Question about 1994 Saab 900

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I have a 1994 Saab 900SE. It is running hot but there is no leakage of fluids and the fan is working. Does the radiator needs flushing or do I need a new thermostat?

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Are you loosing coolant, if so you might just have a leaking heatercore. A weak headgasket will also make your saab run hot.

Posted on Jan 05, 2010

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The leak can be in form of steam /. mist from the freeze plugs on the engine block.

Coolant system should be flush every 2 years or 24,000 miles.

As a preventive measure,you should replace the $15 thermostat every 6 years and check the radiator/coolant cap condition.

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Posted on Dec 25, 2009

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1994 chevy s10 getting hot. Changed the thermostat. Thermostat is good. Flushed the radiator and added new coolant. What else may cause it to get hot?


if it running a viscous fan hub( fan clutch) change that as it is not pulling air through the radiator

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2001 caddy Deville 4.6 only runs hot while driving with ac on .rad. water pump and thermo. Has been replaced and fans work.help


check fluid level --radiator may need to be clean externally--may need a flush --recheck fans for proper speed

Jul 06, 2016 | AC Cars & Trucks

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I replaced thermost and fan still running hot


The car is old enough for the radiator to clog. Get a flush kit to the car(at any auto parts store) and a bottle of flush. Flush the radiator out. If it won't flush out. You may need to go to the radiator shop and have them rod the radiator out. It beats the price of a new one. The build up chemicals in the water and coolant, clog the vents inside the radiator. I hope this helps,

Jan 17, 2011 | 1994 Acura Legend

4 Answers

Running hot


Too many possibilites. Even old spark plugs can make it run hot. Slipping belts also possible. Bad thermostat is common. Retarded ignition timing can do it. Problems with the radiator fan motor/relay/sensor can do it. Low coolant is possilbe. Head gasket is worst case scenario. I would not suggest a flush this new. But you could run a pressure check on the radiator. See if it holds pressure. Also verify with a thermometer, because the gauge could be off instead.

Mar 04, 2010 | 2002 Ford Taurus

2 Answers

My car is over heating


There are a lot of things to check. First, the coolant level, then to determine if the cooling fans are operating when vehicle begins to get warm/hot.

If you're heater is not providing heat usually indicates low fluid level or restricted system. You can't just go by the coolant resivoir, a leak in the system will cause the system to use fluid and not draw the excess into the engine, making it appear your level is good when it is not. You have to check the radiator level, it must be full.

Coolant loss indicates the need for pressure testing to identify the leaking component/gasket. Unless you have the equipment to hook up to bring the system up to about 13 or so pounds, you will need to have this done. It could just identify a heater hose, or radiator hose leaking, though you should inspect for leakage also.

Any leakage inside the passenger compartment that involves anti-freeze near the firewall/floorboard indicates a heater core leaking.

Make sure the radiator cap is sealing by inspecting the seal and the area it contacts.

If the fans don't kick on when the car begins to get hot, then possibly the cooling fan switch is not working properly or the coolant temperature sensor in some cases.

good luck

Feb 21, 2010 | 1997 BMW 328

1 Answer

1994 Saab 900 S convertible running hot


You don't say whether your electric fans both work...

First, check fuses #25 and #6 (both 30 amp)

There is a fan thermoswitch is on the left side of the rad. Turn the ignition on, and after pulling back the boot, short across the two terminals with a screwdriver.

If the fan runs, fan and wiring are both good, but thermoswitch might be faulty.

If fan only runs when thermoswitch is shorted like this, switch needs to be replaced (I strongly recommend that you get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market one! The SAAB stats are three position, and most after market ones aren't)

if the fan doesn't run when switch is shorted, check for voltage between green wire and ground at the switch.

Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box for the A/C rad fan, and also check relay G - it's for the rad fan.

Hope this helps!

Saabreur

Jun 22, 2009 | 1994 Saab 9 3

1 Answer

1994 9000C Runs hot


Could be the fan thermoswitch. The thermoswitch, if there is one*, is located on the lower portion of the radiator just in front of the turbo outlet pipe. Here is a picture.
You may also have one of the fan relays failing. (On some cars, there were two relays, one for low speed and one for high). Here is a picture.
For general diagnostics of the cooling system, go here.
2 stage cooling fan wiring diagram here.
This also will tell you where to find other components to check, like the fan speed resistor, and provide other diagnostic checks.

Oct 16, 2008 | 1994 Saab 9000

1 Answer

Cooling system on 1994 ford thunderbird


does it run hot while driving or in traffic?
if running hot at idle could be water pump not circulating enough try revving engine some and see if temp comes down. also check your fan clutch.
if running hot going down road probably radiator

Sep 10, 2008 | 1994 Ford Thunderbird

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