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Low heat inside cab

Customer Question
Low heat inside cab
Submitted: 6 months ago.Category: Ford
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Answered in 1 minute by:
1/3/2018
Ford Mechanic: Jeremy, Certified Diesel Technician/Electrician replied 6 months ago
Jeremy
Jeremy, Certified Diesel Technician/Electrician
Category: Ford
Satisfied Customers: 3,777
Experience: ASE, NATEF Engines and Electrical certified, EPA 608/609
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My name is ***** ***** I will assist you with your question today.

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We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!

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Customer reply replied 6 months ago
2002 Ford F150 Crew 4.8l engine. Little to no heat inside cab at idle. Engine temp is normal.
Ford Mechanic: roy, import/domestic specialest replied 6 months ago
roy
roy, import/domestic specialest
Category: Ford
Satisfied Customers: 7,721
Experience: ASE master tech for 40 years
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do you still nee help??

Roy

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Ford Mechanic: roy, import/domestic specialest replied 6 months ago

ok

when the truck is hot are both hoses going into the truck from the outside hot??

when you move the control from hot to cold and back, can you hear the mode door move??

Roy

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Customer reply replied 6 months ago
Let me start by telling you what I have done. I have replaced the heater core, the radiator, the belt, the heater hoses, the actuator door, and the actuator. I have 120 degrees blowing from the vent at idle, will go up to 140 driving. Both hoses are hot, inlet hotter than outlet.
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

ok, the post was not clear. thank you

did you bleed the system?? other than that it looks like a circulation issue such as the water pump no pushing enough coolant through the heater core

Roy

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Ford Mechanic: roy, import/domestic specialest replied 6 months ago

has it ever overheated??

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Customer reply replied 6 months ago
Have bled the system by filling and burping, unless there is a procedure to bleeding this engine I am unaware of?? Please say there is
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

the way I bleed them is this way. I remove the radiator cap run the engine at 1200 rpm for 5 minutes watching the coolant level and topping off as needed. install the cap and then drop to idle.

Roy

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Customer reply replied 6 months ago
Same here. Thats the way I do it. Any other ideas?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

ok if both hoses are hot, the mode door is working it only leaves the core. I know it is new but if some debris got into the new core from the cooling system it could clog it up.

Roy

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Customer reply replied 6 months ago
Checked it earlier today, has great flow
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

it is the only thing left unless you have an issue inside the case. the fact you have good heat driving along says there is no issue inside.

Wish I was there to help you with this one

Roy

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Customer reply replied 6 months ago
Technically it should blow hotter than 140 driving with it having a 190 degree thermostat, shouldn't it?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

135-150 is average. it will not blow 160 and above.

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Customer reply replied 6 months ago
what should it be at idle?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

no more than 10 degrees difference from running down the road

Roy

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Customer reply replied 6 months ago
should have 140 at idle?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

what is the temp of the air running down the road?? you stated 140 so it should be around 130

Roy

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Customer reply replied 6 months ago
Seems low to me, but let's get it to 130. How do we do that?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

I am here and not there. check all he seals around the case and the outside vents to be sure there are no leaks.

Roy

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Customer reply replied 6 months ago
I checked the evap case when installing the heater core, and all duct work was together and lined up while the dash was out. I see no obvious leaks in the air flow. I realize you are there, and I am here, but I thought the purpose of me paying you was for you to help me, thus WE, fixing this issue. Is that not the case?
Ford Mechanic: roy, import/domestic specialest replied 6 months ago

not without me seeing this case.

you have not paid me anything. you paid the site. I only get paid when you accept my answers

I will opt out and see if anyone else has any better ideas

you have a great night

Roy

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Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
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Experience: 16 years experience
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Welcome, I'm Chris (aka-Moose).

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I see you opted out the other tech.

Can I try to help?

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Customer reply replied 6 months ago
Please do
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

2 experts into this and no resolve, so I am just going to start over.

2002 Ford F150 Crew 4.8l engine. Little to no heat inside cab at idle. Engine temp is normal.

Engine running at operating temp, heat on hot, blower on high.

Grab the upper radiator hose, it should feel like 180-200 degrees. Now grab both heater core hoses at the firewall do they feel around 160-180?

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Customer reply replied 6 months ago
They are both hot, one a little hotter than the other. Heater core, radiator(was leaking), water pump, thermostat, heater blend door, actuator have all been replaced. Heat at idle in 60 degree garage gets 100-110 at normal operating temp. Have seen as high as 120. Rev it to about 2000 rpm and hold and temp will rise to 160
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

I knew where we need to look next until your last sentence "Rev it to about 2000 rpm and hold and temp will rise to 160"

At idle guesstimate the temp on heater hose 1 and 2. Hold it at 2000 rpms and give me the temps hose 1 and 2 now

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Customer reply replied 6 months ago
Let me warm it up and I will hit it with a laser
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

That will be great.

