Early-Fuel-Injection

Good day everyone,

I purchased an 84 vette last year. One owner with 49k on the clock. It was a pretty good purchase. The individual before me took out the heat/ac. I have reading the massive service manual to see what I need to do to get the heat/ac working again. A few questions.

How would I get heat back into the car? Components/ process etc?

How would I get /ac back into the car? Components/process etc?

Thank you for your time

ls777z

Did they just take out the heat/ac components or are all the controls/etc missing as well? Overall the easiest way would be to find a donor car.

Early-Fuel-Injection

I appreciate your reply. From looking at the car this evening they took out heat/ac components. The controls are still there.

confab

Pictures of the affected areas would help..

Hot Rod Roy

Huge project!!

Early-Fuel-Injection

Hot Rod Roy

If those pictures are of your car, I sure don't understand your post #1! The only thing I see missing is the high pressure safety switch on the back of the compressor. That item is probably stuck somewhere under the compressor. It's broken, so the safety function won't work, but your a/c will still work fine. It's just the "safety" function that won't work, in the event your head pressure goes too high. That would only happen if there were some other failure to cause your head pressure to go too high. A very rare situation.




What is your problem?

Early-Fuel-Injection

Thank you for the info. I'm a novice at understanding heating an ac systems lol. I guess the problem is I do not have heat. I live in Alaska so the mornings are still a little chilly. The gentleman I got it from inherited it from his father in law. He did not like the car. I am going off that. I will look for the high pressure safety switch on the back of the compressor. If I have all the components of the heat/ac system here are some more questions.

Am I missing a heater core?
Do I need to recharge the AC?

Hot Rod Roy

You guess? You don't know whether you have heat? It should be rather obvious if you live in Alaska!

The a/c system is to make you cold. You don't need it to make you hot.

The heater core is in the lower left corner of your picture #1. Does the vacuum solenoid (shown) operate when the engine is running, and you move the heat control lever from the "off" position to the "heat" position? Do the two hoses to the heater core get hot when the control lever is in the "heat" position?

Early-Fuel-Injection

Lol it's been a long day. My brain is just tired. I will try to check those hoses tomorrow.

Early-Fuel-Injection

Howdy! So I felt the two outlets that go to the heater core. They were warm after a long drive.

Early-Fuel-Injection

So i've been doings some reading about this system in the 84 c4. If I am wrong let me know. So it appears to me that a BLEND DOOR ACTUATOR MOTOR is bad.

In addition maybe I need to recharge the A/C. It sounds like without the a/c being charged the heater will not work since the systems are interconnected.

Hot Rod Roy

Cruisinfanatic

Wrong. Lots of folks have just fine heat with no ac

Early-Fuel-Injection

I am confused. So I was reading some of the others post about heat. I got a new Blower Motor Resistor but it was too small. So I need to take it back. When I move the panel for the heat the flap does open. I took the resistor off and saw that. The blower works because I can hear it. Could it be the thermostat?

Early-Fuel-Injection

Thank you for your time. I appreciate ruling that out. Trying to find information on all of this is quite troublesome.

Hot Rod Roy

In post #9, I asked you about the heater control vacuum solenoid. Please answer that question.

What does your engine temperature gauge say? Those tubes at the heater core should be quite hot.

This is a different comment. Do any of the fan speeds work on your dashboard control panel? What inspired you to replace the blower motor resistor?

Please answer these questions. We can't help you if you ignore our questions.

Hot Rod Roy

What books have you been reading about the '84? This may be the cause of your confusion. There is no "blend door actuator motor" in the '84. The Factory Shop Manual is the right book to read!

Early-Fuel-Injection

I appreciate your patience. Here is what I got.

I have attached pictures of what my temperature gauges said after 30 minute warm up. I left work a little later than I wanted to.

After moving the lever to heat I felt those tubs to the heater core. Thirty minutes later and they were hot hot.

I have took pictures of the blower motor resistor. I am finding the previous owner did not take care of the car that well. I guess newer parts cant hurt. The part was too small as you can see in the pictures.

I tested the fan speeds and all of them worked.





What is this? It isn't going to anything.

The same item is laying here not going to anything.

Hot Rod Roy

That is the other half of the "high pressure safety switch" I mentioned. It's shown in my picture. That's got NOTHING to do with your lack of heat.

I suspect that Haynes manual should be used to line the bottom of your bird cage. Maybe to wrap fish guts, if you're a fisherman!

There is a second book for your FSM . . . the "Electrical Troubleshooting Manual". I use that book more than I use the big book.

Back to my very first question . . . still no answer from you! Does your heater vacuum valve work?????????? Is that a difficult question?