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Heat problem
- Thread starter Cobrajay
- Start date
- Location
- Maurertown,Va.
You have a vacuum line unhooked,check to see if the heat is coming out of the de-froster vents.
Wayne
Wayne
Yea, it comes out of the de-froster and all the other vents however, if I have the vents in front (over the radio) it will work fine but then make a weird noise and nothing will come out. If I switch it off and then back on, it will work and sometimes not work. Weird...
GrimmJeeper
NAXJA Forum User
- Location
- Gardena, CA
all of the heater controls are vacuum operated. it sounds like you have a vacuum leak somewhere.
- Location
- Southern Maryland
if it's blowing at the same strength but coming out cold you either have a problem with the blend door or an air pocket in the coolant
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
Always post the year/engine of your XJ for most accurate results.
Older XJs were notorious for holding an air pocket after cooling system work, newer ones are generally self bleeding.
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
Or sticking tstat. Most often this is reported to be fixed by new tstat. Even if the offender is a new tstat. Try Stant Premium version.
- Location
- Pekin IN/Louisville KY area
It certainly could be an air bubble. However, it may be something simpler. It may just be the really cold weather. Here's my theory based on personal experience/observation. When a really cold engine is getting warmed up the antifreeze will get up to temp, the t-stat will open, and the super cold antifreeze in the radiator will dump into the engine causing the t-stat to close again. This can cause fluctuations in the temp readings until the engine & radiator are fully up to temp. In really cold weather like we're having right now this cycle may continue for a long time.
just my .o2, DougN
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