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post #1 of (permalink) Old 03-15-2017, 08:18 AM Thread Starter
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No Heat??

We had a bad snowstorm in my area yesterday, dropped 12-18 inches on my car. So since I had to come into work today, I had to dig out my car. I remember starting it and there was some black soot on the snow behind it, and I had to rev a little getting out of my spot this morning.

Anyway, driving to work, I noticed the car wasn't giving me any heat and the temp was hovering between 200-215. It was closer to 230 when I moved it down the street a little while later.

I checked the sntifreeze and it looks full. It's been suggest that maybe it's frozen or the thermostat is bad, maybe a hose, something with the blend door,or worst of all the dreaded head gasket.

Can someone point me in the right direction and fast? The last time I had problem like this the car wound up being towed.
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post #2 of (permalink) Old 03-15-2017, 03:54 PM
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My 21 year old daughter lives 5 hours away, she has an 01 buick. Her thermostat hung and evidently it tripped the check engine light and auto zone sold her the part, which she brought with her last time she came home. She had no heat, replaced it for her last time she got home and her heat returned. Don't know if your car year model would do the same if it has sensors for that with regards to tripping a code, would think it should if it is 7th gen. Would certainly be worth checking if there were any tripped related codes.

With that being said, not so sure I would suspect you have a thermostat issue. If it was stuck open your car would probably not run that warm, and with circulating coolant getting that warm you should have heat. With your coolant being at normal level probably also unlikely you have a blown head gasket, although it is still possible. You would likely see cloudy milky oil on your dipstick if you had a blown head gasket.
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Feel the hoses coming from the heater core with the engine running. If one hose is really hot and the other is much cooler the heater core is plugged and will need to be cleared out. To do this you would remove both hoses from the heater core and use a garden hose and try to spray out the clog by spraying threw both hoses at the core.

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post #4 of (permalink) Old 03-15-2017, 08:24 PM
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Originally Posted by hg3300 View Post
We had a bad snowstorm in my area yesterday, dropped 12-18 inches on my car. So since I had to come into work today, I had to dig out my car. I remember starting it and there was some black soot on the snow behind it, and I had to rev a little getting out of my spot this morning.

Anyway, driving to work, I noticed the car wasn't giving me any heat and the temp was hovering between 200-215. It was closer to 230 when I moved it down the street a little while later.

I checked the sntifreeze and it looks full. It's been suggest that maybe it's frozen or the thermostat is bad, maybe a hose, something with the blend door,or worst of all the dreaded head gasket.

Can someone point me in the right direction and fast? The last time I had problem like this the car wound up being towed.

Did you check the engine coolant in the radiator, while the engine was cool - or did you check the level in the overflow jug?

If you checked the jug - I would check the radiator. I suspect you are low on coolant and have an air pocket in the system.
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post #5 of (permalink) Old 03-17-2017, 09:57 AM
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Originally Posted by hg3300 View Post
We had a bad snowstorm in my area yesterday, dropped 12-18 inches on my car. So since I had to come into work today, I had to dig out my car. I remember starting it and there was some black soot on the snow behind it, and I had to rev a little getting out of my spot this morning.

Anyway, driving to work, I noticed the car wasn't giving me any heat and the temp was hovering between 200-215. It was closer to 230 when I moved it down the street a little while later.

I checked the sntifreeze and it looks full. It's been suggest that maybe it's frozen or the thermostat is bad, maybe a hose, something with the blend door,or worst of all the dreaded head gasket.

Can someone point me in the right direction and fast? The last time I had problem like this the car wound up being towed.


What did you determine?
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post #6 of (permalink) Old 03-17-2017, 05:23 PM Thread Starter
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Quote:
Originally Posted by 12 lt View Post
My 21 year old daughter lives 5 hours away, she has an 01 buick. Her thermostat hung and evidently it tripped the check engine light and auto zone sold her the part, which she brought with her last time she came home. She had no heat, replaced it for her last time she got home and her heat returned. Don't know if your car year model would do the same if it has sensors for that with regards to tripping a code, would think it should if it is 7th gen. Would certainly be worth checking if there were any tripped related codes.

