Mortars allow post-installing rebars into pre-existing concrete structures by bonding the steel to the concrete. Post-installed rebars (PIRs) using mortars can offer high mechanical properties at ambient temperatures. However, the mechanical behavior of PIRs, typically governed by the mechanical and physical properties of the mortar, is sensitive to high temperatures. After exposure of PIRs to high temperature, the bond is weakened, and the heat transfer continues during the cooling phase, which endangers the construction after a fire event. This behavior depends on the modification of the PIRs material properties which are temperature dependent. The accuracy of any model-based calculation of the post-fire resistance of such elements depends on the accuracy of the liaison between temperature and the associated material property. Therefore, accurate temperature profiles during the cooling phase are needed to ensure correct calculation of the post-fire behavior of the structure. In order to evaluate the evolution of the load-bearing capacity during fire, (Pinoteau et al. 2013) have developed the bond resistance integration method (Pinoteau's method) to predict the bond resistance variation at different temperatures. Regarding post-fire behavior, design codes do not reproduce the behavior of PIRs during the cooling phase after exposure to high temperatures. This paper presents an experimental study on post-installed rebars using organic mortars in concrete after exposure to high temperatures. Fire tests were conducted under standard ISO 834-1 fire conditions and constant load, then post-fire pull-out tests were performed at different cooling times at lab temperature by increasing the tensile load applied during the heating phase. This experimental study provides a database for future development of post-fire assessment for design of the load-bearing capacity after high temperature exposure. The assessment procedure needs as entry data the thermal calculations during the cooling phase, and the residual bond-strength temperature relationship.