1995 Ls Thermo won't open
#1
1995 Ls Thermo won't open
Sup guys, I have a 95 obd1 b18b I took out of my integra and put into 92 bubble. I have a problem with the thermostat not opening and my car over heating. I have an after market temp gage installed so I know exactly what temp I'm at. Right now I'm running without the Thermo just so I can get around. I've looked all over the forums for my specific issue and i haven't found anything. Here's the issue:
When I did the swap right when I turned the car on a let it run after filling the engine with coolant I noticed the thermostat wasn't opening. Made sure to bleed all air out of system. Even filled bottom hose let it run, but the thermostat never opened. The car was running at 220 F before I turned it off. I went bought a new Thermo installed it correctly. Filled rad, bled air, let it run. Still wasn't opening. The bottom hose still cold and top hose so hot. Bottom of rad is ice top is hot. Heard about faulty thermos went and bought another. Same thing happened. So I thought maybe there's a clog in my rad or air so I swapped my half rad I have and hooked up the integra rad. Same deal bottom cold top hot. Thermo not opening.
So here's the thing. I'm thinking my water pump could be weak. Because the water pump is working and taking in fluid but maybe it's not creating enough pressure to help open Thermo? I mean the water is hot!!! So it's not a temp problem at the Thermo! Any help much appreciated.
first post btw! Sup guys
When I did the swap right when I turned the car on a let it run after filling the engine with coolant I noticed the thermostat wasn't opening. Made sure to bleed all air out of system. Even filled bottom hose let it run, but the thermostat never opened. The car was running at 220 F before I turned it off. I went bought a new Thermo installed it correctly. Filled rad, bled air, let it run. Still wasn't opening. The bottom hose still cold and top hose so hot. Bottom of rad is ice top is hot. Heard about faulty thermos went and bought another. Same thing happened. So I thought maybe there's a clog in my rad or air so I swapped my half rad I have and hooked up the integra rad. Same deal bottom cold top hot. Thermo not opening.
So here's the thing. I'm thinking my water pump could be weak. Because the water pump is working and taking in fluid but maybe it's not creating enough pressure to help open Thermo? I mean the water is hot!!! So it's not a temp problem at the Thermo! Any help much appreciated.
first post btw! Sup guys
#2
Old Fart
Join Date: May 2004
Location: kelowna, bc, canada
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Re: 1995 Ls Thermo won't open
The water pump has nothing to do with when/if the thermostat opens, engine coolant does, and if your hitting 220F it should be opening unless the thermostat is a 220F or higher.
Have you tested the thermostat in a pot of boiling water?
Is the thermostat installed upside down, don't know if it's possible on your engine?
The above does not mean your water pump is good, how many miles on it?94
Have you tested the thermostat in a pot of boiling water?
Is the thermostat installed upside down, don't know if it's possible on your engine?
The above does not mean your water pump is good, how many miles on it?94
#6
Re: 1995 Ls Thermo won't open
It's on the side of the head under the distributor it has one wire going to it. And okay I'll try to check housing temp. The temp gage was in the car before my motor was. So would it read the wrong temp because it's working off the stock sensor?
#7
Old Fart
Join Date: May 2004
Location: kelowna, bc, canada
Posts: 26,173
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Re: 1995 Ls Thermo won't open
What is the make and model of the temp. sensor, a lot of aftermarket gauges will need their own sensor.
I have that problem on a 73 GMC P/U I am wiring for a customer, it is an AutoMeter, can't remember the model, but had to order the sensor for it. 94
I have that problem on a 73 GMC P/U I am wiring for a customer, it is an AutoMeter, can't remember the model, but had to order the sensor for it. 94
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#8
Honda-Tech Member
Re: 1995 Ls Thermo won't open
Are the fans coming on? Sounds like air in the system, try sqeazing the bottom hose to get the fluid pumping more.
Did you put the heater on full blast when bleeding the air out the radiator? I usually put the heat on high and let it idle with the cap off the radiator till all the bubbles are gone and fans turn on and hoses are hot.
Did you put the heater on full blast when bleeding the air out the radiator? I usually put the heat on high and let it idle with the cap off the radiator till all the bubbles are gone and fans turn on and hoses are hot.
#9
Re: 1995 Ls Thermo won't open
Sup guys, I have a 95 obd1 b18b I took out of my integra and put into 92 bubble. I have a problem with the thermostat not opening and my car over heating. I have an after market temp gage installed so I know exactly what temp I'm at. Right now I'm running without the Thermo just so I can get around. I've looked all over the forums for my specific issue and i haven't found anything. Here's the issue:
When I did the swap right when I turned the car on a let it run after filling the engine with coolant I noticed the thermostat wasn't opening. Made sure to bleed all air out of system. Even filled bottom hose let it run, but the thermostat never opened. The car was running at 220 F before I turned it off. I went bought a new Thermo installed it correctly. Filled rad, bled air, let it run. Still wasn't opening. The bottom hose still cold and top hose so hot. Bottom of rad is ice top is hot. Heard about faulty thermos went and bought another. Same thing happened. So I thought maybe there's a clog in my rad or air so I swapped my half rad I have and hooked up the integra rad. Same deal bottom cold top hot. Thermo not opening.
So here's the thing. I'm thinking my water pump could be weak. Because the water pump is working and taking in fluid but maybe it's not creating enough pressure to help open Thermo? I mean the water is hot!!! So it's not a temp problem at the Thermo! Any help much appreciated.
first post btw! Sup guys
When I did the swap right when I turned the car on a let it run after filling the engine with coolant I noticed the thermostat wasn't opening. Made sure to bleed all air out of system. Even filled bottom hose let it run, but the thermostat never opened. The car was running at 220 F before I turned it off. I went bought a new Thermo installed it correctly. Filled rad, bled air, let it run. Still wasn't opening. The bottom hose still cold and top hose so hot. Bottom of rad is ice top is hot. Heard about faulty thermos went and bought another. Same thing happened. So I thought maybe there's a clog in my rad or air so I swapped my half rad I have and hooked up the integra rad. Same deal bottom cold top hot. Thermo not opening.
So here's the thing. I'm thinking my water pump could be weak. Because the water pump is working and taking in fluid but maybe it's not creating enough pressure to help open Thermo? I mean the water is hot!!! So it's not a temp problem at the Thermo! Any help much appreciated.
first post btw! Sup guys
#10
Re: 1995 Ls Thermo won't open
It's possible that the thermostat you've installed is opening at too high of a temperature or not opening enough, and this is causing the car to overheat by restricting water flow.
I would heat it up in a pot of water and check the temperature with a meat thermometer. The OEM specs are that it should be fully open (>= 8mm) at 194 F I think.
I would heat it up in a pot of water and check the temperature with a meat thermometer. The OEM specs are that it should be fully open (>= 8mm) at 194 F I think.
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