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Customer reply replied 6 months ago
At idle Hose 1 105
Hose 2 116
At 2000 RPM Hose 1 148
Hose 2 142
Customer reply replied 6 months ago
The hose numbers are switched, but you get the idea
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Thanks, ***** ***** way to cold. For reference, what is the temp on the upper radiator hose near the thermostat?

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Customer reply replied 6 months ago
148
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

That is too cold as well. Can you test your temp gun to something you know is accurate? Like a glass of ice water 32. Something inside your house around 72 degrees assuming that is the temp?

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Customer reply replied 6 months ago
I checked it against my pyrometer gauge and it is within 2 degrees
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Thanks, ***** ***** needs to be under the hood in this case. You should have gotten the hose temps like I mentioned prior and your 30-60 degrees colder than those. Your thermostat is either stuck open or the water pump impeller is worn out and not moving enough coolant. I would start with a thermostat replacement first. You mentioned the heater core flushed well, so we should not need to check there for a restriction. Also, make sure your fan clutch is not locked up and cooling to much.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5-star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

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Customer reply replied 6 months ago
The water pump is brand new. The customer brought it to me saying local Ford garage had just replaced the thermostat, problem was there before that.
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Something is making this engine not circulate enough coolant to get heat to the heater core or the coolant is flowing freely and not stopping in the engine to get hot enough from a thermostat concern. The concern is not inside the dash. I would remove the thermostat and check there.

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Customer reply replied 6 months ago
I replaced the thermostat after you suggesting this, and for about an hour I had heat, then it dropped off worse than it was previously. Any ideas? Seems to me it must be in that area for that to act that way?
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Remove the thermostat and the lower radiator hose and heater hoses. Flush the radiator, core, and engine with a hose forward and backward. Do this many times till its clean. Then reassemble everything and refill with coolant, it will need to be a stronger being there is residual water in the engine. I am thinking someone has put stop leak in it and its getting stuck in the thermostat and causing it to stick open.

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Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Hello, Chris here again,

I am checking in to make sure you got everything you expected from my answer. The option to rate my response or reply is still available. I want to make sure you were pleased with what you paid for.

Thanks Chris

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Customer reply replied 6 months ago
I flushed the entire system, removed all the hoses, flushed both ways, until clear water came out, then filled with anti-freeze, same problem. I did find that if I warm the engine inside the garage, I get 140 degrees, but if I start it outside I do good to get 120, sometimes it stays at 80, engine running normal temp on scanner and dash. When starting outside, the engine doesn't even want to get full temp outside on its own. Any suggestions?
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

What parts have been replaced so far?

We need to hurry up because this post will time out tomorrow from not being rated. I do not want you to feel like I am not responding because I can no longer see the post.

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Customer reply replied 6 months ago
Have replaced:
Radiator
Water Pump
Thermostat
Heater Core
Heater Hoses
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Since your engine is not getting to operating temp, it has to be freezing cold outside or your fan is stuck on and cooling the radiator and engine to much. As long as all those parts are good and installed right. You have to get the engine to operating temp around 190-200 before you can get the heater core hotter.

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Customer reply replied 6 months ago
Engine can run for 30 minutes and not be up to temp.. I have stopped the clutch fan so it couldn't cool the engine.
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Maybe your thermostat is wrong or upside down.

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Customer reply replied 6 months ago
Changed it twice, definitely not upside down. I'm at a loss,
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

The last thing I can think of is to install a hotter running thermostat.

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Customer reply replied 6 months ago
Possible head gasket?
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

That would cause overheating and coolant loss.

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Customer reply replied 6 months ago
No solution at this point?
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

You have to overlooking something we have covered to have a concern with the engine running too cold. An engine will run too cold from a fan or thermostat issue or it is extremely cold outside. Did you install a hotter thermostat yet?

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Customer reply replied 6 months ago
I have installed the hottest thermostat I can get, 192. Like I said before, the engine shows it is running normal temp by the scanner and dash gauge, just not putting the heat out. It is about 10 degrees here, but that shouldn't keep it from producing heat. It comes and goes at times, makes no sense.
Ford Mechanic: Chris (aka- Moose), Technician replied 6 months ago

While running in park at operating temp your upper radiator hose should be about 190 degrees. Do you get that result?

If not if you use a stick to hold the throttle at 2000 rpms, does the hose then remain that temp?

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