# 1999 no heat till driving **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chrysler, heating\ **Created:** [November 23, 2009, 2:51pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900 "2009-11-23T14:51:41Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![garypup](https://avatars.discourse-cdn.com/v4/letter/g/9d8465/32.png) [@garypup](https://community.cartalk.com/u/garypup)\ **Post date:** [November 23, 2009, 2:51pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/1 "2009-11-23T14:51:41Z")
blower works how come no heat while at idle? ---
**Author:** ![americar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/americar/32/42_2.png) [@americar](https://community.cartalk.com/u/americar)\ **Post date:** [November 23, 2009, 3:05pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/2 "2009-11-23T15:05:17Z")
No heat at idle usually indicates low coolant ---
**Author:** ![garypup](https://avatars.discourse-cdn.com/v4/letter/g/9d8465/32.png) [@garypup](https://community.cartalk.com/u/garypup)\ **Post date:** [November 23, 2009, 3:29pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/3 "2009-11-23T15:29:06Z")
i already topped off coolant ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [November 23, 2009, 3:49pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/4 "2009-11-23T15:49:32Z")
Did you make sure to bleed all the air out of the cooling system after topped off the radiator? ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [November 23, 2009, 5:43pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/5 "2009-11-23T17:43:13Z")
Air block in the system or maybe a water pump going out. ---
**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\ **Post date:** [November 23, 2009, 6:32pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/6 "2009-11-23T18:32:33Z")
It’s been my experience that when a water pump goes out it leaks. ---
**Author:** ![Bladecutter](https://avatars.discourse-cdn.com/v4/letter/b/aeb1de/32.png) [@Bladecutter](https://community.cartalk.com/u/Bladecutter)\ **Post date:** [November 24, 2009, 12:06am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/7 "2009-11-24T00:06:32Z")
Your experience hasn’t included all modes of water pump failure. They can fail without creating a leak. BC. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [November 24, 2009, 12:17am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/8 "2009-11-24T00:17:32Z")
No heat could also be a stuck open thermostat. The radiator is removing more heat that the engine is generating at idle, and the thermostat, which is supposed to regulate the temperature of the engine is not doing it at all. The engine is too cool, costing you fuel and heat for the heater. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [November 24, 2009, 12:21am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/9 "2009-11-24T00:21:25Z")
There’s probably air in the cooling system and when the water pump slows down it collects in the heater core. To purge all the air out of the cooling system, get the engine up to operating temperature. With the engine idling, slightly loosen the upper radiator hose clamp. Take a small flat bladed screwdriver and insert it between the upper radiator hose and the radiator hose neck. Allow the engine to idle until all the air is purged from the cooling system. Remove the screwdriver and retighten the hose clamp. Tester ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [November 24, 2009, 2:24am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/10 "2009-11-24T02:24:00Z")
I concurr! ---
**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\ **Post date:** [November 24, 2009, 2:28am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/11 "2009-11-24T02:28:45Z")
Bladecutter, just how does a pump fail, does the impeller wear down? I don’t think so. ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [November 24, 2009, 12:25pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/12 "2009-11-24T12:25:47Z")
just how does a pump fail, does the impeller wear down? I don’t think so. You have not looked inside a newer plastic impeller water pump. ---
**Author:** ![EllyEllis](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@EllyEllis](https://community.cartalk.com/u/EllyEllis)\ **Post date:** [November 24, 2009, 5:32pm UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/13 "2009-11-24T17:32:21Z")
Joe, you are right, I have never saeen a water pump with a plastic impeller. What kind of a “cheepo” car has one? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [November 25, 2009, 12:09am UTC](https://community.cartalk.com/t/1999-no-heat-till-driving/39900/14 "2009-11-25T00:09:47Z")
Cast impellars can also erode, affecting the ability of the pump to move fluid at idle. I’d try the T-stat first, coupled with a good air purging. The function of the T-stat is not to allow the engine to cool, but rather to allow it to heat up. If the engine didn’t need to get to operating temp it would not need a T-stat at all! My money is on the T-stat.