heater question

[68c10owner]

My heater blows really good but it doesn`t feel to hot. It`s more warm than anything. What can I do to make it blow hotter air?

[tvblazer78]

Originally Posted by 68c10owner

My heater blows really good but it doesn`t feel to hot. It`s more warm than anything. What can I do to make it blow hotter air?

What thermostat is in it? If it is a 160 that could be part of it. One more thing I would do is flush your coolant.

[68c10owner]

Originally Posted by tvblazer78

What thermostat is in it? If it is a 160 that could be part of it. One more thing I would do is flush your coolant.

I don`t know what thermostat it has but it runs around 190-200* according to the factory gauge. The coolant was just done before i got it but it does have air in the system I think. I hear water flowing through it but the radiator and res. is full.

[schoolfire]

Heater core could be blocked? Its easy enough to check... I would disconnect it and try running water through it and see if its slow. If that isnt slowed I would check the lines running to/from radiator/engine and heater core.

Could also be the heater control valve if it had one.

[68c10owner]

Originally Posted by schoolfire

Heater core could be blocked? Its easy enough to check... I would disconnect it and try running water through it and see if its slow. If that isnt slowed I would check the lines running to/from radiator/engine and heater core.

Could also be the heater control valve if it had one.

I can hear water flowing through the core so I don`t think it`s blocked. I`ll look for a heater control valve. It does have a/c if that matters.

[schoolfire]

The control valve just limits the flow of water to the core. If there isnt a valve on the supply lines to open up I would still check for flow through the core... it just sounds like the core isnt ever getting hot enough to provide you with sweet warmth.

[68c10owner]

So how do I check it then? I have a/c so I can`t just unhook the hose.

[schoolfire]

Since I dont know hows yours is setup I took a picture of my trucks heater setup in hopes it might help. I dont know how much it is different but its pretty basic. I would disconnect your core supply lines at the engine and radiator to avoid hurting the core...


Hope that helps

Forgot to mention that the heater core never ties into the A/C... it just gets water from the engine and radiator.

[tvblazer78]

schoolfire, Thanks for taking the time to help out. good stuff.

[68c10owner]

Originally Posted by tvblazer78

schoolfire, Thanks for taking the time to help out. good stuff.

Yes thanks alot. Mine is a 90 but should be similar so i`ll check it out this afternoon when I get home. I forgot about the heat and a/c being seperate. for some reason I was thinking they were tied together but I remember my old 75 gmc was a a/c truck with the a/c stuff missing and the heater worked great. I`ll check the core for blockage. How hard are they to change? I`ve never done one that have the a/c box too. Are they any different? Thanks again.

[schoolfire]

They arent too terrible to replace... I had never done one before and I recently changed the one in the truck in the picture and it took me ~3 hours. I dont remember if the A/C stuff got in the way but I dont think its a big deal.

[68c10owner]

Well a little update. i let my wife drive it to work the other day and she said the heater worked just fine. I did find out it has a 180 thermostat but I`m thinkin I`m just not driving it far enough to get the temp up to where it blows hot. I do need to do something about the "flowing" sound still. I think I do need to adjust the cables because the defrost doesn`t blow on the windshield at all.

[tvblazer78]

Thanks for the update...