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Chevrolet Equinox, Electrical, Engine, SUV
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#624 of 1701 Poor Mileage and Heat
Nov 30, 2005 (6:33 pm)
I've had my 2005 Equinox for over a year now and have had several seemingly unrelated problems with it. My biggest concern is the poor gas mileage, but I may have stumbled onto a possible cause and wanted to see if anyone else has experienced the same problem.
I noticed recently that when I turn the heat on in the car when in park or stopped at a light, the tachometer goes up about 300-400 RPMs -- the same amount it goes up when the air conditioning compressor kicks on. I understand why it would go up when the a/c or defroster are turned on, but it shouldn't go up by just turning on the heat.
My gas mileage has never been good (about 20 or 21 mostly on the highway), but since I've been using the heat, it has dropped to about 15. Could the increased RPMs cause this sort of a gas mileage drop? My local Chevy dealer doesn't seem to know what to do with this information.
Can anyone help me with this? Thanks!
#625 of 1701 check engine light
Dec 01, 2005 (3:58 am)
i only get about 200 miles to a tank of gas in my 2006 Equinox its not the awd either. i really didn't pay attention to see if its worse now that i have to use the heat everyday im going to check now thanks. i have 4100 miles on it and the check engine light is on and wont go off, i just had an oil change about 1000 miles ago and when i checked it this morning it was making a clicking noise any one know anything about this, my dealer told me that i have to wait 2 days before they can see it since its not a flashing light its not a big deal they told me. Can anyone help? Thanks
#626 of 1701 Re: Poor Mileage and Heat [loumanuta]
Dec 02, 2005 (1:43 pm)
On the Equinox HVAC system, when the right knob is set to floor, defog or defrost mode, the system turns on the A/C compressor automatically (and raises the RPM's). With right knob in any of these positions, the A/C button and indicator light become a useless decoration. You can push the button to turn the indicator light on and off (giving you impression you are controlling the compressor), but nothing happens. There is no way to turn off the compressor in these modes. The A/C button controls the compressor only when the right know is set to vent or bi-level mode.
To get around this during cold weather, I set the right knob 1 position to the left of the floor mode icon. Most of the air goes to the floor and a little comes out of the dash vents.
I have a 2005 LT FWD since June 05 and have averaged only 19 MPG with mixed city/hwy driving. MPG has dropped to 18 MPG with the cold weather due to warming up car a few minutes in the morning to remove frost from windshield.
#627 of 1701 Re: Poor Mileage and Heat [sgr5516]
Dec 03, 2005 (6:41 am)
Thanks for the explanation. I had never heard that before. Is this something unique to the Equinox?
Before posting, I even tested it on our 2005 Pontiac and with the heat on and the directional dial pointed to the floor, the RPMs don't increase. On that car, the RPMs only increase when it is put into a/c or defroster mode. I thought that was the case with most cars.
It seems your gas mileage is just as bad as mine. I was hoping I had found the reason for my sudden drop in gas mileage, and I guess I did.
#628 of 1701 Re: Poor Mileage and Heat [loumanuta]
Dec 03, 2005 (2:41 pm)
I was surprised too to find out the compressor runs with the knob on floor mode on the Nox. This was discussed in earlier Nox posts and it is mentioned in the owners manual.
No other car I've ever owned forced the compressor on. I guess the Nox design team felt that customers would want the compressor on in any mode that directs air to the windshield. Since floor mode does direct a small amount of air to the windshield, they turned on the compressor.
I also have an 04 Malibu Max LS and the HVAC functions are way better. In vent, bi-level and floor mode you have control of the compressor using the A/C button. In defrost/defog mode the system turns on the compressor.
The A/C indicator light works more logically. If the system turns on the the compressor, it also turns on the A/C indicator light and does not let you turn the indicator light off. If the light is on the compressor is on, if the light is off the compressor is off.
Regarding mileage, check out post #4062 on the Malibu Maxx forum. Someone gave a good explanation of why mileage decreases in colder weather.
#629 of 1701 Re: Poor Mileage and Heat [sgr5516]
Dec 04, 2005 (7:26 am)
Thank you so much for the information and the heads-up from the Malibu Maxx discussions.
My gas mileage has been incredibly disappointing since day one, especially in the winter. I was hoping I had stumbled onto something that could be fixed or replaced and begin getting somewhere close to the EPA estimates. Unfortunately, that was just a pipe dream. At least by keeping the HVAC on bi-level, I won't make it any worse.
#630 of 1701 Re: Equinox Odor [snowman]
Dec 04, 2005 (6:09 pm)
I know your post is from a while ago, but I have a 2005 Equinox. So far its been in the shop over 16 days for faulty gas guage, cracked windshield, and moldy horrific odor. I've only got 2,300 miles on the car. The odor is the worst. Its a very earthy moldy smell. Dlr said its from a leak under the car. Leak was fixed. Also, coolant system is suspect. Coolant was flushed, and all new hoses installed. Finally all carpeting was replaced. Smell still remains. I fear air quality may be hazardous. Help!!!
#631 of 1701 Re: How soon will smells be noticed [everfeb]
Dec 04, 2005 (6:24 pm)
I have a horrible smell in my Nox. Its obNOXious. Moldy. Acrid. Unacceptable. Dlr replaced carpet, changed coolant hoses & flushed system. Also found body seam w/ leak and fixed the leak. Still an absolutely foul smell. Any clothing caught in my Equinox must be sent to cleaner. I am worried about environmental concerns relating to air quality.
#632 of 1701 alcan, axle ratio
Dec 05, 2005 (9:35 am)
Do you know the axle for the Equinox, I can't seem to be able to find it on the GM site.
#633 of 1701 Re: alcan, axle ratio [gonogo]
Dec 05, 2005 (7:11 pm)
If I remember correctly, final drive ratio is listed on the window sticker. I checked www.gmbuypower.com and looked up various FWD/AWD models, all trim levels, both 16 and 17" wheels. All the stickers said the final drive ratio was 2.70.
TSB 04-07-30-031A describes operation of the AF33-5 Aisin transaxle. the gear ratios are (1st) 4.685, (2nd) 2.942, (3rd) 1.923, (4th) 1.301, 5th (1.000).