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Old 01-04-2010, 09:27 PM   #1
slimgoodie_5
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1992 SL1
Default No heat..thermostat question

Ok i posted a similar question before but i now have another one. i flushed my radiator and replaced the thermostat in my 92 SL1. it seemed like the heat was working but it only lasted for a day or so. the hose that is coming from the thermostat takes a long time to get warm/hot unlike the hose that is coming from the top of the radiator. when a squeeze the hose from the thermostat my engine tends to idle up a lil bit. does that seem like something is wrong with the thermostat? the heat is barely working it just blows out warm air. any suggestions? i was told to put some cardboard over the radiator but with the SL1 i dont see a way to secure it. please help me with this since my wife drives this car more than i do and the next two weeks its suppose to be a cold one.

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Old 01-04-2010, 10:23 PM   #2
doublemm
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Default Re: No heat..thermostat question

Quote:
Originally Posted by slimgoodie_5 View Post
Ok i posted a similar question before but i now have another one. i flushed my radiator and replaced the thermostat in my 92 SL1. it seemed like the heat was working but it only lasted for a day or so. the hose that is coming from the thermostat takes a long time to get warm/hot unlike the hose that is coming from the top of the radiator. when a squeeze the hose from the thermostat my engine tends to idle up a lil bit. does that seem like something is wrong with the thermostat? the heat is barely working it just blows out warm air. any suggestions? i was told to put some cardboard over the radiator but with the SL1 i dont see a way to secure it. please help me with this since my wife drives this car more than i do and the next two weeks its suppose to be a cold one.
Check your coolant level. Esp if everything was working fine before you flushed it.

If you are just a quart or 2 low on coolant, you wont get much heat from the heater core.

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Old 01-04-2010, 10:54 PM   #3
original007
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Default Re: No heat..thermostat question

check the coolant temp in the bottle with a thermometer or if it does not seem hot,your finger. If it is hot you need to flush the heater core.If it does not get hot you have a thermostat issue.By flush I mean remove the hoses from the heater core and give it some pressurized water.Good Luck

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Old 01-05-2010, 08:17 AM   #4
slimgoodie_5
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Default Re: No heat..thermostat question

ok the coolant levels are fine, the temp stays at the half way make and the coolant in the reservoir overflow tank is warm/hot. so i guess i will need to get it flushed again? well this time i might take it to a shop to get it done? i did it with the pressured water but i guess it wasnt strong enough.

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Old 01-05-2010, 11:14 AM   #5
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Default Re: No heat..thermostat question

First, I would check to make sure the flap that controls how much hot air is directed into the air ducts is working properly. Sounds like your coolant is getting plenty warm

You'll need to get up under the dash - when you move the heat lever back and forth, it moves a flap that lets more/less hot air into the ducts. I'm not familiar with 1st gen cars, but if you use the search feature, you may find some pictures/directions
Quote:
Originally Posted by slimgoodie_5 View Post
well this time i might take it to a shop to get it done? i did it with the pressured water but i guess it wasnt strong enough.
you shouldn't need a lot of pressure to flush the cooling system, especially the heater core - too much pressure can actually damage it.

Flushing the heater core is different from flushing the cooling system. You remove the hoses to the core itself and backflush it. The normal cooling system flush does not remove all the water from the core.

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