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Joined: Jun 2004
Posts: 1,781
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From: Central NY
There are a couple of things that I think may apply, I recall reading that *things* like to fall down the defrosters and physically block the blend door and There something about a fresh-air vent not closing, like turning air to max should close it. I don't think its calld the fresh air vent though and I can't think of the technical name. I hope i'm getting the idea across.
Good luck!
Popa Tim
Good luck!
Popa Tim
Freshman User
Joined: Aug 2005
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Originally Posted by Bunka
I would expect the heater line measured on the outside of a rubber hose to be less than the "inside" water temp. Even a radiator surface measures approx 5 to 10* less than the inside temp and aluminum transfers heat a lot better than rubber. This I do know.
Both heater core lines are the same, therefore the water is circulating.
The A/C being on should not affect the heater temperature IF the blend door is closed all the way.
John
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New User
Joined: Nov 2004
Posts: 21
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Originally Posted by Popa Tim
There are a couple of things that I think may apply, I recall reading that *things* like to fall down the defrosters and physically block the blend door and There something about a fresh-air vent not closing, like turning air to max should close it. I don't think its calld the fresh air vent though and I can't think of the technical name. I hope i'm getting the idea across.
Good luck!
Popa Tim
Good luck!
Popa Tim
Junior User
Joined: Sep 2005
Posts: 75
Likes: 0
From: Fort Rock, OR
I'm working on the same problem, I did find the "fresh air door". If you lay your head on the passenger floorboard and look past the bottom right side of the heater core housing you should see a plastic grate with 1" square openings, overall approx 4" x 6".
If you remove the blower fan from the engine compartment you can also see the door.
If open it allows the blower fan to pull outside air from the passenger side fender.
Is the blend door located directly to the left of heater core.
FYI my truck is 1994 F150
If you remove the blower fan from the engine compartment you can also see the door.
If open it allows the blower fan to pull outside air from the passenger side fender.
Is the blend door located directly to the left of heater core.
FYI my truck is 1994 F150
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New User
Joined: Nov 2004
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Originally Posted by harris2108
I'm working on the same problem, I did find the "fresh air door". If you lay your head on the passenger floorboard and look past the bottom right side of the heater core housing you should see a plastic grate with 1" square openings, overall approx 4" x 6".
If you remove the blower fan from the engine compartment you can also see the door.
If open it allows the blower fan to pull outside air from the passenger side fender.
Is the blend door located directly to the left of heater core.
FYI my truck is 1994 F150
If you remove the blower fan from the engine compartment you can also see the door.
If open it allows the blower fan to pull outside air from the passenger side fender.
Is the blend door located directly to the left of heater core.
FYI my truck is 1994 F150
New User
Joined: Sep 2005
Posts: 12
Likes: 0
From: High on a hill!
check it?
All you have to do to check it is turn it on and go inside for awhile..without the forced incoming air you will be getting heat versus driving with forced fresh air mixing with the heat. If you are not getting a movement sound (clunk) whenever shifting between heat/defrost and AC, then your problem is somewhere in the temperature mechanism or the door is not closing fully.
Junior User
Joined: Mar 2004
Posts: 54
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From: Farmington, Iowa
I have the same problem with my truck. I hav a 1989 F-150 with and Inline 6 and b4 I had heat but not real hot so I replaced the thermostat. then I had no heat so I replaced the heater core and still no heat , flushed the system and changed the cap and also the coolant temp censor Still No Heat. BUNKA I am with you I have also freeezing my *&%$#* Off! I am going to try and swap the hoses today and see if that works! (Fingers Crossed)
New User
Joined: Sep 2005
Posts: 7
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backward heater hoses
just letting you know, i have a 92 f150 with a 302. had a similar problem. no heat. switched the hoses after realizing i could have made a mistake putting new hoses on it this summer. since the switch i think i could cook a turkey in the cab
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Joined: Jan 2004
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From: Valley City North Dakota
waterpump flow
Hey guys,
I don't know if this ever got fixed or not. I had a problem last winter with very little heat. Changed T-stat still nothing. Waterpump finally let go, so i put in a new one. that fixed it!!!! apparently my pump wasn't moving enough water to do any good.
give that a test.
micheal
I don't know if this ever got fixed or not. I had a problem last winter with very little heat. Changed T-stat still nothing. Waterpump finally let go, so i put in a new one. that fixed it!!!! apparently my pump wasn't moving enough water to do any good.
give that a test.
micheal
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