Question about 1995 Saturn Sl

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Temp raises to hot level after running for 15 min. do i need to change themostat or flush cooling system ?

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Actually, i would recommend o do both. change the thermostat and flush the entire coolant system. this is best.

Posted on Mar 09, 2009

  • Michael Masters
    Michael Masters Mar 09, 2009

    Remember, when replacing the thermostat, to put it inside the housing in the correct manner. it is very easy to insert this device backwards.

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My 2005 Cadillac escalade is running hot change thermostat and flushed out radiator still running hot when released cap it was a lot of pressure coming from coolant


the 3 easiest things/ tests to do would be these,

1 remove cap from cooling system and run until at operating temp, check for bubbles in cooling system, if bubbles then there is a head gasket failure ( exhaust gases in the system )

2 check cooling fans to see if working, most have a high and low, for under a light or heavy load.

3 could have a water pump that has a failed impeller and not circulating coolant

Sep 03, 2015 | Cadillac Cars & Trucks

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2001 Volvo s40 seems to stall and not start for ten to 15 min. Also has high temperature reading that is false as car is not really hot.


You need to look at the temp sending unit it's probably faulty anthor issue with volvo is dirty throttle body's this raises havoc on the car they idle up down all over the map also you should change the thermostat too as a precautionary measure make sure it's the right temp for your year of your car thanx Chris

Mar 04, 2014 | 2000 Volvo S40

1 Answer

Chevrolet k1500 heater


My first question is - are both radiator hoses hot too ? I would want to know if the engine is reaching normal temp or not. The engine coolant needs to be over 100 degrees to make heat for the heater.
You could flush the heater core by using pressure to push water from one heater hose to the other. You could have air pockets in the cooling system which would cause both problems you mentioned.

Jan 23, 2014 | Cars & Trucks

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2001 Chevy Venture - My heat is not as hot as usual and blows cool when idle. Coolant level is fine. Temp Gauge isn't working.


Sounds like you need to have the cooling system flushed out then have them put a new themostat in it. If that dont fix the prob you might have to put a new heater core in it or radiator.

Jan 23, 2013 | 2001 Chevrolet Venture

1 Answer

Accent 2000 runs well then stalls once hot and will not start till cooled off


Check your coolant level and overflow bottle for proper fill. Or try running it With radiator cap loose to see if it still stalls. If it still stalls and coolant levels are good you need to check temp sensor. May be more than One. If you did install a new one, it may have been faulty or damaged. If all that fails then try an idle positioning sensor. The spring may be worn.

Sep 24, 2012 | Cars & Trucks

2 Answers

Instructions on how to use holts wondarwald


Holts Wondarweld
Flush engine.
EXTERNAL CRACKS
1 Run engine until hot,drain off enough coolant to remove thermostat.
2 Remove thermostat.
3 Mix contents of can thoughoughly! and pour contents into thermostat opening.
4 Replace thermostat cover.& fill radiator with hot water,replace radiator cap.
5 Run engine at a fast idle for 15 mins,dont allow to boil.Top up if necessary.
6 Leave Wondarweld in system for 2-3 days then drain off,flush system replace thermostat and refill.
HAIRLINE CRACKS
1 MIX thoroughly and pour into cold engine (radiator if it has a cap)
2 Run engine until hot.
3 Allow engine to cool then run again until hot.
4 Follow procedure 6 above.
INTERNAL CRACKS
1 Follow external crack instructions except after pouring Wondarweld into engine remove spark plug from
affected cylinder and run engine for 20 mins. If more than one cylinder affected run for 5 minute intervals.
2 Allow engine to cool then drain cooling system and refill with clean water.
3 Drain sump & flush,refill with fresh oil.
Note:- 1/2 pint of Wondarweld for every 6 pints of water,DO NOT add antifreeze for at least 3 days after process.

Aug 05, 2012 | Cars & Trucks

1 Answer

96 Century won't circulate heat without raising rpms then stops again at idle. Internal gage show overheating before raising the rpms then after drops to normal or below afterward. V6 with the intake...


I will start with the basics here first, i.e. Your cooling system needs to be properly filled.
A low coolant level will give you peaks and valleys in temp readings because the sending unit is not in constant contact with the coolant; it is just splashing on it (like dipping your finger in and out of a cup of hot coffee). For best results the sending unit needs to be in constant/direct contact with the coolant to measure its temp.
To fill your system:
Start with a cool engine and have everything you may need ready i.e. funnel, coolant, helper to rev engine.
Try revving the engine up to 2000 RPM's while topping off the radiator, then put radiator cap on while still revving engine. Return to idle.
Make sure your overflow tank is not too low either.

If that is not your problem then let's look deeper.

What color is your anti freeze? Factory "orange" is not good in my opinion.
Orange coolant can gel-up and clog your heater core.
You may need to purchase a "cooling system flushing kit" or pay to have it flushed out.

Do not reuse orange coolant. Revamp it with either the old green stuff or ask your parts man what's best.

This happened to my 1996 s10 blazer; turned out to be a restricted heater core.
My heater made a gurgling sound at certain rpm's, and did not heat well at all.

I flushed it out (the whole cooling system) following the instructions on a acid based flush kit and refilled it with the green coolant.
After the flush the gurgling sound was gone and I could not believe how much it improved the whole system; especially how hot the heater blew.

My blazer came with the orange coolant from the factory.
I was told if your level gets low with orange, it will thicken up.

I would also check for any kinks in your heater hoses just as another possibility.

Good luck!

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2 Answers

Heater core problems no heat changed thermostat still no heat any ideas


try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

1 Answer

How do you flush,refill cooling system


When the engine is cool, open the plastic(black) drain at the bottom of the radiator. I should mention you'll need a drain pan, but, you knew that...lol. If you can jack the rear of the vehicle up a few inches this will help empty certain areas within the engine. Close the drain plug and fill with cool water, " DO NOT" put the radiator cap back on. Start the engine and turn the climate control inside to hot and "heat". Running the engine watch from out side the level will rise and drop when it drops keep adding water until the thermostat opens, you'll know by the temp of the top radiator hose. Let the ngine run for about 10 minutes, then turn off. Later, when cool again, drop the back end of the vehicle to the ground. Open and drain the radiator entirely. Fill with aproppriate amount of anti freeze, 4 cylinder 4 quarts, six cylinder 6 quarts etc. Run engine till warm again and themostat opens fill with remaining water. And top of the over flow tank. Cap off the radiator and you're done. Keep a close eye on the temp for a day just in case there was an air pocket in therre.

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2 Answers

Olds silhouette heater blows cold air


as long as the engine temperature is normal, i would suspect a clogged heater core, the dex-cool antifreeze is notorious for building up deposits in cooling system. have heater core flushed first to see if it makes any difference

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