant topped off, the heat should blow hot even at idle. If this doesn't work, shut the car off and let it cool down for a couple of hours.

After it has cooled down, pop the hood and check the coolant levels again. The coolant level in the reservoir should be OK, but if there was air in the system you may need to add coolant again after checking under the radiator cap. Bring the coolant level back up, and button everything up again.

Start the car, set the heat temp. on high, and let the car idle/warm up one more time.

The whole goal with this process is to try to get as much air as possible out of the system and get the coolant flowing through again. You do not indicate which engine you have. If it is a V6, also make sure the radiator cap is an 18psi cap like what is installed at the factory.


If the radiator cap is 18psi, and the coolant system seems "full" after a couple of the aforementioned cycles, it may be something other than air in the lines. But the coolant check thing is something that can be done at home before paying a dealer/mechanic to check it out again.
Good Luck

Posted on Jan 11, 2009

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Hi
sounds like your low in coolant. this will cause an air pocket in engine and cause erratic temp readings/loss of heat check coolant in radiator when cold. and add
Comment posted on Dec 09, 2008you have an air pocket system is not bled out right or you may have combustion leaking into system via a cracked head or gasket Comment posted on Dec 09, 2008air pocket in the system Comment posted on Dec 09, 2008their are two bleed screws one at upper hose connector and one on pipe by water pump. need too open these and fill radiator not the overflow jug but the radiator. if you are getting combustion pressure in system then have other issues and your not gonna get out

Posted on Jan 10, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 10, 2009

    open glove box and open door in the back ,remove air filter and clean,then re install,and make sure to close the door tightly.


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The core is in the center of the dash near the bottom, behind and above the lower console. Remove the lower console and then the cover over the core. After disconnecting the heater hoses the core pulls straight out. The hard part is gaining enough access to remove the factory hose clamps. Partially disconnecting and moving aside the wiper linkage and the air filter housing will help make this area more accessible.

Posted on Jan 10, 2009

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  • 431 Answers

Ya..this would be the problme with the vaccum.

Posted on Jan 10, 2009

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