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)

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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?

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Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
IF the trans is overheating the engine CAN overheat

They share the same cooling source and trans fluid gets hotter than oil, but yet it has a wimpy cooler built into radiator. Maybe add trans oil cooler to system.

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