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

Posted on Dec 14, 2014

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Posted on Dec 10, 2014


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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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there should be an emissions sticker on the hood or the radiator support to show you where they go,or you can go pick up a repair manual for about $20 with diagrams in it to show where they go,hope this helps

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

The heater core is on the passenger side under the dash within the heater airflow contoller box. If you had Xray vision and could look straight through the glovebox, then you would see it. The heater control vale for the water flow is on the passenger side top of the engine near the firewall. It will have a domed top with a vacuum line to it and it is placed into the heater core supply hose.

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1991 camaro overheating

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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I have a 1991 4Runner. The heater throws cool

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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