No heat - Ford Mustang Forum
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post #1 of 7 (permalink) Old 02-03-2019 Thread Starter
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No heat

We bought our son a 1999 six cylinder convertible and the heat does not work...

We listened to to many not mustang owners and have replaced the thermostat and the heater core.

I can watch the "heater door" move from C to H when I turn the knob from C to H so I think the door moves properly I can even hear a difference in the air flow when the knob is turn back and forth. but no change in temp

the fan motor changes to all speeds. The knob for the mode cycles through all the modes. the a/c is working

What else can I check.. Please any help is welcomed

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post #2 of 7 (permalink) Old 02-03-2019
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Welcome!

Check the coolant level first, and make sure that any excess air is purged out through the bleeder bolt above the t-stat housing. Once the cooling system is full, run the engine up to temp and feel if both heater core hoses are circulating hot coolant.


1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #3 of 7 (permalink) Old 02-03-2019
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Quote:
Originally Posted by garrisonjr84 View Post
We bought our son a 1999 six cylinder convertible and the heat does not work...

We listened to to many not mustang owners and have replaced the thermostat and the heater core.

I can watch the "heater door" move from C to H when I turn the knob from C to H so I think the door moves properly I can even hear a difference in the air flow when the knob is turn back and forth. but no change in temp

the fan motor changes to all speeds. The knob for the mode cycles through all the modes. the a/c is working

What else can I check.. Please any help is welcomed
Had a buddy bring his car into the shop after a very cold day, no heat... come to find out it was as simple as a thermostat, check the little things first before going into bigger, such as things that deal with the coolant. Good luck.
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post #4 of 7 (permalink) Old 02-03-2019 Thread Starter
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Thank You

Quote:
Originally Posted by Urambo Tauro View Post
Welcome!

Check the coolant level first, and make sure that any excess air is purged out through the bleeder bolt above the t-stat housing. Once the cooling system is full, run the engine up to temp and feel if both heater core hoses are circulating hot coolant.
This solved our issue heat is hot as can be

Thanks A lot
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post #5 of 7 (permalink) Old 02-03-2019
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Great! Keep an eye on it and make sure there aren't any leaks. Hopefully it was just an incomplete fill.

1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #6 of 7 (permalink) Old 02-08-2019
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It's great to see when people come here for a solution and they find one that works!

2008 Silver V6 Mustang Coupe
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post #7 of 7 (permalink) Old 02-08-2019
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Glad to hear you got the heat problem fixed. I was going to add that it'll help to put the top up. LOL. A lot of people forget that a thermostat that opens too soon will keep your heater from supplying enough heat to the car interior.
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