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Why don't my gas gauge and my heater work in my 1989 cadilac divel

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Without testing hard to say ! Your gas gauge not working could be the gauge it self is bad or the sending unit in the fuel tank is bad or somthing wrong with the BCM body computer . Are you talking about blower motor not working ? The blower motor is controlled by the BCM . Do you know how to do electronic testing ? I don't know if this year does it or not but on some cadillacs if you push the off and warmer button on the climate control panel the vehicle will show codes or will go into diagnostic mode . Been a few years , i worked at a Caddy dealer back then .You can look at free wiring diagrams at After you enter vehicle info . year ,make , model and engine size under system click on HVAC then under subsystem HVAC controls will automatically show ! Click the search button , then click on each blue link one at a time . You will see the complexity of your vehicle . Body computer , climate control panel . All electronic ! Fuel sending unit is a input to the BCM ,from there it goes to the fuel data center .

Posted on Dec 20, 2016


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Wat would make my heater and gas gauge not work in my 1989 cadilac divel

the climate control in this vehicle is/was rather complex. This was one of the first years that tey went to computer controlled climate control and yes, they did have problems or glitches from time to time. One thing that developed very common was the blower running all the time. In most all cases, the ECC power module failed. I suspect this is where your problem lies. this module can? affect other items like fuel data display etc but i can not confirm 100%. I would start by replcing the ECC power module or some call it the blower control module located under the hood, near firewall, passenger side on top of the heater case. You can also unplug it to stop blower. I can not rule out the BCM ( body computer) but more common was the ECC module. The BCM is located on top of the heater case under the dash. To be 1005 sure, a shop can run through a series of diagnostic checks to determine what is at fault. By experience, the blower module has been the problem at least 90% of the time

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1 Answer

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Disconnect neg / grnd battery cable. Replace Heater Blower Resistor. This will allow the heater blower to operate correctly

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Go to fuse panel left of steering column. Ck to see if #17, 10A fuse, is blown.

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The ground wire is in the harness with the fuel pump and sending unit.
The sending unit in the tank grounds the gauge on the dash.

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1989 Saab 900 low level fuel light

You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!


Jul 10, 2008 | 1989 Saab 900 4 Door

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