Thermostat went out last Sunday. What is causing this.

Asked by snappy98 Jan 17, 2016 at 08:19 PM about the 1999 Ford Explorer 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

My thermostat went out last Sunday. I put in a new one on Monday and
everything was great until I went out to warm up my vehicle this morning. As
soon as it got warm the temp gauge spiked again.  The heater was blowing
out cold air.  What is causing this.

3 Answers

snappy98 answered 9 years ago

yes. I installed the new one identical to the one I took out. I am wondering if I should have went ahead and changed the coolant temp sensor also.

Mark helpful
74,750

OJ answered 9 years ago

Is the coolant old. If a 50/50 mixture is not maintained it will overheat. Get the engine up to operating temp and feel both lines leading to and from the heater core. If one is hot and the other cold, there is a blockage in the core.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Thermostat went out last Sunday. What is causing this. 3 Answers

    My thermostat went out last Sunday. I put in a new one on Monday and everything was great until I went out to warm up my vehicle this morning. As soon as it got warm the temp gauge spiked again. Th...

    1999 Ford Explorer 4 Dr XLT 4WD SUV

    -

    Maintenance & Repair

  • What is this spring? 5 Answers

    I am embarrassed to ask this, but here goes. We recently replaced the alternator in our 1997 Ford Explorer. When we took the alternator out, we found this spring (see photo). It was just loose in th...

    1997 Ford Explorer 4 Dr XLT SUV

    -

    Maintenance & Repair

  • What is this loud fast knocking? 1 Answer

    I have had no previous problems with my truck, drove it yesterday, with no issues. I get in this morning to take my daughter to McD's, go to start the truck, only to be caught off guard by a loud, ...

    2002 Ford Explorer XLT 4WD

    -

    Maintenance & Repair

  • What can be causing the vehicle to not start? 4 Answers

    I have a Ford Explore 2000 6 Cylinder 4.0L. It overheated and engine shut off before I could get it safely off the highway. The Heater Control valve cracked. I replaced it. The engine will turn over b...

    2000 Ford Explorer XLS 4WD

    -

    Maintenance & Repair

  • why is my 05 Explorer overheating after I changed the thermostat 1 Answer

    Hi guys I have a 2005 Ford explore about a week ago it started overheating so I changed out the thermostat ending up there was a hole in the thermostat housing so I change that as well and now my ...

    2005 Ford Explorer XLT V6

    -

    Maintenance & Repair

Explorer

Looking for a Used Explorer in your area?

CarGurus has 51,562 nationwide Explorer listings starting at $1,899.

ZIP:

Own this car?

Share your experience with others.

1999 Ford Explorer

Write a car review

Review another car

Shortcuts

Search Ford Explorer Questions

CarGurus Experts

  • #1
    OJ
    Reputation
    31,210
  • #2
    TransAm77
    Reputation
    7,910
  • #3
    Gene Arnett
    Reputation
    7,380
View All

Know more, shop wisely

Search

Related Models For Sale

Used Ford Expedition
1,010 Great Deals out of 21,856 listings starting at $2,950
Used Ford F-150
6,803 Great Deals out of 166,301 listings starting at $2,000
Used Chevrolet Tahoe
1,384 Great Deals out of 23,148 listings starting at $2,995
Used Jeep Grand Cherokee
2,508 Great Deals out of 50,372 listings starting at $995
Used Dodge Durango
914 Great Deals out of 17,930 listings starting at $2,995
Used Toyota 4Runner
1,430 Great Deals out of 19,193 listings starting at $3,295
Used Chevrolet Silverado 1500
4,784 Great Deals out of 115,573 listings starting at $2,995

Used Cars for Sale

2025 Ford Explorer For Sale
81 Great Deals out of 25,435 listings starting at $31,229
2024 Ford Explorer For Sale
86 Great Deals out of 1,409 listings starting at $28,797
2023 Ford Explorer For Sale
402 Great Deals out of 4,190 listings starting at $17,500
2022 Ford Explorer For Sale
445 Great Deals out of 5,270 listings starting at $16,782
2021 Ford Explorer For Sale
264 Great Deals out of 2,792 listings starting at $12,500

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. Content will be removed if CarGurus becomes aware that it violates our policies.