Heater

200

Asked by Jan 03, 2016 at 05:57 PM about the 1992 Ford F-150 S 4WD LB

Question type: Maintenance & Repair

Heater doesn't heat, also in warmer weather it
overheats at times. Thinking  thermostat,  and
possible heater core.

3 Answers

155

Sounds like youre on the right track with the thermostat and heater core. First, Id check to see if you have air in the system. Air creates a barrier that the fluid cannot travel past and in turn, not travel to the heater core. Are you low on coolant? Is it leaking coolant? Is coolant level dropping but no visible leak? If yes to the latter, it could be a possible head gasket failure (you may see white smoke coming from exhaust pipes), but I would start with the easy stuff, like the thermostat and checking for air in the system.

200

I just checked fluid / coolant. It's was good, but there was a brown sludge looking stuff under the cap.

155

Could be oil. Was there a lot or a little? The oil system is pressurized at a maximum of 100ish psi (when cold..goes down when warm) and the cooling system is about 16psi max. If the head gasket is compromised, the leak will take the path of least resistance whether its into the cylinders, into the oil system, into the cooling system, or leaking outside the block. IF you have a chance, find a shop with a coolant pH test to verify if you are bleeding compression into the cooling system. These tests aren't fool proof but are a good starting point. Another place oil can leak into the cooling jackets is the front timing cover. Any visible leaks around there?

Your Answer

Add photo

Related Questions

  • Heater 2 answers

    My heater in my truck only blows out cool/cold air. Is there something I can check or try before taking to the shop?

    2011 Ford F-150 Lariat SuperCrew 4WD

    -

    Maintenance & Repair

  • Heater 3 answers

    Heater doesn't heat, also in warmer weather it overheats at times. Thinking thermostat, and possible heater core.

    1992 Ford F-150 S 4WD LB

    -

    Maintenance & Repair

  • heater 3 answers

    What would make ur heater quit for a few days then start working again for a few days then stop again.

    2009 Ford F-150 FX4 SuperCab 4WD

    -

    Maintenance & Repair

  • Heater/aircond. blower motor

    my heater air condition blower motor only works on low speed & has a horrible growling noise, I replaced the resistor as recommended by ford dealer didn't help. Pulled motor out plugged into power r...

    2010 Ford F-150 Platinum SuperCrew 4WD

    -

    Maintenance & Repair

  • heater & air conditioner not working 3 answers

    both a/c and heater not working.

    2006 Ford F-150 Lariat SuperCrew

    -

    Maintenance & Repair

F-150

Looking for a Used F-150 in your area?

CarGurus has 207,336 nationwide F-150 listings starting at $1,499.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 8,160
#2 dandyoun
dandyoun
Reputation 4,390
#3 tennisshoes
tennisshoes
Reputation 2,860
View All

Related Models For Sale

Used GMC Sierra 1500
761 Great Deals out of 69,125 listings starting at $1,850
Used Ford Mustang
541 Great Deals out of 45,846 listings starting at $1,999
Used Ford F-250
469 listings starting at $2,000
Used Ford Explorer
928 Great Deals out of 70,251 listings starting at $997
Used Ford Ranger
176 Great Deals out of 5,676 listings starting at $950

Used Cars For Sale

2018 Ford F-150 For Sale
51 listings starting at $35,135
2017 Ford F-150 For Sale
26 Great Deals out of 133,535 listings starting at $18,022
2016 Ford F-150 For Sale
88 Great Deals out of 13,559 listings starting at $18,300
2015 Ford F-150 For Sale
204 Great Deals out of 8,344 listings starting at $16,999
2014 Ford F-150 For Sale
385 Great Deals out of 12,684 listings starting at $6,600

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.