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#587409 - 11/21/04 12:51 PM Slow Temp Gauge?
specops1526 Offline
Member

Registered: 04/08/04
Posts: 252
Loc: Los Angeles, CA
Hi,

I just noticed this morning that my temp gauge took forever to show full operating temperature (halfway up gauge). I drove about 15 miles on the highway before it came up. The car is running great so not sure if there is a problem or if it's that these gauges really don't show true readings. Any ideas or is this just normal?

I use Mobil 1, can this have any affect on engine temps? It's a little low so I need to go and buy a quart. The car has 103K.

Thanks!
_________________________

2000 CVPI - Sold
1997 Land Rover Defender 90
2004 Land Rover Discovery SE
2004 Land Rover Discovery G4

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#587410 - 11/21/04 02:36 PM Re: Slow Temp Gauge?
1BADMERC Offline
Over the Hill

Registered: 08/31/04
Posts: 3645
Loc: one foot in the grave
Maybe check the gauge with a multimeter? the resistance should go down as the engine temp goes up, at least on my year. Yours could be different, so maybe check the manual. Then, I would inspect the weep hole on the water pump, make sure the pump is running smoothly and quietly, and also make sure you have the right H2o/coolant mix. Check coolant level in reservoir, check hoses for leaks, splits, loose clamps, etc. When was the cooling system last flushed?
Not sure about the Mobil 1, I don't use the stuff, although if my car had half the mileage it has now I would try the switch.
_________________________
1993 GM LS
243k miles
29.5mm PI front bar(ENS greaseable poly bushings),21mm HPP rear bar(ENS poly bushings/endlinks),Mechanical Stewart-Warner oil pressure gauge. Black steelies/center caps...K&N filter

1994 Lincoln Mark VIII
144k miles
All airbags switched to coils/struts, junk tranny, motor donor car
Mercury Owners Group

This is a disclaimer:
This post is the opinion of the person in question. It is presented as nothing more than that. Furthurmore, this opinion is is not necessarily the opinion of CVN, any of its affiliates, or anyone else on Earth.

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#587411 - 11/21/04 02:58 PM Re: Slow Temp Gauge?
darkdan Offline
Over the Hill

Registered: 04/19/03
Posts: 3156
Loc: Owatonna, MN
Thermostat might be stuck open. It's rare, but it happens.

Check the coolant level too.

I doubt any oil could be good enough to keep an engine from warming up for 15 miles.
_________________________
I'm Dark, I'm Dan....I'm Darkdan.

98 CVPI With A Black Grill!
Southern MN's Cheapest (and 2nd worst) window tinter!
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#587412 - 11/21/04 03:01 PM Re: Slow Temp Gauge?
specops1526 Offline
Member

Registered: 04/08/04
Posts: 252
Loc: Los Angeles, CA
Does Checking the gauge require removing the dash? There doesn't seem to be any unusual noises coming from the engine, I do here a clicking occasionally though, not loud though. I had the coolant flushed and filled back in april so that should be ok. I'll look around the enigine bay some more. I've never noticed any puddles under the car either.

thanks!
_________________________

2000 CVPI - Sold
1997 Land Rover Defender 90
2004 Land Rover Discovery SE
2004 Land Rover Discovery G4

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#587413 - 11/21/04 03:03 PM Re: Slow Temp Gauge?
specops1526 Offline
Member

Registered: 04/08/04
Posts: 252
Loc: Los Angeles, CA
hey dan,

how do I check if the T-stat is open?

thanks!
_________________________

2000 CVPI - Sold
1997 Land Rover Defender 90
2004 Land Rover Discovery SE
2004 Land Rover Discovery G4

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#587414 - 11/21/04 03:14 PM Re: Slow Temp Gauge?
1BADMERC Offline
Over the Hill

Registered: 08/31/04
Posts: 3645
Loc: one foot in the grave
T-stat might be it. Checking the temp.sensor would make more sense (than checking the gauge itself), it is threaded into the intake manifold, remove the electrical connector and check the resistance.
As far as the thermo, I'll let DD field that one.
All I know is:
Thermostat keeps coolant IN block until motor reaches certain temp. Then thermo opens pumping hot coolant through radiator. If it takes a long time to warm up, it would make sense that it would be stuck OPEN, with coolant being pumped through the radiator right from startup instead of staying in the block and warming up.
_________________________
1993 GM LS
243k miles
29.5mm PI front bar(ENS greaseable poly bushings),21mm HPP rear bar(ENS poly bushings/endlinks),Mechanical Stewart-Warner oil pressure gauge. Black steelies/center caps...K&N filter

1994 Lincoln Mark VIII
144k miles
All airbags switched to coils/struts, junk tranny, motor donor car
Mercury Owners Group

This is a disclaimer:
This post is the opinion of the person in question. It is presented as nothing more than that. Furthurmore, this opinion is is not necessarily the opinion of CVN, any of its affiliates, or anyone else on Earth.

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#587415 - 11/21/04 03:19 PM Re: Slow Temp Gauge?
BastonRob Offline
Climber

Registered: 02/17/04
Posts: 725
I have a '99 CV and a '99 GMarq.

