Overheating after new thermostat

Overheating after new thermostat

Postby Mberry0614 [OP] » December 30th 2019, 5:04am

My van was running cold, so I installed new thermostat. It ran great for about a week, then a of a sudden it started overheating. I figured it was bad thermostat. But when I tore it all apart again, there was no coolant in the water outlet. So it must have overheated because of low coolant. So I replaced thermostat anyway. I don't remember seeing a gasket on the bottom of the water outlet. Does it need one? Could coolant have been leaking from there? I did have a small pinhole size leak in the radiator, but I rarely had to add water to it, except in the summer during excessive heat, it leaked quite a bit. Could my new thermostat caused it to start leaking excessively again? Or was it the lack of water outlet gasket? Thanks for your input
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Re: Overheating after new thermostat

Postby AstroWill » December 30th 2019, 7:35am

1. Fix ALL of your leaks. Yes there is a gasket for the water outlet.
2. Properly fill with coolant and remove the air from the system.
3. Profit.

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Re: Overheating after new thermostat

Postby Mberry0614 [OP] » December 30th 2019, 6:57pm

So I put some gasket maker on the water outlet and it seemed to seal just fine. But I took it for a test drive and about 5 miles later it started overheating, I opened the hood and the coolant level was still ok, but something is leaking behind the alternator and there is a hissing sound. Could that be the water pump leaking or maybe that coolant hose? I can't tell without taking everything apart.
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Re: Overheating after new thermostat

Postby Leeann_93 » December 31st 2019, 12:38am

Leaking behind the alternator? That's either a heater hose or the LIM gasket. You're going to have to pull stuff so you can see.

Water pump is, literally, front and center (top and bottom and left and right) on the engine. So that's not the noise or the leak that you can see.

The only seal for the water outlet is the o-ring gasket around the thermostat. No other seal is required.
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Re: Overheating after new thermostat

Postby Mberry0614 [OP] » June 3rd 2020, 3:32pm

Ended up being the Intake Gasket leaking. I had that fixed, Along with new radiator and heater control valve.
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Re: Overheating after new thermostat

Postby Mmusicman » June 3rd 2020, 3:53pm

Mberry0614 wrote:there was no coolant in the water outlet. So it must have overheated because of low coolant..

Funny how that works. :o
Glad you seemingly got it all resolved.
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Re: Overheating after new thermostat

Postby Mberry0614 [OP] » June 3rd 2020, 4:10pm

New issue:
Temp. gauge has not worked since I got the van back from the guy who fixed the intake Gasket. Lately, it has sometimes been hard to start; I assumed it was fuel filter. Yesterday, the van just up & died while driving. Started right back up, but noticed low battery voltage & check engine light, with Code PO118, coolant temp. sensor. All connections look fine, but when I got underneath the van, I noticed a small coolant leak, could possibly be coming from lower radiator hose not being attached correctly when radiator was replaced. Coolant level was low, and also looked a little rusty. And I happened to notice the gauge shot up when one of my buddies was squeezing one of the radiator hoses. Any suggestions? I assume I need to start with coolant temp sensor, but I feel like there might be more to it then that......
Thanks
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Re: Overheating after new thermostat

Postby Rod's Trucks » June 3rd 2020, 5:06pm

If the coolant temp shot up when squeezing the lower hose, I think that means you were probably a bit low on water, an squeezing the hose made hot water reach the temp sensor. It sounds like the temp sensor is working just fine,
You mentioned another leak! You have to get leaks under control!
The Local FLAPS probably has a radiator cap and cooling system pressure tester. to rent out. Borrow it and do a system pressure test. You will then find your all leaks. Then you can have some assurance the cooling system will hold the stuff you put in it.
Good luck, we will help you figure it out.
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Re: Overheating after new thermostat

Postby Mmusicman » June 3rd 2020, 5:14pm

Sounds like you have a host of problems and need a better mechanic
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