Question about 1999 Chevrolet Astro

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1999 astrovan heat system

I only get cool air when i turn the temp swicth to hot.

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Check your engine coolant, sounds like it is low.

With the vehicle off and engine cold, take the radiator cap off. If the water level isnt at the top of the radiator neck and/or the adjacent plastic bottle doesn't have any coolant in it...

With the radiator cap off, start the engine and let it warm up. Completely fill the radiator to the top of the radiator neck and fill the plastic bottle to the "fill line" inscribed on the bottle...both with a 50% water, 50% coolant solution.

install the radiator cap and after a minute or so check your heat in the passenger cabin...hope it works well now.

Posted on Jan 01, 2009

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Posted on Jan 02, 2017

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No heat


why not diagnose it and not GUE$$
why not say, if heat fan works, does it????? that is first ?
and if engine reaches and holds at 180F temp or more. does it?
it only takes 2 things to get heat.

1: hot water 180F passing through the core, (easy tests ,ask)
2: air actually flowing through the core.
just 2 things, and easy tests. ask.
getting hot air to where you want it, that is a whole other matter (dampers)

the answer is here. (basics)
http://www.fixkick.com/AirCond/heater.html


Jan 10, 2014 | 1999 Jeep Wrangler

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I have a 05 Buick rendezvous it was overheating so I changed the thermostat. It's still overheating. When I try turn the heat on to help it cool down it just blows out cold air. If its running at normal...


If there are no leaks, you may have a blown head gasket. The heater stops working when air or combustion gasses get into the cooling system.

Jan 30, 2018 | Cars & Trucks

1 Answer

My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

Sep 20, 2011 | 1999 Chevrolet Malibu

1 Answer

Heater stops blowing heat and temp gauge goes up! Heat blows hot again and temp gauge goes down


This is usually caused by air in the cooling system. While the engine is cool, check your fluid level in the coolant tank. Then check the radiator to make sure it is full. If both of them are full, the system has to be bled. To bleed the system, take the radiator cap off, start the engine. If there is air in the system it will bubble out and the fluid level will drop, add coolant until this stops.

Sep 20, 2011 | 1999 Chevrolet Malibu

1 Answer

Tempature gauge shows all the way hot but not over heating then goes back to normal withing 1 to3 minutes.


Your cooling system is low on water the hot rating is coming from the air in the system super heating and then the coolant circulates through bringing the temp reading back down.

Feb 15, 2011 | 1999 Chevrolet Venture

1 Answer

The heat in my car is not working - the fan works but all I get is a cool air. Could this be my thermostat?


Had a similar problem in a different type of vehicle. It turned out that my coolant level in my radiator etc was too low to supply hot fluid to the heater core. Check your coolant level see if that's it. If your thermostat was malfunctioning your car would be running too cool or too hot. Check the engine temp gauge if you have one; but this is a very unlikely source for your problem. If your coolant is low be on the lookout for leaks in the engine cooling system after the system pressurizes(reaches normal operating temperature).

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1 Answer

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Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

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