Heater problem

[jeeper31]

Just replaced water pump and thermostat. Flushed coolant out and added new. Now the heater takes a long time to get warm and never seems to get as hot as it should.

Opinions?

[78F350]

Originally Posted by jeeper31

Just replaced water pump and thermostat. Flushed coolant out and added new. Now the heater takes a long time to get warm and never seems to get as hot as it should.

Opinions?

First guess is that the foam that covers the heater duct flaps is gone, so the air is not being forced through the heater core.
Check this thread: http://986forum.com/forums/performance-technical-chat/42802-interior-vent-debris.html

[paulofto]

Originally Posted by jeeper31

Just replaced water pump and thermostat. Flushed coolant out and added new. Now the heater takes a long time to get warm and never seems to get as hot as it should.

Opinions?

Okay, so the heat was fine before you changed the pump and thermostat? Not to discount 78F350 but I would venture that the heat issue has something to do with the pump and/or thermostat. General rule of thumb; look at what you last did before the issue arose. Air in the system, coolant level, DOA faulty thermostat or pump could all be part of it. Some questions; Does the temperature get to ~180 F? Does it say there? Does it rise and/or fall when the heater is activated?

[Gelbster]

You have an air pocket (WAG)
Airlift or use the burp valve.Search for more.Pelican has the diy

[jeeper31]

Originally Posted by paulofto

Okay, so the heat was fine before you changed the pump and thermostat? Not to discount 78F350 but I would venture that the heat issue has something to do with the pump and/or thermostat. General rule of thumb; look at what you last did before the issue arose. Air in the system, coolant level, DOA faulty thermostat or pump could all be part of it. Some questions; Does the temperature get to ~180 F? Does it say there? Does it rise and/or fall when the heater is activated?

I think the heat wasn't as good as it should be before I did the water pump.

Originally Posted by Gelbster

You have an air pocket (WAG)
Airlift or use the burp valve.Search for more.Pelican has the diy

If I had an air pocket wouldn't the heat be intermittent? Start off hot then go cool for a bit then back to hot?

[bwdz]

I second the air pocket. It is difficult to get all the air out. Bleeding is a must. Also, take the car out for a few spirited runs and rebleed and then do it again. I have experienced this long bleeding process on several other cars and had to really get them up to temp and bleed and then do it again as many as 3 times. Oh yeah, have the heat on high but the fan on low.

[jsceash]

Originally Posted by jeeper31

I think the heat wasn't as good as it should be before I did the water pump.





If I had an air pocket wouldn't the heat be intermittent? Start off hot then go cool for a bit then back to hot?

The heater supply and return on 2 small hose under passenger seat so it's easy to get air trapped. Try the air lift if you have one or burp the tank valve if you don't I've even laid under the car and squeezed the hoses alternately.

[Jamesp]

A major problem is the foam in the heater box disintegrating


[img]

Not sure why the pic is upside down, but when the doors lose their foam, you get mildly warm heat, and mildly cool AC.

[jeeper31]

Originally Posted by jsceash

The heater supply and return on 2 small hose under passenger seat so it's easy to get air trapped. Try the air lift if you have one or burp the tank valve if you don't I've even laid under the car and squeezed the hoses alternately.

Can you use the air lift with the coolant in the car or do you have to drain and refill?