Heater goes cold unpredictably.

Asked by Jan 04, 2016 at 03:51 PM about the 2005 Toyota Tacoma 4 Dr STD 4WD Extended Cab SB

Question type: Maintenance & Repair

My heater goes cold unpredictably but possibly
more often when idling. The temperature gauge is
normal. What's the problem? Is it fixable by me, a
fairly capable amateur?

3 Answers

11,170

Most likely just low on antifreeze. You may need to flush the system, especially the heater core. If you are handy, its not to hard. Plenty of videos on youtube . Try just adding some coolant to the reservoir tank first though. There should be full hot and full cold marks on the tank to help get the correct level. If you are a bit low, watch it for a while afterward to make sure you aren't losing it regularly, could mean more problems.

2 of 2 people found this helpful.
93,045

Of course the first thing to check is the coolant level cold, also check for oil int the coolant and coolant in the oil, if those check OK then you may want to check the cooling systems ability to hold pressure, if the water pump is the least bit weak or leaking it may not be able to deliver a good flow to the heater core, next check the heater hoses, make sure they are not collapsing while running at full operational temps. the only other thing I can think of is a restricted heater core, so when the water flow slows down like at an idle it doesn't have enough flow to sustain good heated air flow. HTH

Thanks! I'll check the level.

Your Answer

Add photo

Related Questions

  • How long will 1994 last with a 146,600 mmiles on it 6 answers

    1995 Toyota Tacoma 2 Dr V6 4WD Standard Cab SB

    -

    General

  • Check Engine Light 2 answers

    I have a 1985 MR2 MK1. For the entire time I have owned the car (more than 30 years), the check engine light will come on occasionally and unpredictably. Sometimes after I have driven the car for a ...

    1985 Toyota MR2

    -

    Maintenance & Repair

  • 2014 Avalon Ltd won't start 5 answers

    My 2014 Avalon Ltd. is two weeks old, this morning it wouldn't start....just clicking ......Toyota sent a tow truck, boosted it and it started right away. Toyota tested the battery...said it tested ...

    2014 Toyota Avalon Limited

    -

    Maintenance & Repair

  • VSC Icon Alarm Comes on When Turning on dry roads 1 answer

    We have a 2006 Toyota Sienna. The vehicle has 188,000 miles on it. The VSC icon comes on along with the alarm when driving on dry roads and when turning whether on flat or downhill travel with the bra...

    2006 Toyota Sienna LE AWD

    -

    Maintenance & Repair

  • Problems starting 2005 Toyota Camry XLE 4 answers

    I am having trouble starting my Camry, and the very same thing happened about a year ago. Back then, despite having it in the shop multiple times, and sometimes leaving it with them for days, the ca...

    Toyota Camry

    -

    Maintenance & Repair

Tacoma

Looking for a Used Tacoma in your area?

CarGurus has 40,814 nationwide Tacoma listings starting at $2,495.

ZIP:

Search Toyota Tacoma Questions

Toyota Tacoma Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,010
#2 genxer36
genxer36
Reputation 330
#3 TarsTarkas
TarsTarkas
Reputation 310
View All

Related Models For Sale

Used Toyota Tundra
444 Great Deals out of 34,312 listings starting at $2,700
Used Ford F-150
2,195 Great Deals out of 206,316 listings starting at $1,499
Used Nissan Frontier
304 Great Deals out of 25,149 listings starting at $1,995
Used Chevrolet Silverado 1500
1,716 Great Deals out of 175,751 listings starting at $1,250
Used Toyota 4Runner
252 Great Deals out of 20,494 listings starting at $1,800
Used Chevrolet Colorado
217 Great Deals out of 24,313 listings starting at $2,495
Used GMC Sierra 1500
825 Great Deals out of 68,199 listings starting at $2,484
Used Ford Ranger
197 Great Deals out of 5,805 listings starting at $1,650
Used Jeep Wrangler
277 Great Deals out of 18,163 listings starting at $2,950
Used Dodge Ram 1500
453 Great Deals out of 11,152 listings starting at $700
Used GMC Canyon
92 Great Deals out of 9,387 listings starting at $2,495
Used Nissan Titan
170 Great Deals out of 19,555 listings starting at $3,000
Used Toyota Camry
999 Great Deals out of 90,916 listings starting at $650

Used Cars For Sale

2017 Toyota Tacoma For Sale
18 Great Deals out of 23,427 listings starting at $14,995
2016 Toyota Tacoma For Sale
76 Great Deals out of 2,637 listings starting at $20,990
2015 Toyota Tacoma For Sale
86 Great Deals out of 2,951 listings starting at $15,984
2014 Toyota Tacoma For Sale
41 Great Deals out of 1,992 listings starting at $8,995
2013 Toyota Tacoma For Sale
40 Great Deals out of 2,001 listings starting at $8,995

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.