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Old 10-12-2018, 06:55 AM   #1
Waiex191
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1999 SL2
1998 SC2
Default Poor heat from the floor vents

When I bought my SL2 new back in '99, there was one thing that was better on my old Dodge Omni. The Omni had awesome heat on the floor - you could feel it on your feet. Today I drove my '98 SL2 for the first time in near freezing temps. It was as good on my feet as the Omni. The '99 has plenty of heat, I am thinking there is an air diverter problem. My search attempt found a lot of Vue info, but no S Series. Anybody have experience working on the vent system that would help explain this?

...
Bryan Cotton
'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018

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Old 10-12-2018, 10:11 AM   #2
cgg17
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1995 SL2
1999 SL2
Default Re: Poor heat from the floor vents

Does the recirc work? I dont know if that has anything to do with it, but it may. According to my 1995 owners manual it is supposed to have the max heat at the feet too.

...
1994 Sl2 5spd: 56,576 (Totaled 1/10/2018)
1995 Sl2 5spd Manual Swap: 150,062
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Old 10-12-2018, 10:25 AM   #3
onlinebiker
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Default Re: Poor heat from the floor vents

What is your temperature gauge reading?

It should be about 1/3 of the way up, between 1/4 and 1/2.

The gauges are amazingly consistent. I have yet to see one that reads wrong.

...
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93 SC2
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Old 10-12-2018, 10:46 AM   #4
Waiex191
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Default Re: Poor heat from the floor vents

Recirc works. Temperature is above 1/4 both with the new thermostat after rebuild and the old one as it came from the factory. There is plenty of heat, just not on the feet.

I drove the '98 in today without recirc, but with toasty feet.

...
Bryan Cotton
'99 SL2, 5SP bought new
Rebuilt at 204,067 September 2017
Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on!
'98 SC2, 5SP bought 2018

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Old 10-12-2018, 12:45 PM   #5
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Default Re: Poor heat from the floor vents

Waiex191, can you verify cooling system temps with a reader, hand held infrared temperature probe or thermometer inserted into the coolant container? Once system temps are confirmed above 190F, you might have to examine the hvac controls and hvac box. For whatever reason, I'm unable to upload drawings. Perhaps later.

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Old 10-12-2018, 01:42 PM   #6
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Default Re: Poor heat from the floor vents

Here are some drawings.
Attached Images
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Old 10-12-2018, 02:23 PM   #7
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1998 SC2
Default Re: Poor heat from the floor vents

Look up high on the left side of the HVAC box and watch the linkage as you move the slider from far left to right. Watch the damper arm on the damper closest to the rear of the car. Check that the carpet has not managed top block the flor outlets which it can do easily.

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Old 10-18-2018, 07:02 AM   #8
Packard
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1995 SL1
1995
Default Re: Poor heat from the floor vents

The higher the gauge the better the heat inside cabin. If your thermostat is stuck at 1/4 your thermostat is an issue I recommend replacing with
So, what does the manufacturer print on the box? 188F or 195F or 212F, there is no standard established by ASME, ANSI, SAE, or some Federal Bureaucracy so they tend to drift around based on the phase of the moon and/or the prevailing wind. The STANT is at least marked for cartridge rating which helps. It is also very fine print and not on the box.

I RECOMMEND PICKING UP THE 188F FOR YOUR vehicle 212 f would be to high for summer ppl with higher ones will overheat in summer heat may be find in winter but for a good all around 188f has done me good here in texas 110 weather . My gauge goes about between half and 3/4. Then you should hear the fan kick in.
Also Since using the stant 188 f Ive noticed less gas out the tailpipe Im noticed a big improvement on mpg. So more saving in fuel cost.

If it sits at quauter way this means your thermostat opens at a lower rating .
S-series spec for thermostat cap pressue 190 13-20 psi
You need to get the one at advance auto
Cooling Capacity, Qts. 7
Radiator Cap Relief Pressure, Lbs. 13-20
Thermo. Opening Temp. Deg. F 190

Run what your engine specs say 190 opening temp for thermostat

If you run lower that the engine design. It will run rich cause more carbon inside your engine and it will be hard on your catalytic convertor . It makes the cat do more work .


The thermal element in the STANT 14279 and the spring compression together set the initial opening point at 87C(188.6F) and this is the point of minimum fluid flow. At about 195F(90.5C) the flow has reached maximum and the bypass valve, on the other end of the thermostat, has just closed. At 212F(100C) the thermostat element has reached maximum extension.

These conditions meet the published OEM design specifications for the Saturn thermostat.

Last edited by Packard; 10-18-2018 at 07:10 AM..

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Old 10-18-2018, 11:01 AM   #9
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2006 VUE 3.5L
Default Re: Poor heat from the floor vents

I had the same. Look at the side of the air box to the right of the drivers feet and you will see the sheath for the temperature selector. As you move the selector left and right the cables moves in the sheath. If that sheath breaks away from its flimsy plastic mount it will move in and out greatly reducing the travel of the temperature selector. I drilled a hole on the airbox mount and zip tied mine back on and now after skiing jn Tahoe I have heat.

-Robert

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Old 10-30-2018, 09:32 PM   #10
Keblar
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2002 SL2
Default Re: Poor heat from the floor vents

Are the S-Series vents Vacuum actuated or mechanical? I feel like the flow on various settings isn't as sharp on mine as has been in early years, like vent doors aren't totally sealing. Occasionally there's a range in the dial where I can hear the doors sort of flapping/cycling in 1 or 2 second intervals. I was thinking it was just the dial managing to be in between settings, but could also be debris, or poor actuation.

Could be similar to your issues. I just sort of put up with it, but this will also be the 1st winter since I solved my manifold coolant leak, so if it's still a problem maybe I'll try to sort it out.

...
2002 SL2 ~300k Miles

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