No heat?

[RobP]

I've recently installed Classic Auto Air in my original a/c car. At this point I'm just working on the heat and can't seem to get any heat from the vents. I've bled the system but I'm not getting any coolant in the lines coming out of my water pump (they aren't anywhere near the temp as the radiator hose). When I bought my car everything heat/ac related was deleted from the firewall forward and the 2 holes on the water pump were capped off. I have the front hole connected to the water valve line and the other connected to the rear of the water pump.
I don't know much about water pumps, but does anyone know why coolant wouldn't be flowing through?

 

[dieseldazzle]

They are flow directional.

 

[gkent]

"directional" ... this only means that if you hook the hoses up backwards water will flow in reverse through the heater core - not correct but no big deal - you should still get heat.

Maybe look at the a/c unit in the car to see if there's a diverter valve - which is quite common on a/c units. If so, its probably diverting the coolant past the heater core. The purpose of this is, if you're running your a/c you don't want a hot heater core in the in the box. But you should still have heat in the hoses.

If there's no heat in the hoses the maybe there is a valve in the system to stop flow completely (instead of a diverter valve). No flow = no heat.

How do the controls operate - electric, manually or vacuum ?? Check they're all properly hooked up and operating correctly.

 

[dieseldazzle]

Ya but if common sense fails look at it all...

 

[RobP]

The A/C side of the system isn't hooked up yet. The heater side has an open/close water valve and it's working. I just pulled the hose connected to the water valve and it has coolant in it, so there is some flow from the water pump. The water valve opens and closes so that's not the issue. I wonder if there's still air in the system? With essentially a fresh installation, there is surely a lot of air in the hoses and the heater core. I raised the front of the car and used a Lisle funnel that seals around the cap. There were some bubbles in the funnel, but I would have expected more. I let the car run for about 15 minutes (about 10 minutes longer than I saw bubbles). Before I tried the funnel I just let it idle with the cap off for two 15 minute sessions and that clearly didn't work.

Any other ideas?

 

[texas69bee]

I think your on the right track on trying to burp it. I had problems burping it as well. I ended up buying a stant thermostat. It's basically the same as drilling a 1/8 hole in the one you have. If your going to pull the thermostat to drill a hole, boil a pot of water to see if it's opening and closing. Use a meat thermometer to get temp the same as thermostat.

 

[gkent]

I know this is an aftermarket unit but what does the FSM say about "burping" a heating system. I've never done that. I think if the hoses are hooked up correctly "burping" shouldn't be necessary ... the inlet side will feed the bottom of the core pushing the air out the top and back to the waterpump and up into the rad.

 

[RobP]

I know this is an aftermarket unit but what does the FSM say about "burping" a heating system. I've never done that. I think if the hoses are hooked up correctly "burping" shouldn't be necessary ... the inlet side will feed the bottom of the core pushing the air out the top and back to the waterpump and up into the rad.

I was thinking the same thing. I'm switching around the hoses at the water pump. According to the FSM, the inlet nipple is the one closest to the block and I believe it should be connected to the hose with the water valve. The tech at Classic Auto Air said it connected the other way, but he may have had the inlet/outlet reversed. Since there is a water valve on the inlet hose, I think the connection of the hoses is pertinent. As soon as everyone's awake here, I'll be testing it.

 

[RobP]

Got it! These needed to be removed. The manual doesn't tell you to remove them and they look like they're supposed to be there (to me). Now onto the A/C...

 

[gkent]

Are you ******* shitting us ... you seriously thought those belong there !!

Make sure you take the red one's off before you connect those lines!

 

[RobP]

Are you ******* shitting us ... you seriously thought those belong there !!

Make sure you take the red one's off before you connect those lines!

Harsh, but true

Another mistake to learn from....