I was driving my 1991 toyota pickup when it started to overheat i let it sit and cool down then drove it home stopping evertime it got to hot i looked under the hood and found the alternator belt broke I replaced the belt but it still overheats and heats up fast and the heater blows out cold air.

Check crank shaft and sensors.

Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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Delay starting on Toyota Prius?

http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

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Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

Do you know if the cooling fan works ?
Have you checked the coolant level in the radiator ?

This sounds like your cooling fan is not running. If you were to stop too long with with the engine idling it would overheat the engine. I hate to be the bearer of bad news but this is a very serious issue. I can have a number of causes, like bad cooling motor, bad wiring or conectors, bad relay, open fuse, etc. Please have it diagnosed and repared before it overheats the engine and possibly damages the engine. If you are stopped in trafic you can place the transmission in neutral and shut off the engine. When trafic restarts you can restart the engine and place the transmission in drive again and continue. I hope this helps.

Try with the small stuff first. Replace the thermostat. Before you do that, you should flush and refill your system with just water after the flush process. The bottle of solution that you put into your radiator to flush it and clean it has instructions, follow those. Then let the car cool down and drain the system and refill it with fresh water only. Run this water for a bit and then do it once more. Once cooled back down , replace thermostat and replace the 50/50 mix of antifreeze and water.
Check engine oil level as well, low oil will overheat engines quickly.
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!!

Possible bad fan clutch or clogged radiator.

It may be the CRANK SENSOR ,i had a car one time,it started fine,and drove fine one day i drove it about15 miles,stopped ,got back in it, started it, drove about 5 miles ,and cuts of with a little hesitation,it cranks but does not run, i sit there for about 20 minutes,crank it, it starts back ,i drive it back another 15 miles ,and runs great ** the crank sensor gives the signal to the ECM if the ECM ,never get that signal ,it does n't know to crank the car,or what cylinder to start with,check with your saturn ealer ,and get a second opinon

is the radiator low on coolant? dont think you have a bad head gasket, does sound more like a bad cooling fan and/or thermostat

original issue sounded like thermostat but now that you have lost power i would have to say thermostat, blown head gasket, and warped head

to check thermostat find and remove place in pot of boiling water the see if it opens, then to ice water to check if closes.


the only way i know to check headgasket and head is to check oil and water. oil will have water in it, and water iw have oil in it

replace the control moddule .its under the hood along the fire wall . i had a ford pickup would start fine . untill the moddule would get hot and shut off the motor it would crank and crank but if i let it sit and cool off it would start right up as if nothing was worng .let me know if you find the module . you might need to by a clymers book at a auto store and it'll tell everything there is to know about your car and were and how to find and replace everything