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Old 12-12-2011, 09:12 AM   #1
dubesinhower
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svt focus heat doesn't work

hey everybody!

i noticed a few weeks ago that the gauge all the way to the right in the svt cluster (i think it's oil temp? or oil pressure) keeps going all the way up, and then back to normal (in the middle). then, yesterday i was driving to my friends house (which is an hour away), and noticed that my heat doesn't work! i had the blower on all the way, and the heat on all the way, and cold air was blowing out.

i tried turning the blower off to see if the air coming out of the vents got hot, and it does. but as soon as i turn the blower on, the air quickly gets cold.

anybody have any thoughts?


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Old 12-12-2011, 09:36 PM   #2
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Low coolant?
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Old 12-12-2011, 10:13 PM   #3
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Cranking the heat up on a vehicle (at operating temperature) and only getting cold air is a symptom of of a damaged head gasket. The coolant ports have a compromise in the system (gaskets), and without a proper seal, it can't maintain the proper temperature in the engine or the cabin.
Passenger compartment heat uses the heat that radiates from warm/hot coolant and a blower motor to direct that heated air into and through the vents... if it was a faulty blower assembly the system wouldn't crank up to high (without noises or other symptoms). That's what I'm thinking anyways; I'll ask about that tomorrow at school/work.
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Old 12-12-2011, 10:17 PM   #4
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Quote:
Originally Posted by 69Hcode View Post
Low coolant?
I'll also see about a low coolant situation, it stands to reason that if there wasn't enough coolant to begin with, and assuming you're not leaking it somewhere, that in off or low fan speeds you may feel it, but not when demand for higher temperatures is called for.

If that's the case, how would you have run low on coolant, it's a sealed system so it's not like it would just evaporate?!
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Old 12-13-2011, 04:45 AM   #5
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Check coolant level first.
Put odometer in test mode and watch temps to verify t-stat is working correctly.
If those two check out, I would guess your heater core is probably needs a good flush as mine did.
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Old 12-13-2011, 06:53 AM   #6
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Blockages or air bubbles may do it too...
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Old 12-13-2011, 08:54 AM   #7
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I know people look over this alot of times but it happened to me after I rebuilt my motor in my SVT. I wasnt getting ANY heat, the car did get to operating temp very funny. I too thought it was my heater core or that I had a air pocket somewhere, but it was my oil cooler that was plugged up
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Old 12-13-2011, 03:43 PM   #8
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I helped a friend at school with the same type of issue, he had an obstruction of some kind in the system. We took the cap off the overflow tank, and as we did the coolant started spitting coolant out the overflow tube. Air was hissing out as he took the cap off. Got it on the lift and found a ruptured hose, too.

Would a coolant flush dislodge something like that? Yet another question!
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