Question about 1996 Chevrolet Blazer

2 Answers

No heat when temp goes below freezing, gas leak when tank is full

The heater blower will work when above freezing, but when below 30 degrees or lower I have no heat only heat from the motor. At times if I hit a pothole it will come on but not very often. I checked the connections and does not help.
I had a new gas tank installed 6 months ago. When I fill the tank I lose 1/4 gas when sitting and gas fumes. I've had the gas tank checked but they always insist I run out the gas to 1/2 tank or less, so they can drop the tank. Went to the Chevy garage and same thing, they cannot find a problem with the gas tank. I've been to 2 other garages and same thing. There has to be another problem other than the gas tank, any ideas as to why I'm losing gas only when tank is full? It actually melted the asphalt under the truck, Maybe cause I'm a woman and don't think I know what I'm talking about. Just very frustrated and and have spent too much money trying to get to the cause.

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  • neferu_1213 Jan 09, 2009

    Ok, as for the gas tank, I have taken it back to the garage and they did a smoke test and passed. I have no problem returning it as I have done. They even tried a gas sniffer but again the tank was not full, at their request. The gas tank has been dropped to find if this was the problem and told it was sealed.



    I had the radiator checked for antifreeze and this is not the problem.



    I belive I will need to return to the garage with a FULL tank of gas and they better get a bucket and mop. I will ask about the blower motor as well, I heard no noise either. The blower motor does not run at colder temps. If it's at least 40 degrees and up it will usually work. Just really odd that no one can find the cause.

    Thanks for replying

  • neferu_1213 Jan 10, 2009

    Thanks for the advice. Finally something that makes sense. And ohh I'm going to take the truck to the garage and leave it overnight, let them clean up the mess from the gas, hope it melts their asphalt. My dad taught me well, lol.

    Many thanks!

  • neferu_1213 Jan 20, 2009

    Ok I really have had it with this blazer. I went back to original garage that set the new tank and snapped a bolt and demanded the problem be fixed. He was even too lazy to go and and see the gas leaking and the fumes coming from the truck. Anyhow he tells me bring it back AGAIN and he'll drop the tank for another look. This is now my third visit to this garage.

    Now this is really a joke--I went to my local Chevy garage to have the heater blower checked-it was about 3 degrees and no heat. So was told it was blower motor which I agreed was most likely the problem. Was replaced, ran good for 2 days and on the way home today smoke started coming out of the vents thru the dashboard, was definately an electrical smell. Quickly turned off the heat and smoke stopped. This is unbelievable and unexcusable. I've decided I've had enough and this blazer is history. So thanks for your help, spent good money on nothing.

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  • Contributor
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Blower motor or heater core is bad and the gas problem could be over flow line been put on wrong just letting gas just come out of it when its full.

Posted on Jan 10, 2009

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  • Chevrolet Master
  • 6,982 Answers

The reason that the shops keep insisting on a low tank is because gasoline weighs about 7.5 lbs per gallon. It's too heavy to remove full. Aside from that, most shops just don't have a place to temporarily store that much fuel! You almost certainly have a leak on the top of the tank, either from the sending unit seal, a hose or the tank itself, which is why it only leaks when full. The location can only be determined after the tank is taken down and inspected. Though most warrantys cover 90days from when work is done, any reputable shop will usually correct this type of problem for free, Unless there was a problem they saw, told you about and you refused to allow them to correct.
With regards to your heating problem: From your post, it sounds like the blower motor may have failed.(going over a bump would free it up) However, the motor itself would have been noisy before it got this bad. I don't see a corrolation between ambient temp and that though. Is the blower running when this happens? Also, If you don't have a proper antifreeze mixture, the heater core could be freezing up, but this would generally correct itself as the vehicle warms up. With limited info, I would not rule anything out yet!
Good lucki

Posted on Jan 09, 2009

  • Richard Scordino Jan 09, 2009

    OK Something you can do (since for some reason everyone else is too lazy to do the right thing) Fill the tank, bring it home and since a blazer is pretty high off the ground, lie down under it with a flashlight (not a droplight), and look to see where fuel is leaking. Even a general area where you can direct a techs attention is fine. Don't only look at the tank...look at the lines & hoses that go to it, all the way up the chassis to the engine. The heater...It is possible that the brushes on the blower motor have worn out. This usually happens when the shaft bearings go bad but they may not have failed. I would run a length of insulated wire from the + side of the battery and directly connect it to the hot terminal on the blower motor while the blower is not operating correctly(if I remember correctly,the wire is usually purple). If the motor runs, then the problem is elsewhere. Don't touch anything else metal with the wire end... it will spark! I would do this also to establish a good ground, by repeating the same process only using the negative batt terminal and touching the other end to the motor case. I know that you are a wimmen! That dosen't mean anything unless you are really old and feeble! Do not let any shop give you a line of b/s... be informed and they can't do that!

  • Richard Scordino Jan 10, 2009

    Yup... And after this, find a more reliable shop. I ran a shop for a long time... treated EVERY customer as if they were family, Always backed up our work, and never "blew off" anyone. We maintained lower than a 2% "comeback rate, and half of that was crazy stuff like "you fixed my tire and now the radio dosen't work" (and I rarely lost my temper.)
    To "09"... It "could be" lots lof stuff. but, when did you ever see a heater core stop a blower motor? and when did you ever see an overflow lower tank level by 1/4 tank??? It's an overflow, not a siphon!!!
    Good luck If you have time, tell me what they found after it's fixed!
    30 yrs in business and still learning!!!


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