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Head gaskets, thermostat? #5281742 12/01/19 08:45 AM
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otis24 Offline OP
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1991 Chevrolet K1500, 4.3 engine. Engine temperature shoots up pretty quickly upon starting. Would think that if it was the thermostat, it would take a bit for the temperature to come up. Your thoughts?


1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: Head gaskets, thermostat? [Re: otis24] #5281746 12/01/19 08:49 AM
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Astro14 Offline
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Are you certain that the dash gauge is accurate?


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Re: Head gaskets, thermostat? [Re: otis24] #5281760 12/01/19 09:02 AM
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Silverado12 Offline
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Although I have heard of 4.3 head gasket leaks, it's not a common problem. If there's air in the system the temp will rise quickly. If the block is busted from freezing maybe too.


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Re: Head gaskets, thermostat? [Re: otis24] #5281762 12/01/19 09:06 AM
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mk378 Offline
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Are you saying that this fast warm-up is followed by overheating?

Any thermostat should be fully closed during warm-up, so it wouldn't matter. Slow or no warm-up would mean thermostat is stuck open.

Very easy to remove thermostat on these to test or just replace.

Re: Head gaskets, thermostat? [Re: otis24] #5281809 12/01/19 09:47 AM
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otis24 Offline OP
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When the key is off and the vehicle has sat for a while, the temp is staying up. Makes me think it is a guage or coolant temp sensor issue. Er, I should say that the guage reading is staying up.

Last edited by otis24; 12/01/19 09:48 AM.

1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: Head gaskets, thermostat? [Re: otis24] #5281825 12/01/19 09:59 AM
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Warstud Offline
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oh

Last edited by Warstud; 12/01/19 10:01 AM.
Re: Head gaskets, thermostat? [Re: otis24] #5281851 12/01/19 10:32 AM
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mk378 Offline
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Have you checked that the radiator is full? Any operational problems such as boiling over or heater not working?

Re: Head gaskets, thermostat? [Re: otis24] #5281868 12/01/19 10:49 AM
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zzyzzx Offline
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Originally Posted by otis24
1991 Chevrolet K1500, 4.3 engine. Engine temperature shoots up pretty quickly upon starting. Would think that if it was the thermostat, it would take a bit for the temperature to come up. Your thoughts?


If it were a newer vehicle, I would connect a code reader that does live data, compare that to the dash gauge that you are presumably looking at.

Re: Head gaskets, thermostat? [Re: otis24] #5281871 12/01/19 10:51 AM
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otis24 Offline OP
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Radiator is full. No apparent sign of overheating. Didn't run it long enough today to get the temperature up to check the heater.


1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: Head gaskets, thermostat? [Re: otis24] #5281920 12/01/19 11:50 AM
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Probably a bad Coolant Temp Sensor. There's probably two....so make sure your replacing the one that connects to the dash gauge. There not expensive but you can test it before replacing it. Check YouTube for testing. I'd start spraying it down with penetrating oil now.

Re: Head gaskets, thermostat? [Re: otis24] #5281978 12/01/19 12:35 PM
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Typically the sender you want as a single , one for FI is 2 wire. grin2


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Re: Head gaskets, thermostat? [Re: otis24] #5281982 12/01/19 12:39 PM
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It would take about 15 minutes from a cold start to get hot. If it's going up faster than that it's likely the gauge or sender. Check the actual temp with an IR gun.


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