Car is UNDER heating....please read Trainrex and others
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This is a discussion on Car is UNDER heating....please read Trainrex and others within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Ok well it's 2 am here and I'm going to describe my little problem. I'm going to call to my ...

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    Car is UNDER heating....please read Trainrex and others

    Ok well it's 2 am here and I'm going to describe my little problem. I'm going to call to my shop tomorrow and see what they say but if I can get a little heads up that would be nice. Situation:

    The weather has been cold here the last few nights. Tonight the Temp was around 20ish. I've noticed recently that it has taking my car a pretty long time to get up to temputre while driving. So tonight I start watching my needle on the coolant gauge and it's going no where near where it used to. And sometimes it's going all the way down to the first bar. I am guessing that my thermostat is sticking? Does this sound right? I dont think it's a faulty sensor cause I can feel the heat in the car get less and less as the gauge is dropping. It's a 95 escort......thanks in advance.
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    Registered User cyrilgrey's Avatar
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    it's your thermostat, i would replace it or try to repair it.

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    Administrator Trainrex's Avatar
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    I would definataly lean towards the thermostat.

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    Thanks for confirming. Is this something I should fix today before I go to work or can I fix it tomorrow? I dont mind being a little chilled on my drive as long as it's not going to hurt my car.
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    Administrator Trainrex's Avatar
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    Quote Originally Posted by 302@12psi
    Thanks for confirming. Is this something I should fix today before I go to work or can I fix it tomorrow? I dont mind being a little chilled on my drive as long as it's not going to hurt my car.
    I wouldn't worry about it. If it isn't exhibiting signs of overheating, another day isn't going to hurt.

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    Buzzz Wannabe's Avatar
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    Na, no problem there. It is not going to hurt the car. But a few things you do need to keep in mind about performance etc. Most car computers in this era require a certain temp to run properly. Most will run the car rich until that point. That means your car could be getting less performance and worse mileage than if it reached that minimum temperature. So a change would not hurt it at all. And a new thermostat is cheap and easy to fix. Just do it when you have a little time.

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    Ok well I just got done putting it in at my other job. And on the way home it was doing the same thing. As long as your moving it starts to get up to temp. but the second you hit a red light the temp drops and the heat gets cold. No idea to what is it. I'm going to drop it off later this week...Any ideas
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    Administrator Trainrex's Avatar
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    Some questions. Is your fan stuck on? Is the valve on the heater hose operating? Have you burped the system? Could it have an air bubble?

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    Those are all good questions. I doubt my fan is stuck on unless it isnt shutting off. I know when I start the car it doesnt come on right away and if I run it and let it sit it's not staying on...so i say no.

    I havent "burped" the system but I did have the system open when i took the themostat off today and replaced...i just filled it back with an eye ball mix of 50/50 (water to antifreeze).

    I'm just hoping it's something dumb and nothing expensive. It's odd as heck casue the car never really reaches temputer and when I hit a red light it'll go way down. It's sucks having cold 9 degree air being tossed into your cabin after work........oh well I might take the gf's car until thursday when the mechanics at work can look at it.

    It has a new raditor and water pump.....so i'm not sure......grr......hoping it isnt a head gasket
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    Administrator Trainrex's Avatar
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    Quote Originally Posted by 302@12psi
    Those are all good questions. I doubt my fan is stuck on unless it isnt shutting off. I know when I start the car it doesnt come on right away and if I run it and let it sit it's not staying on...so i say no.

    I havent "burped" the system but I did have the system open when i took the themostat off today and replaced...i just filled it back with an eye ball mix of 50/50 (water to antifreeze).

    I'm just hoping it's something dumb and nothing expensive. It's odd as heck casue the car never really reaches temputer and when I hit a red light it'll go way down. It's sucks having cold 9 degree air being tossed into your cabin after work........oh well I might take the gf's car until thursday when the mechanics at work can look at it.

    It has a new raditor and water pump.....so i'm not sure......grr......hoping it isnt a head gasket
    Normally a bad headgasket would exhibit a different set of problems. I also have to ask, no offense, could the thermostat be in backwards? I've seen that before.

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    No the themo. is in correctly and it is seated. I made sure of that. I'm taking it this morning to another local shop (the wonderful ness of supplying parts to these people is you get to know them all) and i'm going to let him look at it. Hopefuly I wont have to go without it for a long period of time. Thanks for the help through.
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    Let us know how it goes... I'm curious.
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    Whack the thermostat housing smartly with a soft mallet. Might unstick it. Or just swap the thing for another and be done with it - that's the formal, correct thing to do.
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    Well i can safely say that I probaly wasted 40 mins replacing the thermostat in the car the other day. I took it to a local shop that we deal with and he looked it. He drove it and some how came up with a clogged heater core. So he took it out and he said there was some ice and other debris in it. I guess when my shop put the radiator in they may have put to much water in it and the extream temps made it freeze. I know they probaly did 50/50 mix but maybe the Antiefreeze wasnt up to par...who knows


    So he took the heatercore out and flushed it for me. Now the heat comes out hot and it runs up to temp. I guess the heater core was preventing the coolant from flowing and just backing up in the motor.

    He only charged me like 40 bucks but I'll probaly give him 60 as I like to take care of people who take car of me. Just letting everyone know what is was...as dumb as it may sound.
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    Quote Originally Posted by 302@12psi
    Well i can safely say that I probaly wasted 40 mins replacing the thermostat in the car the other day. I took it to a local shop that we deal with and he looked it. He drove it and some how came up with a clogged heater core. So he took it out and he said there was some ice and other debris in it. I guess when my shop put the radiator in they may have put to much water in it and the extream temps made it freeze. I know they probaly did 50/50 mix but maybe the Antiefreeze wasnt up to par...who knows


    So he took the heatercore out and flushed it for me. Now the heat comes out hot and it runs up to temp. I guess the heater core was preventing the coolant from flowing and just backing up in the motor.

    He only charged me like 40 bucks but I'll probaly give him 60 as I like to take care of people who take car of me. Just letting everyone know what is was...as dumb as it may sound.
    A few things. I think he may have given you a "story" about what was wrong. A: R&Ring a heater core is a major job. They really suck. It normally costs a customer hours and hours of labor to R&R. B: No one bothers trying to flush one and chancing it still being clogged. It's to much work to remove it and not replace it. C: Vehicles are designed to cool properly with the heater core TOTALLY blocked off. When you put the knob from hot to cold you are shutting a valve to the heater core and blocking coolant from entering or exiting the core. D: If your coolant mix was off, and freezing, your radiator would have frozen also, and odds are you would have popped a freeze out plug out of the block.

    Whatever fix your mechanic did was quick, and odds are it was something very little that was overlooked.

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