Question about 1999 Saturn SL

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Flushed my 99 saturns heater several times. Heater will work for a month or less and stops again. It has gunky stuff in it every time. What is causing this and what can I do to fix my heater?

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Keep flushing till all the gunk is gone, and change your brand of antifreeze, and check the Water you are mixing it with, may have a lot of minerals or whatever

Posted on Jan 07, 2009

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I have a 2001 saturn sl2. No heat. I have flushed heater core today and replaced thermostat. Heater lines are warm. No other problems or leaks. What is causing no heat? Its cold all the time.


If after running the engine for 5 min both heater hoses are hot, it could be a blend door problem where air is not flowing thru the heater core. You may need a shop manual to troubleshoot the control.

Nov 23, 2015 | Saturn Cars & Trucks

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Saturn overheating


the stuff describe most likely from the anti boil -anti freeze mixture that has become ineffective for not being changed regularly and not up to percentage to do the job. It allows the aluminium parts of the car to corrode and what you see is the end result . It will deposit in the cores of the radiator and block them up resulting in a replacement radiator . You can expect corroded aluminium parts from all areas of the motor.

Apr 22, 2014 | Saturn L Cars & Trucks

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When i turn on my heat it smells like coolant


the lines to the heater core may be leaking, or the heater core may be blocked, or split. try flushing the coolant system. If that magic fix the head gasket stuff was used, eh.. It may need flushed several times or replaced. I wish you good luck with your volvo, and hope it lasts forever! (owner of a 740 with very high miles!)

Oct 17, 2013 | 1999 Volvo V70

1 Answer

Hi. Actually I have VW Passat 2003 which recently stopped blowing hot air through the vents. The fan is still working but no hot air. A friend tells me that the unit that regulates the flow of hot water is...


Scale builds up in the bottom of the heater core. When it gets high enough, it chokes the flow of hot fluid and the fan can only supply cool air. When mine was doing that I disconnected the in and out hoses at the fire wall and flushed it out with garden hose pressure. A lot of junk came out. I reconnected the hoses and bled the air out. It worked good immediately. Two weeks later it happened again. I did repeated the procedure with equal results. It happened again every several weeks for about five or six times, each time lasting a little longer than the last. I guess I need to flush the whole engine out to get all the junk out instead of just the heater core. BTW, the stuff that comes out looks similar to sand if you capture it in a bucket. It sinks to the bottom of the water so you can see it. It must be sinking to the bottom of the heater core, too, and that's why it chokes the flow off.

Aug 18, 2010 | 2003 Volkswagen Passat

3 Answers

99 SAAB 9-5 PROBLEM WITH AC....AC IS WORKING.. CONDENSING WITH NO PROBLEMS ...WATER RUNNING OUT UNDER CAR..PRESSURES ARE 225 HI 35 LOW... NOT GETTING COLD AIR INSIDE...LUKE WARM ON DRIVERS, AND COOLER...


OK, most cars have heater cores that get hot but the blender door directs air away from this core in the a/c mode when you want cool air from the evaporator.

I'm not sure if there is a control valve which stops the water from going through the heater valve.

I think the part is called a 'heater blend door actuator' that you are after.
http://www.autoanything.com/air-conditioning-65-861/201A1060.aspx?kc=AFFCJ&mr:referralID=c9ca506d-9f22-11df-bf8d-0026b95a1738


Aug 03, 2010 | 1999 Saab 9-5

1 Answer

1999 saturn sl1 wagon has overheating problem. Had a leak in the reservoir so I replaced that. During that time had added stop leak several times. Reservoir is now new, but still losing water at speeds...


If you cant see any water coming out anywhere then the only choice is a blown head gasket.

The reason the resorvior had a leak was the pressure from the engine got into the coolant and blew up the reservior bottle. This is a real common problem with saturns.

Get the car inspected. A simple test a a reapir shop will confirm this.

Be sure to flush all the stop leak out or it will clog the heater core up and the heater will not work.

Jan 04, 2010 | 1999 Saturn SL

2 Answers

No heat in 99 saturn sl1 fan blows but little heat


One or more of:

1. Your coolant is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Dec 13, 2009 | 1999 Saturn SL

1 Answer

99 saturn no heat or defrost


Sounds like your heater core is mostly stopped up. You need to have your cooling system back flushed and cleaned.

Sep 12, 2009 | 1997 Saturn SL

2 Answers

98 jeep wrangler no heat


Try this disconnect the heater hoses from the heater core use a hose to backflush the core. Then reconnect and try again.

Oct 18, 2008 | 1998 Jeep Wrangler

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