The GMarq guage takes a long time to start to move and takes about twice the running distance for the guage to show the normal operating reading.

Both cars start to throw heat about the same time. I think the GMarq guage is just less responsive.

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#587416 - 11/21/04 04:08 PM Re: Slow Temp Gauge?
darkdan Offline
Over the Hill

Registered: 04/19/03
Posts: 3156
Loc: Owatonna, MN
Checking the TStat involves removing it.

If you're removing it, you may as well just replace it.

Another thing you can do is start the engine and let it idle and keep checking (touching) the upper radiator hose. If it's hot, but the temp gauge says cold then the gauge just isn't working correctly.

Usually TStats break and get stuck closed. Thus causing overheating. On my aspire it did get stuck open though. Took forever last winter to warm up and even if you were speeding down the highway if you turned on the heat you could watch the engine cool down. LOL. Even with a properly working TStat now it still does it, but not nearly as bad.
_________________________
I'm Dark, I'm Dan....I'm Darkdan.

98 CVPI With A Black Grill!
Southern MN's Cheapest (and 2nd worst) window tinter!
3M Paint Protection Film!

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#587417 - 11/21/04 05:03 PM Re: Slow Temp Gauge?
specops1526 Offline
Member

Registered: 04/08/04
Posts: 252
Loc: Los Angeles, CA
Well, I checked the coolant level and it was just a bit low, so I topped it off. However on the way to the store to buy some more coolant the temp gauge reached it's normal level with about 3 miles from my house. I think I'll still check the T-stat or have it replaced. What's the cost of this repair ususally run?

Thanks!
_________________________

2000 CVPI - Sold
1997 Land Rover Defender 90
2004 Land Rover Discovery SE
2004 Land Rover Discovery G4

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#587418 - 11/21/04 05:06 PM Re: Slow Temp Gauge?
SteveS Offline

Administrator
Posting Addict

Registered: 05/16/01
Posts: 15881
Loc: Groveland, MA
If you have a 2000 with the factory thermostat, change it.
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Steve
**Boston SmartTraveler road unit 473**


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#587419 - 11/21/04 05:18 PM Re: Slow Temp Gauge?
mybluegm Offline
Over the Hill

Registered: 02/26/03
Posts: 1111
Loc: NYC
So true, mine went early on (stuck open).

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#587420 - 11/21/04 05:46 PM Re: Slow Temp Gauge?
darkdan Offline
Over the Hill

Registered: 04/19/03
Posts: 3156
Loc: Owatonna, MN
Changing a TStat takes about 30 minutes for someone who's drinking while working on the car. It's like 2 bolts.

The low on coolant may have just made it so the temp sensor wasn't actually in the coolant.
_________________________
I'm Dark, I'm Dan....I'm Darkdan.

98 CVPI With A Black Grill!
Southern MN's Cheapest (and 2nd worst) window tinter!
3M Paint Protection Film!

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#587421 - 11/22/04 12:18 AM Re: Slow Temp Gauge?
Steve83 Offline
Poobah

Registered: 10/03/04
Posts: 7445
Loc: Memphis, TN 38002, USA, Earth,...
Instead of pulling the terminal off the sender & hooking up a meter, or changing the t-stat, just TURN ON THE HEATER. If it blows warm air, the gauge should show warm. If it blows cold air & the gauge shows cold...
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#587422 - 11/22/04 12:48 AM Re: Slow Temp Gauge?
hows-ur-momma Offline
Climber

Registered: 07/06/03
Posts: 963
Loc: Van Vleck, Tx.
mine does something slightly different...

ever since I installed the steeda underdrives my temp guage went down more and more.
It used to come up between the N and O on the guage, but now it doesnt even get over the first bar at the bottom of the guage if I drive for 40 miles, unless I go WOT over 70 3 or 4 times on a hot day passing people.

guess its either the guage or sensor because I have worked under the hood since and that radiator hose gets hot!! Guess i'll check it out tomorrow.

Still cant get that damn anti lock light to go out either...read the codes and it said controller. Replaced that and its still on! Guess I'll have to check the sensors next...
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#587423 - 11/23/04 02:24 AM Re: Slow Temp Gauge?
specops1526 Offline
Member

Registered: 04/08/04
Posts: 252
Loc: Los Angeles, CA
So I've been keeping an eye on it and here are my observations. After leaving the car sitting for a long period of time with the weather in the uppper 40's to low 50's, I noticed that it takes about 3-4 miles on surface roads for the temp gauge to show normal operating temp.

The last time I drove it, which was tonight (probably low 40's out), I turned the heat on after start up and noticed that the gauge stayed very near the C, which makes sense since it was preventing the engine from overheating. I kept the heat on for about a mile to a mile and a half and it remained in the cold area eventhough the air was getting quite hot. With the heat off now, after about 3-4 miles and about 10-12 minutes or so, the gauge reached it's normal operating temp (the needle is just on top of the second ripple line of the thermometer pic, almost halfway up the gauge). I felt the upper radiator hose and it was hot.

So, is there something wrong or is this just normal operation?

Thanks for all your input!
_________________________

2000 CVPI - Sold
1997 Land Rover Defender 90
2004 Land Rover Discovery SE
2004 Land Rover Discovery G4

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