Coolant pressure is high after I shut engine off.

Asked by Jul 07, 2013 at 04:05 PM about the 2003 Lincoln LS V8 Premium Sport

Question type: Maintenance & Repair

I have a 2003 LS V8 and just replaced thermostat housing, thermostat and coolant resevoir. The temp guage is right where it is supposed to be but when I shut engine off, there is high pressure in the system and if I dont bleed it out it leaks coolant. Also, it appears to boiling in the resevoir. What is causing this? I checked oil and it is clean in case the head gasket was blown and leaking coolant into the oil.

3 Answers

240

the high pressure in the system is normal (15psi), replace the reservoir cap and check again.

24,635

Agreed. I forget the formula but for every pound of pressure the system has, it raises the boiling point of the coolant. 15psi raises the boiling point considerable and NEVER open a cap that has pressure on it - I have the scars to prove it! The coolant instantly boils as soon as the pressure is relieved and you and everything around you can be coated in this 212+ degree substance that is slicker than snot and doesn't come right off - unless your skin is going with it. Sorry. Replace the cap and check for leaks. Use the proper antifreeze and mixture (usually 50/50).

15

My car is doing the same thing Ive replaces the coolant reservoir 3 times the climate control module 2 times and replaced the t hose and thermostate and housing. no water in the oil, not burning and it runs fine in fact to good for 164000 miles. Im doing a C02 check today why else would the system be vapor locking. My climate control module works fine than all of a sudden it blows out cold air than next extremely hot air. Scared to say no tranny issues yet but that could pop up today.!

Your Answer

Add photo

Related Questions

LS

Looking for a Used LS in your area?

CarGurus has 489 nationwide LS listings starting at $2,195.

ZIP:

Search Lincoln LS Questions

Lincoln LS Experts

#1 Ionatan Ion
Ionatan Ion
Reputation 1,220
#2 Tom Demyan
Tom Demyan
Reputation 890
#3 Jonathon Sheffield
Jonathon Sheffield
Reputation 740
View All

Related Models For Sale

Used Lincoln Town Car
34 Great Deals out of 1,791 listings starting at $1,500
Used Cadillac CTS
183 Great Deals out of 10,513 listings starting at $1,500
Used Chevrolet Impala
591 Great Deals out of 34,068 listings starting at $899
Used Honda Accord
948 Great Deals out of 77,757 listings starting at $899
Used Ford Mustang
541 Great Deals out of 45,846 listings starting at $1,999
Used Lincoln Navigator
103 Great Deals out of 5,837 listings starting at $1,900
Used Lincoln Continental
6 Great Deals out of 5,051 listings starting at $37,988
Used BMW 3 Series
945 Great Deals out of 30,262 listings starting at $1,000
Used Nissan Maxima
321 Great Deals out of 24,382 listings starting at $999
Used Ford F-150
2,055 Great Deals out of 207,336 listings starting at $1,499

Used Cars For Sale

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.