Question about 1991 Chevrolet Camaro

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I need vacuum line schematic for a 1991 chevy camaro rs v8?

Change heater core, heater control valve and did a radiator flush with a plain rushing water hose, and still unable to get heat. now I am hearing a hissing sound.

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Chevythunder.com

about half way down you will see the diagram for 1988 thru 1992 vacuum line

Posted on Dec 14, 2014

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Http://chevythunder.com/fuel%20injection%20vacuum%20lines.htm.

Posted on Dec 10, 2014

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1 Answer

Where's the radiator flush valve in the 2000 cadillac cater?


Dont flush untill you have removed the heater control valve because it has a piston and diaphragm setup vacuum on the line will cause the diaphragm to expand and not close causing the valve and hose to fail no matter how tight you clamp it. heater control valve is located at rear of engine bay passenger side near heater core hoses.

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This may be one of those where the entire dash has to come out to do the heater core.
But you only want to replace the core if it is plugged, or leaking. There is an easy way to tell if it is plugged: with the engine at normal operating temperature, and the control valve open so coolant will circulate, now feel both heater hoses. If core is blocked, only one hose will be hot. If core is circulating correctly, both hoses will be hot. If they are, you don't need to change out the core. One of your vacuum actuated doors is the problem, the blend door that lets air from the blower motor pass over and around the heater core.

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I need to hook up all the vacuum lines to my 91 rs camaro v8 305 small block but i dont no were they go?


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Oct 21, 2009 | 1991 Chevrolet Camaro

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Had radiator flush. Even before this was done,


A few things to consider when diagnosing poor heater
  • Flushing the radiator doesn't do much in terms of heat. The heater core should be flushed to get rid of anything accumulated in there over the years.
  • How hot is the engine actually getting? If the thermostat is stuck open the engine may never reach proper operating temperature.
  • With the engine at operating temperature feel the hoses going into the heater core, are they hot? Some vehicles use a heater control valve that only flows coolant through the heater core when activated. They work off of vacuum and it isn't uncommon to find a broken vacuum line at the valve.
  • Are the doors in the heater box operating correctly? Can you hear the heater door inside the dash open when you select heat?
I hope this helps in getting your heat to work for the upcoming season.

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Where is the heater control valve on my 1995 camaro 3.4 v6


If yours has a control valve, it will be inline in a heater hose just ahead of the firewall. before taking it out make sure it has a vacuum line attached. If I remember correctly, default is heat. I hope you checked the vacuum motors on the heater box and made sure that the plenum doors are operating and not jammed while you had it out!!

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Need to know where the heater core and heater control valve are for a 2000 chevy silverado 1500 v8. not sure if it has a heater control valve


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2 Answers

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Possibly a bad hose to the heater core or the heater core could be plugged,especially since you describe getting no warm air from the heater and coolant flowing between motor and transmission,the cooling fan could be a bad thermo switch or relay,as far as the freeze plugs most likely not,the coolant would flow out of a bad freeze plug as soon as you started filling it,you should go back to your "mechanic" and demand a refund,I'd say demand a repair but I don't think this guy can fix is own hair,it sounds like he was hoping and groping for a solution,at the very least file a consumer complaint with your states attorney general and cosider a small claims suit.

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1 Answer

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check for a vacuum operated heater valve located on the engine side of the firewall. This black plastic valve has a vacuum line to it as well as hot water inlet hose from the cylinder head and a heater by pass hose. The vacuum line may be off, but even if you have good vacuum to the valve, the internal diaphragm may be torn--so no operation of the valve and no heated coolant to the heater core. I you have a vacuum test tool (a small vacuum pump with a gage) you can test and see if the valve will hold vacuum. If not, the diaphragm is damaged and you will have to replace the valve.

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