Is the AC condensate drain clogged?

Asked by Jul 30, 2015 at 04:28 PM about the 2011 Ford F-150 XLT SuperCrew

Question type: Maintenance & Repair

Hi There,

Please see attached photo showing AC condensate soaked the piece of foam and
dripping down onto passengers side floor from this box underneath the dashboard. What
is the cause and possible solution? Thanks.

10 Answers

39,915

It is either engine coolant, rain / carwash water or a/c condensate water. Put a little of it on your finger and taste it. If it is sweet it is engine coolant and the heater core or heater hose is leaking. If it doesn't taste sweet it is either a plugged a/c condensate drain or a leak around the cowl or windshield. Please note: when tasting, antifreeze is poisonous in larger quantities.

I am pretty sure without tasting it is the ac condensate because it is ice- cold and will only show the symptom after long hours driving with ac on. The myth is the ac condensate is also draining to the ground. Dealer said it is the evaporator core clogged and needs to be replaced. Any suggestion to clean the clog without replacing the core?

39,915

I would try to do some drain cleaning then. If you have good cold A/c airflow then the evaporator can't be too clogged. Also over-charged or slight under-charged a/c can cause the evap. to freeze and the water melt could be what is leaking.

Best Answer

So far I added a 90 degree elbow hose to the drain tube, which was just about less an inch coming out from the firewall and strong wind from cooling fans might have restrict the drainage. The drainage itself is seeming pretty good while vehicle is standing. Thanks.

39,915

Best of luck with it and please post a solution when you find it as it may help someone else.

Sure thing!

16,590

From the photo supplied it does not appear to be a leak so much as condensation is forming on the outside of the box every where. A leak would be more concentrated in one spot, this does not appear to be the case. Is there a outside humid warm air intrusion somewhere in the area? It does appear to be similar like if you place a glass of ice tea on a shady porch during the day the out of the glass will condense with water.

It does appear to be that way. But, the piece of foam on the box was soaked with water. So I suspect that water was back up inside the box with condensate.

But, I will check on if there is a leakage of outside air into cab. Thanks.

16,590

As Bob suggested being slightly low on refrigerant would cause ice to form on the evap. This could be the cause of the water when it melts. But is almost always results in a noticeable decrease in the temperature of the vent air. Easiest thing to do is to check the amount of refrigerant in the system to determine if it is low. You will need a set of gauges for this along with the spec guide on how to read the gauges as it relates to the ambient air temp when the test is performed.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Truck overheats when A/C is turned on. 3 answers

    I have a 1994 Ford F150, that starts overheating as soo. As i turn on the A/C, and goes back to normal when i turn it off. -The antifreeze looks prety clean in the radiator. -Replaced water pump Pl...

    1994 Ford F-150 XL Stepside SB

    -

    Maintenance & Repair

  • my heater does not work on my f150 but fan runs and ac works 2 answers

    2010 Ford F-150 XL

    -

    Maintenance & Repair

  • What to do about fuel problem on older ford (the has sat)? 2 answers

    I recently bought a 95 ford f150 351 with dual tanks that has been sitting for two years. I toggled back and forth on the pump switch over and the front tank showed to be empty so i filled it up with ...

    1995 Ford F-150 Eddie Bauer Extended Cab SB

    -

    Maintenance & Repair

  • why won't my truck start? 6 answers

    truck ran fine let it sit for 4 months now it tries to start but won't also replaced fuel pump

    1992 Ford F-150 S Extended Cab LB

    -

    Maintenance & Repair

  • 2015 Explorer AC Evaporator drain tube 1 answer

    I Have a 2015 Explorer XLT. Noticed a midewy smell as soon as i turn my AC on. Looked under the bidy and sure enough theres no condensation dripping out. Must be a clogged evaporator drain whitch is...

    2015 Ford Explorer XLT 4WD

    -

    Maintenance & Repair

F-150

Looking for a Used F-150 in your area?

CarGurus has 212,354 nationwide F-150 listings starting at $1,000.

ZIP:

Search Ford F-150 Questions

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,920
#2 dandyoun
dandyoun
Reputation 4,180
#3 tennisshoes
tennisshoes
Reputation 2,510
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,286 Great Deals out of 155,167 listings starting at $1,395
Used GMC Sierra 1500
935 Great Deals out of 62,272 listings starting at $1,395
Used Dodge Ram 1500
530 Great Deals out of 12,833 listings starting at $1,995
Used Ford F-250 Super Duty
396 Great Deals out of 45,084 listings starting at $2,000
Used Toyota Tundra
584 Great Deals out of 30,719 listings starting at $2,637
Used Toyota Tacoma
619 Great Deals out of 35,131 listings starting at $2,155
Used Ram 1500
1,200 Great Deals out of 115,437 listings starting at $6,995
Used Ford Mustang
361 Great Deals out of 44,495 listings starting at $1,000
Used Nissan Titan
222 Great Deals out of 16,972 listings starting at $3,999
Used Ford Explorer
937 Great Deals out of 74,004 listings starting at $750
Used Chevrolet Tahoe
776 Great Deals out of 28,447 listings starting at $1,500
Used Chevrolet Colorado
264 Great Deals out of 19,422 listings starting at $1,995
Used Ford Ranger
204 Great Deals out of 6,719 listings starting at $1,450
Used Jeep Wrangler
392 Great Deals out of 19,082 listings starting at $3,000

Used Cars For Sale

2017 Ford F-150 XLT SuperCrew For Sale
6,043 listings starting at $28,715
2016 Ford F-150 XLT SuperCrew For Sale
29 Great Deals out of 3,062 listings starting at $21,495
2015 Ford F-150 XLT SuperCrew For Sale
28 Great Deals out of 566 listings starting at $21,962
2014 Ford F-150 XLT SuperCrew For Sale
24 Great Deals out of 606 listings starting at $16,995