With that being said, not so sure I would suspect you have a thermostat issue. If it was stuck open your car would probably not run that warm, and with circulating coolant getting that warm you should have heat. With your coolant being at normal level probably also unlikely you have a blown head gasket, although it is still possible. You would likely see cloudy milky oil on your dipstick if you had a blown head gasket.
The theory is that the thermostat is sticking closed. I did get heat briefly on Wednesday but it quickly went away and the engine seems to reach high temp at random. I think it's more likely to happen on hills and in traffic but it did happen when driving down the highway twice, so I think I can rule out 'going up hill/stopping at lights' as a reason.

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post #7 of (permalink) Old 03-17-2017, 05:25 PM Thread Starter
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Originally Posted by Bart77 View Post
Feel the hoses coming from the heater core with the engine running. If one hose is really hot and the other is much cooler the heater core is plugged and will need to be cleared out. To do this you would remove both hoses from the heater core and use a garden hose and try to spray out the clog by spraying threw both hoses at the core.

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Originally Posted by 1999 White C5 Coupe View Post
Did you check the engine coolant in the radiator, while the engine was cool - or did you check the level in the overflow jug?

If you checked the jug - I would check the radiator. I suspect you are low on coolant and have an air pocket in the system.
Thermostat, heater core, radiator...I will make note of them and check the hoses and radiator to see if there's issues with either of them.

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What did you determine?
Nothing yet, will be taking a look tomorrow morning. Hopefully my car gets up to my uncle's garage with few problems. I may end up pulling over a few times though.

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post #8 of (permalink) Old 03-17-2017, 08:21 PM Thread Starter
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Okay...so weird behavior when driving up to my uncle's...car did get hot a few times (which is not unusual) but cooled down when driving UPHILL and got warm when driving DOWNHILL (trying to search these symptoms on Google was a pain in the ass because most of the results were the opposite). And the heater seemed to be functioning, though it didn't do much for my engine temp.

The fan came on a few minutes after I parked and turned off the car, probably one of the few times it's done that (all things considered, the engine was never this hot when I parked the car)

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post #9 of (permalink) Old 03-18-2017, 06:42 AM
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Quote:
Originally Posted by hg3300 View Post
The theory is that the thermostat is sticking closed. I did get heat briefly on Wednesday but it quickly went away and the engine seems to reach high temp at random. I think it's more likely to happen on hills and in traffic but it did happen when driving down the highway twice, so I think I can rule out 'going up hill/stopping at lights' as a reason.
Could be.

Not changed on on that particular car, but should be easy enough to get to. Some of these gm cars even use a gasket instead of having to use permatex, my daughters buick I mentioned with the 3800 had a rubber gasket which was a few dollars and was right there in the front and easy.

Would be sure to test your coolant too.

Good point on the heater core too, most experiences I have had with bad heater core, they leaked in the floor board, but that is not always the case, they can and do sometimes get plugged up with showing no other obvious signs they are bad.
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post #10 of (permalink) Old 03-18-2017, 04:53 PM
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Originally Posted by hg3300 View Post
Okay...so weird behavior when driving up to my uncle's...car did get hot a few times (which is not unusual) but cooled down when driving UPHILL and got warm when driving DOWNHILL (trying to search these symptoms on Google was a pain in the ass because most of the results were the opposite). And the heater seemed to be functioning, though it didn't do much for my engine temp.

The fan came on a few minutes after I parked and turned off the car, probably one of the few times it's done that (all things considered, the engine was never this hot when I parked the car)


I still suspect your cooling system is low on coolant. Did you check the coolant level in the radiator when the engine was cool?
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post #11 of (permalink) Old 03-18-2017, 06:44 PM Thread Starter
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The coolant was low, yes. And I filled the radiator after changing out the thermostat. But the problem persisted.

So I went to the Auto Zone and got a radiator cap, and that fixed the problem. Apparently the old one wasn't working properly, but everything appears to be running smoothly now.

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