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Gauge cluster acting funny
#721836 March 28th 2017 8:13 pm
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On my new to me g20 van, the temp gauge always reads cold. I replaced the coolant temp sensor near the thermostat. Is there a second sensor on the driver's side cylinder head?

Now I noticed the oil pressure reading low on coasting or acceleration but stabilizes in the middle at a steady speed. The engine feels perfectly OK


Re: Gauge cluster acting funny
Offgrid2 #721837 March 28th 2017 8:28 pm
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There is another temp sensor.... its on the pass side. 1 for the coolant going into the block & 1 on the way out, comp reads them both. 2 different sensors 1 with a little brass butt & the other has a big brass butt.


Your oil gauge .... change your oil & filter. The oil is either sluggie or the oil filter is clogged.

Re: Gauge cluster acting funny
Offgrid2 #721870 March 29th 2017 5:15 pm
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Thanks, do you have a part no. for that sensor?

Also regarding the oil, I checked the dipstick, there was the initial residue, I cleaned it and inserted it in, pulled it out, and there is no oil registering.

I did an oil change 2000 miles ago, there are no oil leaks. No idea where the oil went.

Re: Gauge cluster acting funny
Offgrid2 #721877 March 29th 2017 7:19 pm
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I just went through this on my 90. The temp SENSOR is by the thermostat, it will affect your idle. The temp SENDER is the other one and is for your gauge. I had a fast and hunting idle and the sensor cured it.

Re: Gauge cluster acting funny
Offgrid2 #721882 March 29th 2017 9:49 pm
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Ahh I see, thank you.

I managed to fill 2.5 quarts of oil to get back to the top of the hash marks. Correction to earlier, I did the oil change about 4000 miles ago, but it should not be burning oil. I watched the exhaust as I drove and I could not see any smoke.

Re: Gauge cluster acting funny
Offgrid2 #721885 March 29th 2017 10:12 pm
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My 454's dont smoke either but I go thru 1 qt in a 1000 miles.

Low oil creates heat & the oil gets thinner & blows by the rings.

Might want to check your radiator fluid level.

The lower the oil the more heat, the more heat the faster the coolant evaps.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Gauge cluster acting funny
Offgrid2 #721886 March 29th 2017 10:22 pm
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Well everyone I top the coolant to the fill line on the expansion tank, not long after driving it the coolant will go down and rest at the top of the radiator and stays like that. I do not see any coolant leaks.

Re: Gauge cluster acting funny
Offgrid2 #721904 March 30th 2017 2:03 pm
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Well being 2 1/2 qts low the extra heat evaporated it.

The only other thing I can think of is your heater core is leaking..


After you topped off the oil & coolant does it still want more coolant ? If so, with no other signof a leak I would say its your heater core.

Check the carpet under the dash on the passenger side. Is it wet or sticky ?

https://www.vanning.com/threads/ubbthreads.php/topics/721220/1


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Gauge cluster acting funny
Offgrid2 #721952 March 31st 2017 11:44 pm
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The area below the heater core is dry. When I fill the coolant to the fill line on the expansion tank and drive around for a bit, the coolant drops to the top of the radiator.

The only place I have noticed a small amount of coolant was on the intake manifold.

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