No Heat In 89 Prelude Si?
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Honda-Tech Member
Joined: Jan 2003
Posts: 6,565
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From: Herkimer, NY, USA
No Heat In 89 Prelude Si?
Hey everyone... For the past few days it's been below zero up here in NY, and I've had VERY little heat in the car... The temp gauge doesn't move, even though I drive about 30 minutes to work and let the car warm up for about 5 minutes in the morning...
However, when the air temp is higher, the temp gauge will move up to about normal, and I'll have heat in the car... But when it's really cold, it only gets up to about 40 degrees in the car...
My radiator is full, and I really don't know what else to check... It really sucks to have to wear a hat and earmuffs and thick gloves all the way to work....
Any suggestions?
However, when the air temp is higher, the temp gauge will move up to about normal, and I'll have heat in the car... But when it's really cold, it only gets up to about 40 degrees in the car...
My radiator is full, and I really don't know what else to check... It really sucks to have to wear a hat and earmuffs and thick gloves all the way to work....
Any suggestions?
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Joined: Nov 2003
Posts: 5,986
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From: Kitchener, Ontario, CANADA
Re: (B18C_EJ8)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 »</TD></TR><TR><TD CLASS="quote">Stuck open would prevent hot coolant from entering the heater core??? </TD></TR></TABLE>
stuck open would prevent your engine from heating up as fast. Wouldn't be a bad idea to replace a t-stat, it's cheap and pretty easy to do and even if it doesn't fix your problem you can rule out the t-stat as a possible cause.
stuck open would prevent your engine from heating up as fast. Wouldn't be a bad idea to replace a t-stat, it's cheap and pretty easy to do and even if it doesn't fix your problem you can rule out the t-stat as a possible cause.
Joined: Apr 2003
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From: Fort Mill, SC, USA
Re: (2point2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 »</TD></TR><TR><TD CLASS="quote">
Wouldn't be a bad idea to replace a t-stat, it's cheap and pretty easy to do and even if it doesn't fix your problem you can rule out the t-stat as a possible cause.
</TD></TR></TABLE>
I remember when my first lude ran hot, hoebag thought the car was totaled and i got it for 1800 bucks
ended up being like a 7 dollar t-stat try that first
Wouldn't be a bad idea to replace a t-stat, it's cheap and pretty easy to do and even if it doesn't fix your problem you can rule out the t-stat as a possible cause.
</TD></TR></TABLE>
I remember when my first lude ran hot, hoebag thought the car was totaled and i got it for 1800 bucks
ended up being like a 7 dollar t-stat try that first
Thread Starter
Honda-Tech Member
Joined: Jan 2003
Posts: 6,565
Likes: 1
From: Herkimer, NY, USA
Well, tonight it was about 15 degrees, and it was about 50-60 degrees inside the car... Definitely a direct correlation between outside air temperature and how warm it gets inside...
Anyone got a how-to on changing the t-stat?
Anyone got a how-to on changing the t-stat?
Re: (B18C_EJ8)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C_EJ8 »</TD></TR><TR><TD CLASS="quote">Stuck open would prevent hot coolant from entering the heater core??? </TD></TR></TABLE>
Well, the way the cooling system works is the thermostat is closed when the car is cold. After the car is started...the coolant in the engine block is not flowing, allowing the coolant to warm up. As the coolant gets to operating temperature...the heat of the coolant will cause the thermostat to open up a little. As the car gets even hotter, the thermostat opens even more so that the hot coolant can flow through the radiator (in the front of the car for a reason. It uses the cooler air outside to assist in cooling down the coolant).
If your thermostat was stuck closed your car would eventually overheat, even if the temperature outside is very cold. The hot coolant will stay around the engine block, continuing to get hotter and hotter.
I am willing to bet anything that your thermostat is stuck open. The coolant is constantly flowing throughout your entire cooling system, never getting the opportunity to warm up because the outside temp is cooling it when the coolant passes through the radiator.
Let us know what you find.
EDIT: Oh yeah, when you drive your car around like this it is bad for it. You get bad gas mileage and poor lubrication. I would change it ASAP.
Well, the way the cooling system works is the thermostat is closed when the car is cold. After the car is started...the coolant in the engine block is not flowing, allowing the coolant to warm up. As the coolant gets to operating temperature...the heat of the coolant will cause the thermostat to open up a little. As the car gets even hotter, the thermostat opens even more so that the hot coolant can flow through the radiator (in the front of the car for a reason. It uses the cooler air outside to assist in cooling down the coolant).
If your thermostat was stuck closed your car would eventually overheat, even if the temperature outside is very cold. The hot coolant will stay around the engine block, continuing to get hotter and hotter.
I am willing to bet anything that your thermostat is stuck open. The coolant is constantly flowing throughout your entire cooling system, never getting the opportunity to warm up because the outside temp is cooling it when the coolant passes through the radiator.
Let us know what you find.
EDIT: Oh yeah, when you drive your car around like this it is bad for it. You get bad gas mileage and poor lubrication. I would change it ASAP.
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